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Review
Look Insight: Health Risks and Benefits of Chickpea (Cicer arietinum) Consumption Rinkesh Kumar Gupta, Kriti Gupta, Akanksha Sharma, Mukul Das, Irfan Ahmad Ansari, and Premendra D. Dwivedi J. Agric. Food Chem., Just Accepted Manuscript • DOI: 10.1021/acs.jafc.6b02629 • Publication Date (Web): 25 Oct 2016 Downloaded from http://pubs.acs.org on October 29, 2016
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Journal of Agricultural and Food Chemistry
Title page:
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Look Insight: Health Risks and Benefits of Chickpea (Cicer arietinum) Consumption
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Rinkesh Kumar Gupta1,2, Kriti Gupta1, Akanksha Sharma1,3, Mukul Das1, Irfan Ahmad
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Ansari2, Premendra D. Dwivedi*
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Affiliation:
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Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute
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of Toxicology Research (CSIR-IITR), Vish Vigyan Bhawan, 31, Mahatma Gandhi Marg,
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Lucknow-226 001, Uttar Pradesh, India.
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Department of Biosciences, Integral University, Kursi Road, Lucknow-226026, India
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Academy of Scientific and Innovative Research (AcSIR), CSIR-IITR campus Lucknow
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*To whom correspondence should be addressed Dr. Premendra D. Dwivedi, Principal Scientist, Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research, Vish Vigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow-226 001, Uttar Pradesh, India. Email:
[email protected];
[email protected] (P. D. Dwivedi) Tel: +91 522 2620107, 2620106, 2616191 Fax No. +91 522 2628227 Running Title: Health effects of chickpea consumption.
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Abstract:
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Chickpeas (CPs) are one of the most commonly consumed legumes especially in the
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Mediterranean area as well as in the western world. Being one of the most nutritional elements of
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the human diet, CP toxicity and allergy have raised health concern. CP may contain various anti-
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nutritional compounds, including protease inhibitors, phytic acid, lectins, oligosaccharides and
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some phenolic compounds that may impair the utilization of the nutrients by people. Also, high
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consumption rate of CPs have enhanced the allergic problems in sensitive individuals as it
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contains many allergens. On the other hand, beneficial health aspects of CPs consumption have
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received attention from researchers, recently. Phytic acid, lectins, sterols, saponins, dietary
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fibers, resistant starch, oligosaccharides, unsaturated fatty acids, amylase inhibitors and certain
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bioactive compounds such as carotenoids and isoflavones have shown the capability of lowering
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the clinical complications associated with various human diseases. The aim of this article is to
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unravel the health risks as well as health promoting aspects of CPs consumption and try to fill
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the gaps that currently exist. The present review also focuses on the various prevention strategies
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to avoid health risks of CPs consumption using simple but promising ways.
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Keywords: Chickpeas; Allergens; Isoflavones; Protease inhibitors; Phenolic compounds
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Introduction
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Health concern caused by legume consumption is a growing subject in the developed as well as
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in developing countries.1 Several reports demonstrating both adverse and beneficial health
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impacts have been attributed to legume intake. Among leguminous foods, chickpea (Cicer
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arietinum L.) also called Garbanzo beans is one of the oldest valuable source of protein and a
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main source of human nutrition. Chickpeas (CPs) produce their offspring from grains and have
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mainly two varieties namely “Kabuli” and “Desi” type. CPs are used in several ways such as
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whole seeds as well as spilt seeds in two that is called “dal” and many other types of traditional,
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fermented, deep fried, sweetened and puffed products, especially in India, Spain and some other
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developing Mediterranean countries. CPs are the world’s third most essential food legume as it is
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currently grown on about 11.5 million hectares (ha) across the world, with a total production of 9
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million tons.2 The energy value produced by Kabuli variety is more (365 kcal/100 g) than Desi
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variety grains (327 kcal/100 g).3 Energy is often measured as gross energy or as a caloric value
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(Kcal/100 g) and refers to the amount of energy contained in a food. The WHO, 2003
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recommends high consumption of low energy containing foods that are rich in non starch
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polysaccharides present in CPs, other vegetables and fruits. Further, beans, lentils and CPs are
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recommended as an important part of a healthy diet for all the Australians as they contain fibre,
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necessary vitamins and minerals. CPs are also a rich source of protein, hence included in the
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meat and fish groups of Australians food.4 According to “Dietary Guidelines for Americans” an
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intake of 3 cups of legumes including CPs in a week is recommended for those who consume
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approx. 2,000 kcal/day energy value.5 The “Mediterranean Diet” has been adopted as a pattern of
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eating in the olive growing areas of the Mediterranean region such as Cyprus, Croatia, Spain,
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Greece, Italy, Morocco, and Portugal. This kind of diet is based on the consumption of food
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products based on plants. The Mediterranean Diet recommend the consumption of legumes more
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than two portions/week to minimize the risk factor and rate of cardiovascular diseases, cancer, as
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well as the incidence of age associated diseases.6 According to United States Department of
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Agriculture, National Nutrient Database, one cup of cooked CPs serves 269 calories, 45 g of
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carbohydrate, 15 g of protein, 13 g of dietary fiber and 4 g of fat. Moreover, dietary consumption
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of six food legumes namely dry beans, chickpea, cowpea, lentils, faba beans and pigeon pea
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comes to about 6.8 kg/year per capita in the world.2
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Despite of immunological and toxicological responses, CPs have several valuable health benefits
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concerning the management of several diseases. This review primarily focuses on beneficial as
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well as deleterious health effects of CPs consumption together at the same platform. This article
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provides an overview of health benefits and possible health troubles coupled with description of
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nutraceutical and toxic components of CPs.
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Potential health benefits caused by nutraceutical components of chickpea
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CPs are excellent food choice due to their health promoting components, including vegetable
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protein, complex carbohydrate, dietary fibres, vitamins, minerals, oligosaccharides, isoflavones,
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phospholipids, antioxidants, hence it is considered as obligatory constituent of a healthy diet
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because its regular consumption has been found to have protective effects against various
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diseases. Recently, several bioactive compounds of CPs have been investigated for their health
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supporting aspects. These compounds included certain antinutritional compounds, phenolic
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compounds including flavonoids, phenolic acids and isoflavones, bioactive peptides with
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antioxidant, anti-cancerous as well as anti-hypertensive property, non digestible carbohydrates
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such as dietary fibers and resistant starch, carotenoids and phytosterols. These compounds have
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been found to be associated with the management of clinical complications associated with
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several diseases such as diabetes, obesity, cancer, osteoporosis and cardiovascular diseases
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(Table 1).
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Chickpeas antioxidants
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Of late, antioxidant property of CPs has been extensively studied due to presence of numerous
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bioactive compounds including peptides and polyphenolic compounds with antioxidative
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potential. Recently, two novel anti-oxidant peptides (P3 and P8) were isolated from enzymatic
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hydrolysis of CPs protein concentrate. The molecular masses of P3 and P8 peptides were 327, 33
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and 402, 49, respectively represented by Asp-His-Gly and Val-Gly-Asp-Ile amino acid
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sequences. The P8 peptide exhibited higher anti-oxidant property than P3 peptide, but its clinical
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relevance is yet to be explored.7 Further, four antioxidant peptides belonging to legumin seed
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protein with the sequences of ALEPDHR, TETWNPNHPEL, FVPH and SAEHGSLH have been
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identified in CPs protein hydrolysate. These purified peptides along with CPs protein hydrolysate
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were studied for their antioxidant activity in CaCo 2 cells. To measure the antioxidant activity,
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cells were exposed with either 0.5 mg/ml dose concentration of CPs protein hydrolysates or 0.3
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mg/ml dose concentration of each peptide fraction and antioxidant potential was measured after
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60 min. As outcomes, within peptide fractions containing TETWNPNHPEL, FVPH and
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SAEHGSLH showed a significant increased cellular antioxidant activity compared to chickpea
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hydrolysate protein, while peptide with ALEPDHR sequence did not show significant
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differences.8 In future, determination of dietary relevance of these purified peptides should be
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taken into consideration.
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Furthermore, phenolic compounds have been recognized as a health promoting factor due to their
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antioxidant property. CPs contain considerable amounts of phenolic compounds and
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anthocyanins with the antioxidant properties that included flavonols, flavone glycosides and
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oligomeric as well as polymeric proanthocyanidins, cinnamic acid, salicylic acid,
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hydroxycinnamic acid, p-coumaric acid, gallic acid, caffeic acid, vanillic acid, ferulic acid, anise
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acid, tannic acid, isoferulic acid, piperonyl and chlorogenic acid.9 Most of these compounds have
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been only tasted for in vitro, cell free assays, however their dietary relevance should be
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determined in future. Another class of phenolic compounds found in CPs are known as
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isoflavones, which have many biological roles such as antioxidant, estrogenic, antifungal, and
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antibacterial activities.10 Several polyphenolic compounds were identified individually and their
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concentration was also determined in a recent study (Table 2A). Among them, concentration of
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syringic acid followed by protocatechuic acid was found to be higher. According to the literature,
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analysis of total phenolic content (TPC) as well as total flavonoids content (TFC) is essential
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aspect as the amount of these compounds is directly proportional to the antioxidative potential of
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any food.11 Therefore, the antioxidant capacity of different CPs varieties varied as TPC and TFC
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are found at different levels in different varieties of seeds. The TPC and TFC of colored CPs
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were found to be higher than cream and beige color seeds. Thus, CPs seeds having a colorful
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coatings exhibit higher levels of antioxidant activity, making it more of a functional food in
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addition to providing dietary proteins.11 The antioxidant capacity of CPs may be influenced by
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the types of domestic processing employed prior to its consumption. During various steps of
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processing, a significant decrease or increase may appear in either polyphenolic content of CPs
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(Table 2B). The level of TPC is found in the range of 203-255 mg/100 g and 101-178 mg/100 g
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for desi and kabuli chickpea varieties, respectively.12 The TPC and TFC content may vary
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depending upon CP varieties, quantitative protocols as well as on growing conditions. In a recent
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study, TPC of native CP was recently reported to have 1.54 mg/g that increased by pressure
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cooking (53%), open pan boiling (64%) and microwave heating (more than 2 fold increase). In
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contrast to TPC, TFC of CP that was 1.47 mg/g got significantly reduced by pressure cooking
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(80%), open pan boiling (84%) and microwave heating (78%). However, impact of sprouting
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and roasting on the TPC and TFC content of native CP were not having any significant
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differences (Table 3).13 It is suggested that soaking at room temperature for 22 h followed by
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steaming for 1 h is the best method for retaining polyphenolic contents of CP.14 Due to biological
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significance, it must be emphasized that bioactive compounds must be retained even after CP
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processing.
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To exert their potent effect on human health, knowledge regarding the bioavailability of these
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phenolic compounds is essential observation that depends upon the release of these compounds
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from food sources. Therefore, more efforts are going on for phenolic compounds from food
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regarding their bioavailability, metabolism as well as mechanistic aspects. Bioaccessible TPC,
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TFC as well as individual phenolic compounds present in CPs are influenced by domestic
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processing as listed in Table 2C. Tables of phenolic profile demonstrate that certain compounds
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such as p-coumaric acid, salicylic acid, t-cinnamic acid do not appear in the detectable range,
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whereas appearances of these compounds occur during the selective heat processing type.
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Studies are needed to investigate the reaction process and participating compounds in the
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formation of these phenolic products during specific processing. Bioaccessibility of phenolic
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compounds present in CP has been found to be lower as CP contains considerable amount of
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these compounds. Therefore, more attention is needed towards the development of new
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processing methods so that the bioavailability of these compounds could be significantly 7 ACS Paragon Plus Environment
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increased. Since, colored CP possess higher antioxidant compounds, future efforts should be
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made to ensure that these can be used for the management and prevention of degenerative
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diseases.
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Management of diabetes and obesity
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People suffering from diabetes must control their glycemic conditions, i.e. their blood glucose
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level. The relative ability of different foods to raise the level of glucose in blood is known as
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“glycemic index” (GI) of corresponding foods. The GI value of any food helps us to choose the
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sources of carbohydrates causing a slow release of glucose after a meal. Among the numerous
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starchy foods, generally beans and pulses have the lowest GI that makes them a suitable source
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of energy for diabetic patient. Such nutrient sources with lower GI may have a crucial role in the
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regulation of glycemic condition and insulin secretion in type 2 diabetic patients. CPs starch is
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more resistant to intestinal digestion due to its extensive polymerization property resulting in
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lower availability of glucose that causes slower entry into bloodstream and reduced demand of
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insulin.15,16 This has been clearly demonstrated in case of diabetic rats as feeding of aqueous and
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methanolic extracts of CP seeds with dose of 400 mg/kg caused significant blood glucose and
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triglyceride levels reduction, respectively.17 Since, antinutritional compounds have toxic effects,
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some of these from CP such as phytic acid, lectins and amylase inhibitors may also impair the
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starch digestion, consequently leading to lower GI in the small intestine (Table 4).18 They
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inactivate the amylase activity following different mechanisms. e.g., on one side PA binds with
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Ca2+ required for the stabilization of amylase activity, while on the other side, it binds with
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starch resulting into its inaccessibility for the digestive enzymes. Apart from impaired starch
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digestion, PA may regulate blood glucose level by delaying in gastric emptying. Similarly,
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lectins also lower blood glucose level as it binds with and disrupt intestinal mucosal cells leading 8 ACS Paragon Plus Environment
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to hindrance in nutrient absorption (Table 4). Sprouted CPs with increased phenolic content have
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shown inhibitory potential against key enzymes namely α-glucosidase and α-amylase associated
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with type-2 diabetes, suggesting that novel health promoting factors may be generated during
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seed metabolism.19 In future, isolation and characterization of such novel compounds and
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metabolomics should be performed. Considering these anti-diabetic effects, CPs may be
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considered as a chief and risk-free source of energy for the diabetic individuals. Also, such
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bioactive compounds from CPs may be used in the development of anti-diabetic products (Figure
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1).
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Obesity is a major health concern for the majority of people around the globe. It is associated
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with the risk for a variety of diseases and health complications. The causal factors for obesity are
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multiple but among them the type and amount of eaten food are most obvious factor. Due to
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healthy nutrients, legumes have beneficial role in the management of body weight. Pulses are
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rich sources of dietary fiber, which is known for the protective role in the development and
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management of obesity.20 High dietary fiber intake has several attributes such as longer eating
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times because of lower energy density of high-fibre foods, delayed gastric emptying,
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consequently sends earlier signs of fullness, earlier satiety due to feeling of gastric and intestinal
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bulking, reduced absorption of nutrients and effects of short-chain fatty acids on hunger and
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satiety. In a human study, effects of two hypocaloric diets (legume-restricted- vs. legume-based
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diet) on metabolic and inflammatory changes, accompanying weight loss has been investigated.
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In this study, thirty obese subjects, 17 men and 13 women were randomly distributed into two
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groups which were assigned to two different calorie-restricted dietary treatments for 8 weeks: a
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legume-restricted diet as a control diet or a legume-based diet with 4 servings/week (1 serving=
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100 gm) of traditional Spanish non-soybeans legumes that included lentils, chickpeas, peas and 9 ACS Paragon Plus Environment
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beans. As outcomes, the L-diet was the only dietary approach inducing a significant reduction in
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body weight, systolic BP measurements, total cholesterol, LDL and HDL concentrations.21 In an
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animal study, increase in the body weight was successfully prevented by CP supplementation of
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high fat diet fed rats. Rats were randomly assigned to 3 groups and diets containing normal fat,
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high fat and high fat supplemented with chickpea were given for 8 months. Addition of 10 %
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(w/w) CPs to the high fat diet reduced the weight gain from 6 months to the end of the
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experiment. In addition, chickpea treatment resulted in 45% decrease in the serum TAG, 23%
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decrease in LDL, 35% rise in HDL and 30% reduction in LDL/HDL compared to the high fat
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diet fed group.22 Therefore, CP based diet may be considered as a healthy food for the
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management of obesity.
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Management of cancer and cardiovascular diseases
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CPs contains numerous bioactive compounds that have shown their anti-cancerous potential
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following different mechanism. The C-25 known as antifungal proteins of CP recently proved as
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a potent anti-mycotic as well as anti-proliferative agent against human oral carcinoma cell line at
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the concentration of 37.5 ߤg/mL by targeting p38ߙ MAP kinase.23 Future in vivo animal studies
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as well as human studies are needed to investigate the stability and tissue specific anti-cancerous
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activity within biological condition. Epidemiological studies have documented a low rate of
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colon cancer in population with higher legume consumption. In this context, a major sterol
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present in CP namely β-sitosterol (0.2% w/v) treatment up to 28 weeks in comparison to 0.9%
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NaCI solution (control group) has been found to reduce chemical induced colon tumor counts in
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rat.24 Further, anti-cancerous potential of CP flour in comparison to soy flour has been
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investigated. In this study, mice with colon cancer induced by a carcinogen azoxymethane were
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fed with 10% (w/w) CP (w/w), 10% (w/w) soy, 10% (w/w) mixed (soy and CP flours) of diet in 10 ACS Paragon Plus Environment
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separate groups for ten weeks. As outcomes, supplementation with 10% CP and 10% soy flours
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had resulted in significant suppression of colonic aberrant crypt formation by 64% and 53%,
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respectively. Combining soybean and CP flour had not shown any additional or synergistic
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efficacy as compared to the administration of individual flours.25 The CP albumin hydrolysate
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exhibit potent anti-tumor activity even after the tumor induction, administration of CP albumin
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hydrolysate by gavage each day for 12 days at different doses of 50, 100, and 200 mg/kg, caused
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significant reduction in tumor volume in mice after the 10th day of the CAH treatment.26
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Considering the above discussed properties, CPs may serve as a functional food for the risk of
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various types of cancer but anti-cancerous potential of these bioactive compounds should be
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investigated at physiological conditions after CP ingestion.
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Similar to cancer, cardiovascular disease (CVD) is another leading cause of mortality in the
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developed and developing countries. In the context of CVD management, split legumes provide
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various health promoting factors. Since, hypercholesterolaemia i.e. high plasma cholesterol level
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is a characteristic of CVD, the impact of dietary fiber on the level of serum cholesterol have
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received tremendous attention. The beans and other pulses, may contribute in lowering of the
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plasma cholesterol level as they are a rich source of dietary fibers. The potent plasma cholesterol
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lowering ability of dietary 10 % (w/w) CPs has been reported. High fat diet (HFD) supplemented
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with CPs for eight months has been found to be induced a favorable plasma lipid profile
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reflecting decreased tri-acyl glycerol (TAG), LDL-cholesterol (LDL-C) and LDL-C:HDL-
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cholesterol levels in comparison to high fat diet fed rats. HFD-fed rats had higher TAG
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concentration in muscle and liver, whereas the combination of CPs to the HFD drastically
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reduced TAG concentration in muscle and liver. Apart from this, activities of lipoprotein lipase
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in epididymal adipose tissue and hepatic TAG lipase in liver recorded a significant decrease of 11 ACS Paragon Plus Environment
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40 and 23 %, respectively in HFD-CP fed compared with those in HFD rats.22 Possible
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protective and therapeutic effects of a diet containing heated chickpea in a dietary induced rat
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model of hypercholesterolemia have been demonstrated. In type II hyperlipoproteinemic rats,
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elevated lipid profiles were improved in the hypercholesterolemic rats receiving legume diets for
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16 days. Moreover, results had confirmed that the chickpea was more effective than the control
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diet containing casein in the normalization of triglycerides as well as total and LDL-cholesterol
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levels in the plasma.27
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Further, saponins have been extensively discussed due to increasing evidence on their hypo-
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cholesteromic effect. CPs contain a considerable amount of saponins content i.e. 297 µg/g
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mainly as saponin B and 2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyranone (DDMP) saponins.
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Certain processing methods such as soaking and peeling of chickpeas have been found to cause
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reduction in the total amount of saponins by 8 %. Subsequently, different cooking conditions
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also significantly reduced the CP saponins content by 47.8%, 46.2%, 49.4%, 17.27% after
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microwaving, frying, frying/microwaving and steaming respectively.28 More recently, the anti-
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hyperlipidemic effect of sprouted CPs was observed in ovariectomy-induced dyslipidemic rats.
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Dietary supplementation with 20% (w/w) germinated CPs reverses the abnormal lipid profile by
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including higher high-density lipoprotein (HDL) cholesterol levels in serum and liver,29
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suggesting that sprouted CPs may offer a better food choice as compared to raw CPs. Therefore,
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dietary CPs may contribute to minimize the risk of CVD, effectively as its hypocholesteromic
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effect has been evident in many in vivo experiments. The above discussed findings provide a
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rational basis for the consumption of CPs as a functional food ingredient, which may be
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beneficial for improving the hypercholesteromia related health complications.
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Hypertension prevention and estrogenic activity
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Hypertension is a hallmark for stroke and other cardiovascular diseases. Among other strategies,
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angiotensin I-converting enzyme (ACE) inhibitors are considered as a preventive agent in
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hypertension.30 The ACE inhibitor peptides are anti-hypertensive in nature because ACE causes
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high blood pressure following conversion of biologically inactive angiotensin I to the activated
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vasoconstrictor angiotensin II and also inhibits the vasodilator bradykinin (Figure 2).31 CPs may
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have crucial role in controlling hypertension as CP proteins are a good source of bioactive
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peptides with inhibitory potential for ACE. In a previous study, four ACE inhibitory peptides
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with molecular weight of 900 Da and IC50 0.1 mg/ml of each were identified in the CPs protein
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hydrolysates after enzymatic hydrolysis. Among them, two peptides were found to be inhibited
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competitively, whereas the other two were uncompetitive inhibitors of ACE (Answer will be
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given).32 Peptides having higher amino acid residue number are more efficient for ACE
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inhibition. In another study, protein/peptide profiles of CPs have also been shown to have a rich
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composition of the small peptides under the molecular weight of 4 kDa in the protein
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hydrolysates. The protein hydrolysate obtained from chickpea desi verities has been shown
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higher ACE inhibition with the IC50 of 140 ± 1 µg/ml compared to its digests generated by
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alcalase/flavourzyme having IC50 of 228 ± 3 µg/ml or papain with the IC50 of 180 ± 1 µg/ml
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and to CP kabuli type hydrolyzed by gastrointestinal digestion (IC50 of 229 ± 1 µg/ml).33 In
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addition to peptide, certain phenolic compounds present in CPs have been suggested as a
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potential candidate for the ACE inhibition. Recently, CP phenolic extracts represented by ferulic
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acid, p-hydroxybenzoic, protocatechuic, caffeic, chlorogenic and p-coumaric acids, have shown
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a significant and dose-dependent inhibition of ACE-I. CPs phenolic extract at 40 µg/ml
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concentrations has been shown to inhibit ACE by 33.2%.34 These bioactive compounds may have 13 ACS Paragon Plus Environment
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a significant contribution towards the ACE-I enzyme inactivation but their individual potency
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regarding this is yet to be explored. It must be mentioned here that for peptides to be effective
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ACE inhibitors, they must escape digestion and enter the circulatory system prior to entering the
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target cells. Considering this point, further investigations to assess in vivo and clinical
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antihypertensive potential will be required steps to confirm the discussed findings. In addition,
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more studies are needed to investigate the optimal conditions required for the production of such
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promising ACE inhibiting bioactive compounds.
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Phytoestrogens, a class of chemicals produced by a variety of plants estrogenic isoflavons such
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as formononetin, biochanin A, genistein and daidzein are currently heralded as offering
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alternative potential therapeutic agent for serious diseases. For instance, genistein and daidzein
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both have been found effective in the management of diabetes by acting on peroxisome
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proliferator-activated receptors and reduces the risk of coronary heart disease by reducing the
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level of low-density lipoprotein and triglycerides. Genistein is the potential compound found
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effective in the treatment of cancer by acting on androgen receptor further to inhibit tyrosine
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kinases.35 Sprouted CPs contain variable amounts of isoflavones such as formononetin, biochanin
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A and genistein and their contents may increase by the treatment of light. The CP contents of
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formononetin and biochanin A under light exposure were found to be 154 and 130 times higher,
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respectively, than in untreated CP seeds. CP sprouts germinated under the light condition exhibit
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higher amount of isoflavone as compared to other growing conditions.36 CPs isoflavones are of
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great interest because sprouted CPs are considered as a healthy diet for human consumption,
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globally. CPs encompass two main estrogenic components of isoflavones namely, formononetin
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(0.10 ± 0.01 mg/10 g) and biochanin A (0.18 ± 0.02 mg/10 g).31 Recently, sprouted CP seeds
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have been shown in estrogenic activities i.e. having an action similar to that of an estrogen. The 14 ACS Paragon Plus Environment
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estrogenic as well as anti-osteoporotic activity of CPs isoflavones has been investigated out in
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ovariectomized rats. Treatments of ovariectomized rats with sprouted CPs doses of 50 and 100
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mg/kg/day upto five weeks reflected a significant estrogenic impact on the uteruses, including
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the increased uterine weight, epithelial height and gland number as well as in the expression of
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the cell proliferation marker PCNA. The treatments had also improved the secretory profile of
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ovarian hormones and pituitary gonadotropins. For instance, serum 17β-estradiol level was
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significantly increased, while serum levels of follicle stimulating and luteinizing hormones were
330
found to be decreased in comparison to ovariectomized rats. In addition, the treatment had
331
significantly attenuated the bone loss and caused an increase in the bone mineral density, bone
332
volume/tissue volume and trabecular thickness.37 In another study, doses of 500 or 1000 mg/kg
333
body weight/day CP extract upto ten weeks have been found to prevent bone loss and
334
osteoporosis
335
RANK/RANKL/OPG system in ovariectomized rats.31 In conclusion, CP isoflavones may be
336
potentially used for the treatment of menopausal symptoms and osteoporosis caused by estrogen
337
deficiency.
338
Toxic components causing adverse health effects
339
Like many other legumes, CP contains variety of toxic substances causing deleterious
340
consequences to the human digestive system. Majority of legume plants, including CPs have the
341
ability to synthesize certain biologically active substances, considered as anti-nutritional
342
compounds. The most widely recognized anti-nutritional compounds from CPs are the protease
343
inhibitors, amylase inhibitors, phytolectins, oligosaccharides, phenolic compounds and
344
other compounds in traces (Figure 3, Table 4).38 Large intake of anti-nutritional compounds
345
causes mild to severe deleterious health effects by impairing the digestion process in human and
by
promoting
the
osteoblast
differentiation
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regulation
of
few
Journal of Agricultural and Food Chemistry
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346
animals. Therefore, the amount of anti-nutritional compounds determines the nutritional quality
347
of CPs.
348
followed by adequate processing, despite certain anti-nutritional compounds may also have
349
beneficial effects on human health (Table 5). Therefore, re-evaluation of nomenclature and
350
important role of these biological compounds should be taken into consideration.
351
Protease Inhibitors (PI)
352
In recent years, several reports are listed on the occurrence, physiological function, mechanism
353
of action, and characterization of protease inhibitors derived from leguminous plants. Trypsin
354
and chymotrypsin inhibitors are widely recognized form of protease inhibitors found in different
355
varieties of CPs.39 Among different CPs varieties, “Desi” and “Kabuli” varieties contain higher
356
amount of trypsin and chymotrypsin inhibitors.40 The protease inhibitors are well defined for
357
their ability to inhibit the proteolytic enzymes that may result in impaired protein digestion. The
358
adverse health effects of protease inhibitors have been observed primarily in animal models.
359
Protease inhibitors have been found to be associated with reduced body growth and pancreatic
360
hypertrophy.41 These complications occur due to the negative feedback mechanism instead of
361
reduced protein digestibility that takes place in the intestine.42 The inactivation of trypsin and its
362
scarcity may happen in the small intestine due to the presence of protease inhibitors.
363
Subsequently, stimulation of intestinal mucosa leads to secretion of cholecystokinin hormone
364
which in turn triggers the pancreas to synthesize more trypsin. Large amounts of sulfur
365
containing amino acids are required for more trypsin synthesis as trypsin is rich in sulfur
366
containing amino acids. Therefore, other body tissue metabolism having involvement of sulfur
367
containing amino acid get affected, which in turn, can contribute to the loss of body weight.
368
Simultaneously, the stress on the pancreas caused by this unusual trend leads to the hypertrophy
Although, in legumes anti-nutritional compounds play contrary health responses
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369
and hyperplasia like pathological changes in pancreatic acinar cells, which may further lead to
370
the formation of adenomatous nodules.43
371
To combat the pancreatic hypertrophy and body loss, the elimination or inactivation of PIs is
372
required, which in turn improve the nutritional quality of CPs. The heat-labile nature of legume
373
PIs has been well known and trypsin inhibitor was found to be more vulnerable to heat than
374
cymotrypsin inhibitors.44 To achieve this task, soaking and heat treatments have been found to
375
enhance the nutritional value of several legumes including CPs. Soaking followed by dry heat
376
treatment removes trypsin inhibitor by partial or complete solublization, resulting in removal of
377
trypsin inhibitor with a discarded soaking solution.45 On the other hand, heat treatment
378
frequently inactivates the trypsin inhibitor and volatile substances in CP seeds. Trypsin inhibitors
379
of CP get inhibited by moist heat at 121 °C for 30 minutes or boiling at 100 °C but not by dry
380
heat.46 In addition to these, many other processing methods, including fermentation, autoclaving
381
and germination have been reported to significantly decrease the PI activities in CPs. The water
382
soaking treatments caused significant decrease (approx 14%) in trypsin inhibitor contents in
383
cultivar ICCV10 whereas cooking for 90 sec was able to completely inactivate the trypsin
384
inhibitor. However, germination for 72 hours caused the maximum reduction of trypsin inhibitor
385
to 83.6% in JG74 cultivar. 47 Depending on the present knowledge, it may be concluded that the
386
combination of moist heat treatment and autoclaving may be used as pivotal tools to reduce the
387
amount of PIs, more efficiently.
388
Saponins exert their toxicity by lowering the nutrient availability and decreasing the digestive
389
enzymatic activity that results in inhibition of body growth in animals.48 Tannins are phenolic
390
compounds that reduce the protein digestibility either by formation of less digestible dietary
391
protein complex or inhibition of digestive enzyme.49 CPs contain considerable amount of 17 ACS Paragon Plus Environment
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392
saponins (1–5.6 g/100 g) and tannins (0.68 mg/g) of seed dry weight. Chickpea contains mainly
393
βg saponin (a 2,3-dihydro-2,5-dihydroxy-6-methyl-4H-pyran-4-one type) and lower amounts of
394
Bb and Be saponins.50 As tannin content, “C- and O-glycosidic derivatives of gallic acid (3,4,5-
395
trihydroxybenzoic acid) has been found in the chickpeas. Tannin content can be reduced by some
396
domestic processing such as roasting (62%) and pressure cooking (more than 2 fold), whereas
397
open pan boiling and microwave heating increase total tannins quantity up to more than 3 fold.13
398
Therefore, processing of CPs should be done before consumption to neutralize these ANCs.
399
Amylase inhibitors (AI)
400
The pancreatic alpha amylase inhibitors have received considerable attention from biochemists
401
and nutritionists ever since their presence was revealed in several legumes, including CPs.
402
However, α-amylase inhibitor activity was lower in CPs compared to other commonly consumed
403
legumes.51 Desi varieties of CPs were found to possess higher amylase inhibitory action than
404
Kabuli varieties when activity was measured in the pancreatic and human salivary amylases.52
405
CP cultivars have been found to have significant variation in the amount of amylase inhibitors
406
(AIs) as it ranged between 11.6-81.4 g/unit in different varieties and also observed that
407
pancreatic amylase was more prone to inhibition as compared to salivary amylase.53 The α-
408
amylase inhibitor may exhibit some adverse effects on mammalian nutrition. The AIs inactivate
409
the amylase by forming an inhibitory complex with the amylase enzyme depending upon pH,
410
ionic strength, temperature, binding duration and inhibitor concentration. Thus, AIs impair the
411
starch digestion and cause reduction in body growth.54
412
Similar to other proteinaceous ANCs, heat-labile nature of CP-AIs are also well-known. The
413
activity of CP-AIs was totally diminished after 10 min boiling of CPs extract.55 Since CP are
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Journal of Agricultural and Food Chemistry
414
usually consumed after boiling, therefore practical consequences on starch digestibility do not
415
occur until raw seeds are consumed.
416
Phytolectins and oligosaccharides
417
Phytolectins are a structurally diverse class of sugar binding glyco-proteins found in many
418
leguminous foods. Lectins from legume are known to interact with glycoprotein on the surface of
419
erythrocytes leading to hemagglutination of all human blood types (A, B, AB and O) causing
420
hemolysis and death in rare cases. In seeds, lectins are thought to evolve as storage proteins and
421
have a defensive role in plants, whereas their biological roles are yet to be elucidated. The
422
hemagglutination activity of phytolectin is influenced by several factors such as its molecular
423
property, cell surface property, metabolomics of the cells, cultivar, growing area and collection
424
methods.56,57 Purification and characterization of legume lectins from CPs have been reported
425
earlier.58 The pa2, consisting of two subunits of 23 kDa each, is one of the most abundant lectins
426
found in CPs.59 Hemagglutination activity of CPs lectins is much lower than lentils and peas
427
lectins. Recently, a lectin belonging to plant albumin family has been structurally determined and
428
demonstrated hemagglutination activity in rabbit RBCs.60 Apart from hemagglutination, oral
429
ingestion of lectins cause a decrease in the villi surface area by shielding of brush border
430
membranes in the intestine which renders the gastric secretion required for nutrient absorption as
431
a result. This may cause a pathological condition in the intestine as continuous secretion of
432
gastric enzymes may cause adverse health effects like gastric ulcers. In livestock, feeding of raw
433
pulse seeds impairs the body growth and performance probably due to lectin’s binding affinity to
434
intestinal mucosal cells, leading to altered blood glucose homeostasis.61 Since, there is a risk of
435
food poisoning from consuming unprocessed or less processed pulses, optimization in processing
436
methods should be considered to minimize the risk factor. The lectins are highly sensitive to heat 19 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
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437
treatment as they can be completely destroyed after moist heat treatments at 100 °C.62 Dry heat
438
may not completely destroy lectins as some activity still remains even after 18 hours of dry heat
439
treatment at 100 °C. Therefore, it must be emphasized that moist heat treatment should be given
440
to these legumes including CPs prior to consumption.
441
The oligosaccharides belong to raffinose sugar family include stachyose, raffinose and
442
verbascose, causing flatulence in organism. The two sugars stachyose and raffinose together
443
constitute about 37% of the total soluble sugars in CPs.40 Usually, digestive enzymes for these
444
sugars are not found in the human gut therefore, these sugars are decomposed by bacterial
445
fermentation, resulting in production of large amounts of carbon dioxide, hydrogen and lesser
446
amounts of methane gas. Despite their demonstrated health benefits, consumption of pulses in
447
Western countries has traditionally been low. This is, in part, due to the perception that pulses
448
cause flatulence and gastrointestinal upset with the symptoms of abdominal uncomfort and
449
bowel movement. A randomized, double-blind placebo-controlled, cross-over study assessed the
450
impact of 28 consecutive days consumption of 100 g dry weight Kabuli chickpeas, green Laird
451
lentils, and green peas, in comparison to a potato control, on perceived flatulence, abdominal
452
comfort, bowel movements and overall gastrointestinal function in 21 healthy male individuals
453
aged between 19–40. During the treatment period, outcomes revealed minor changes in
454
occurrence and/or severity of flatulence and abdominal discomfort, but no changes in overall
455
gastrointestinal function. Therefore, pulses containing oligosaccharides are well tolerated with
456
negligible perceived changes in flatulence and overall gastrointestinal function when
457
incorporated into the diet of healthy adult males.63 But, large amount of CPs intake may cause
458
abdominal discomfort and gastrointestinal disturbance.
459 20 ACS Paragon Plus Environment
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460
Chickpea allergy
461
The incidences of CPs allergy have been reported at different time points from various countries
462
of the world due to global consumption.1 In the few studies carried out by our group, the
463
prevalence of CPs allergy in Indian scenario was found to be higher as compared to other
464
commonly consumed legumes.64,65 CP allergy has been found to be more prevalent (13.2%);
465
followed by green gram (11.8%), egg white (9.2%), red gram/ bean fresh (7.9% each) and bengal
466
gram/ milk/ mustard leaves (6.6% each). The risk due to CPs allergy may get magnified due to
467
cross reactivity of CPs allergens to other legume allergens as some of them share same epitopes
468
or similar sequences and/or structural features.66 CPs cross reactivity with other legumes like
469
peanut, red kidney beans, soybeans and black gram has been reported in our previous studies.64
470
CPs and lentils are the most frequent cause of allergy to legumes in Spanish children that may be
471
explained by exhibited cross reactivity to each other.67 Thus, CPs have the ability to induce
472
allergic symptoms in those susceptible individuals who may be sensitized to other cross reactive
473
legumes. Therefore, the susceptible individuals should be aware of cross reactivities and must
474
take care of all possible routes of exposure.
475
Chickpea allergens
476
The allergic potential of CPs provoked by its allergenic proteins has been well established in
477
humans as well as murine model. In addition to non-allergic proteins, CPs also contain several
478
proteins having IgE binding property that induce the allergic manifestation in sensitive
479
individuals64 and are considered major CPs allergens. CPs allergens belong to the Class 1 food
480
allergens.1 Food allergens of this category have been found to remain undigested in gastric fluid
481
that may lead to sensitization of susceptible individuals. Moreover, seven potent cross-reactive
21 ACS Paragon Plus Environment
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482
CP allergens have been identified using in silico approach. The identification of these allergenic
483
proteins was carried out on the basis of sequence similarity, structure and physicochemical
484
properties with the known legume allergens. The cross reactivity occurs in four allergens among
485
seven because these four had common sequence as well as structural similarity, with the known
486
allergens.66 The in vitro pepsin digestibility assay of CP proteins revealed that seven proteins of
487
molecular weight approximately 95, 70, 55, 45, 35, 26 and 20 kDa were resistant to digestion in
488
the simulated gastric fluid.64 Thus, these stable proteins may have the potential to elicit allergenic
489
response, independently. Further, immunological characterization of above mentioned proteins
490
using IgE binding property as a tool, was also carried out with sera of humans as well as mice
491
sensitized with CPs.64 CP allergens are derived from two allergenic polypeptides belonging to
492
the family of 2S albumin and 11S globulin seed storage protein.1 The 2S albumin belongs to
493
prolamin superfamily of allergens, whereas 11S globulin belongs to cupin superfamily of
494
allergens. Among them, 2S and Pa2 albumin of CPs were found to provoke the allergic
495
responses in CPs-sensitive individuals.59 Recently, vicilin (50 kDa) and the basic subunit of
496
legumin (20 kDa) were reported as putative CP allergens.68 The purification, characterization and
497
allergenicity assessment of 26 kDa CPs allergen have been carried out69 independently that may
498
be useful for further allergen specific immune therapy treatment. This will also help us to
499
determine the proportion of allergy caused by individual allergen in comparison to crude protein.
500
Therefore, allergenicity assessment of the purified CP allergens is also an important aspect to
501
identify the potential allergy elicitors in CPs. To remove the effector activity of CP allergens,
502
accurate IgE binding sequence (epitope) should be further characterized.
503
Mechanistic aspects of allergy and anaphylaxis caused by chickpea allergens
22 ACS Paragon Plus Environment
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Journal of Agricultural and Food Chemistry
504
The detailed mechanistic aspects of IgE mediated CP allergy have been explained by a study
505
done by our group.64,69 The IgE mediated reactions
506
hypersensitivity because their consequences appear in less than a minute to hours after the
507
ingestion of allergic foods in susceptible individuals. However, non IgE mediated allergic
508
reactions an outcome of either IgE/IgG mediated allergic reaction or immune complex mediated
509
responses. The allergic reactions and anaphylactic symptoms induced by CP allergens are found
510
to be associated with IgE and IgG antibodies, suggesting that the allergic symptoms appear via
511
IgE as well as IgG mediated allergic reaction.64
512
Like many other food allergens, exposure to 100 µg CP crude protein extract also induce mixed
513
cytokine (Th1/Th2) response in the spleen as higher levels of Th1 and Th2 cytokines (IL-4, IL-6,
514
IL-10, TNF-α and IFN-γ) as well as IL-17 have been found in splenocyte supernatant.64 These
515
inflammatory cytokines may trigger and aggravate the CP allergy and inflammatory responses.
516
The Th2 cytokines produced by CP allergens and some co-stimulatory factors cause class
517
switching to IgE, resulting in more CP allergen specific IgE production. Further, specific IgE
518
bound to the FcεR1 receptor of mast cells or basophiles is termed as sensitization phase. During
519
this phase no allergic symptoms occur. Furthermore, secondary exposure to CP allergens induces
520
cross-linking of IgE bound to mast cells/basophils and results in the release of various chemical
521
mediators such as histamine, mouse mast cell protease (MMCP-1), hexosaminidase, leukotrienes
522
and prostaglandin D2. Recently, Src kinases have been found to be involved in the mast cell
523
activation and degranulation via a signaling cascade triggered by CPs allergen (Figure 4).69
524
These allergic mediators are responsible for onset of allergic and sometimes anaphylactic
525
reactions in the body. CPs allergens exposure also stimulate the production of a chemokine
526
termed as chemokine (C-C motif) ligand-2 (CCL2), which recruits monocytes, memory T cells
are also termed as immediate type
23 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
Page 24 of 69
527
and dendritic cells to increase the inflammatory pathogenesis. On the other hand, CPs allergen
528
may also cause eosinophil mediated allergic reactions at various targeted tissues such as intestine
529
and lungs. Thus, CP allergens have potential to elicit the allergic responses using
530
multidimensional mechanism. Till date, studies on the mechanistic aspects of CPs allergy are
531
limited to mast cells and therefore the role of other immune cells including dendritic cells and
532
macrophages causing pathology of CP allergy need to be investigated.
533
Prevention for chickpea allergy associated clinical complications
534
Thermal processing
535
Considering the huge consumption of CPs, more emphasis should be given to the type of
536
processing methods employed that are safer for culinary options. The heat treatment is a pivotal
537
tool for the prevention of adverse health effects caused by allergic components of most of the
538
legumes. It must be mentioned here that most of the allergens are heat resistant, water soluble,
539
resistant to pH and proteases. The uniqueness of allergen such as resistance to gastric digestion,
540
solubility and the permeability of intact protein across the intestinal mucosa may be amended by
541
the applied processing methods.70
542
Multiple immuno-reactive proteins of CP have been reported to retain the same extent of
543
immuno-reactivity even after cooking or boiling. No effect occurs upon 30 min. of boiling on
544
immuno-reactivity of CPs protein, though 60 min. boiling reduced the immuno-reactivity of
545
certain proteins. On the other hand, the impact of autoclaving on CP significantly reduced the
546
number of allergenic proteins. The efficiency of autoclaving regarding the allergenicity
547
attenuation depends upon autoclaving duration as well as extent of applied pressure. An increase
548
in time and applied pressure simultaneously was found to be positively related to the reducing 24 ACS Paragon Plus Environment
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Journal of Agricultural and Food Chemistry
549
number of allergenic proteins. Autoclaving for 15 min at 1.2 atm pressure significantly reduced
550
the number of CP allergens, while only few immuno-reactive proteins remain stable even after
551
autoclaving at 2.6 atm for 15 min. If autoclaving time was further increased up to 30 min, it
552
almost degraded the immuno-reactive proteins except only two proteins.71 Therefore, it may be
553
inferred that autoclaving of CPs may reduce the allergenicity, effectively. However, what will be
554
the effect of such harsh conditions on taste of autoclaved CP protein is a matter of further
555
studies.
556
Instant Controlled Pressure Drop Treatment
557
Legumes are the most frequent element of human diet because of their nutritional quality and
558
protein rich content although many legumes are considered a risk factor for toxic and
559
immunogenic responses. Similar to other processing methods, the instant controlled pressure
560
drop (DIC) treatment is considered a preventive tool for reducing the toxic as well as allergic
561
potential of several allergenic foods. The DIC treatment, a food processing method is based on
562
combination of heat and steam pressure treatment. Legume allergies from peanut, lentils and
563
soybeans have been found to be reduced in extent of immuno-reactivity after the DIC treatment
564
DIC treatment at different pressure and time conditions (3-6 bar for 1-3 min).72 In case of CP,
565
DIC treatment was found to be an alternative option to autoclaving for diminishing in vitro IgE
566
binding property. It should be kept in mind that DIC treatment does not affect the total protein
567
content of legume seeds.
568
The Maillard Reaction
569
The Maillard reaction (MR) is a non-enzymatic reaction that takes place between reducing sugar
570
and compounds with a free amino group during thermal processing or long storage of foods. The 25 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
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571
impact of MR has been found to be very vague in food allergy as reviewed by Gupta et al.,
572
(2016).73 The MR significantly affects the allergic potential of foods either by
573
inactivation/destruction of epitopes or through generation of new epitopes as well as making
574
cryptic epitopes more accessible. Several studies have revealed that MR induced glycation of
575
legume allergens may reduce its allergenicity in the terms of in vitro IgE binding property.
576
However, some recent studies demonstrate that glycation of food allergens with various reducing
577
sugars attenuates the in vivo allergic responses. Allergenic potential of several purified potent
578
food allergens, including Ara h2/h6, ovalbumin, egg white and β-conglycin allergens have been
579
found to be reduced or inhibited, after glycation.73 For instance, Native Ara h 2/6 (4 mg/ml) in
580
32.5 mM phosphate buffer containing 100 mM NaCl, was heated for 15 min to 110 0C in the
581
presence of 100 mM glucose and found that for most patients this glycation reaction reduced the
582
IgE reactivity of Ara h 2/6 still further compared with thermal treatment alone, and is consistent
583
with the fact that IC50 values for glycated-Ara h 2/6 were 1.3 to 73-fold higher than that of
584
native-Ara h 2/6 (n = 30).74 Further, antigenicity of β-conglycin has been found to be
585
significantly reduced when this allergen was glycated with glucose as compared to dextran,
586
dextran, maltose, lactose, glucose or galactose mixtures (weight ratio 1:1). This reaction was
587
achieved with the incubation at 60 °C and 79 % relative humidity.75 In case of OVA allergen,
588
mannose and glucomannan as glycating agents (condition; 55 0C for 72 h at a 65% relative
589
humidity) have been found to be effective in the suppression of allergic immune responses in the
590
terms of reduced serum levels of MMCP, specific IgG1 and IgG2a.76 Considering these studies,
591
MR may alter the allergenicity of CP allergens also, which calls for investigations.
592 593 26 ACS Paragon Plus Environment
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Journal of Agricultural and Food Chemistry
594
Genetic engineering
595
Elimination of allergic proteins by genetic engineering would be economical and potential
596
alternatives to combat the CP allergy. Genetic engineering may offer a potential alternative to deal
597
with allergens as found in many leguminous as well as non-leguminous foods. Genetic engineering
598
also referred as genetic modification is an advancement from conventional plant breeding because it
599
increases the accuracy of gene transfer, and the time to yield the desirable plant is reduced. The
600
major problems with conventional plant breeding are it being less controlled, more random, and
601
simultaneous transfer of several undesirable genes. Recently, site directed mutagenesis and RNA
602
interference (RNAi) techniques have shown their major contribution for the development of a safe
603
delivery method. CRISPR-Cas9 is widely used to produce hypoallergenic foods with reduced
604
allergenicity. We can modify the immuno-dominant epitopes of CP allergens using site directed
605
mutagenesis methods that may result in attenuation of allergic potential of particular CPs allergens.
606
Several studies have demonstrated the potency of this method regarding production of
607
“hypoallergens”. Two of the five IgE binding epitopes of soya allergen (Gly m Bd 30K) could be
608
transformed into non- IgE binding epitopes by single-site amino acid substitutions.77 Hypoallergenic
609
mutants of Ole e 1, the major olive pollen allergen has been produced by one point (Y141A) and two
610
deletions (135 and 140) caused by site-directed mutagenesis.78 Among these, deletion at 135 deletion
611
mutant showed the strongest reduction in the IgE-binding capability of sera from olive pollen-allergic
612
patients. On the other hand, silencing of genes of interest by RNA interference technique may also be
613
a promising strategy for the management of CP allergy. Hypoallergenic CPs can be generated by
614
RNAi technology as expressions of major allergens Mal d 1, Mal d 2 and Mal d 3 were successfully
615
reduced by RNA interference, result in production of hypoallergenic apples.79 In a study carried out
616
by Dodo et al., (2008), it was observed that silencing of the immuno-dominant allergen Ara h 2 leads
617
to its significant reduction and a decrease in peanut allergenicity 80 hence, indicating the possibility of
27 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
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618
alleviating CP allergy using the RNAi technology. Moreover, it is possible to dramatically reduce the
619
level of specific allergenic proteins in CP by introducing copies of the same gene but in the antisense
620
orientation. For example, the gene encoding the 16 kDa allergen of rice inserted in the antisense
621
orientation significantly reduced levels of 16 kDa protein.81
622 623
Protein Hydrolysis
624
Protein hydrolysis may be employed to reduce the antigenicity and allergenicity.. Allergic
625
reactions caused by certain amino acids sequences may be eliminated using appropriate
626
proteases, resulting into the reduced antigenicity. Hydrolysis of protein causes modification in
627
allergenic peptides so that the altered peptides could not bind with IgE, thereby inhibiting the
628
further sensitization resulting in disappearance of allergic reactions. Protein hydrolysis can be
629
performed either by heating with acid or by addition of proteolytic enzymes. Acid hydrolysis
630
may lead to specific modification in certain amino acid residues i.e. oxidation of
631
cysteine/methionine, destruction of serine/ threonine and conversion of glutamine and asparagine
632
to glutamate and aspartate, respectively. These alterations in important amino acids may reduce
633
the nutrional value of food proteins significantly. Therefore, enzymatic hydrolysis should be
634
preferred over acid hydrolysis to reduce the allergenicity. Enzymatic treatment in combination
635
with heat treatment and ultrafiltration, are considered to be more effective in obtaining suitable
636
protein products for human nutrition with reduced risk of allergenicity.82 Several milk-based
637
hypoallergenic ingredients are manufactured by enzymatic hydrolysis that can be further
638
improved by addition of high pressure treatment. Enzymatic hydrolysis under high hydrostatic
639
pressure of beta-lactoglobulin, was found to reduce the affinity of beta-lactoglobulin to human
640
IgE.83 Further, reduced allergenicity of soybean 2S protein (Kunitz trypsin inhibitor) has been 28 ACS Paragon Plus Environment
Page 29 of 69
Journal of Agricultural and Food Chemistry
641
achieved by partial digestion by peptic hydrolysis for 90 min.84 In a recent study, enzymatic
642
hydrolysis through alcalase and flavourzyme has been found to be effective in attenuating
643
allergenicity of kidney beans, black gram and peanut proteins.85 Furthermore, chickpea protein
644
isolate has been also used for the production of hypoallergenic protein hydrolysates. Most
645
effective reduction in the antigenicity of extensive hydrolyzed chickpea 11S proteins has been
646
observed by sequential treatment with endo- and exopeptidases.86 Such type of specific protease
647
treatment may be employed to produce chickpea protein hydrolysate that could be useful for the
648
elaboration of specialized hypoallergenic food products.
649
Conclusively, CP has several beneficial and few deleterious health effects in humans. CP
650
induced adverse health outcomes are due to the presence of many antinutrients compounds such
651
as protease and amylase inhibitors, phytolectins, phytic acid, some oligosaccharides belonging to
652
raffinose sugar family and few allergens. These toxic and immunogenic components have been
653
shown to be efficiently neutralized by various processing methods employed such as thermal
654
treatment, autoclaving and DIC treatment. In our opinion, approximately 100 g of CPs
655
containing 4 g of amylase inhibitors may be included in the modern diet of diabetic as well as
656
obese individuals. More than 4 g of amylase inhibitors may cause abdominal discomfort and
657
diarrhea. Similarly, particular amount of CP per day containing 3 g of trypsin inhibitor may be
658
included in the modern diet to minimize the risk of cancer but one should also check the toxicity
659
of this particular type of lectin dose in healthy individuals. Considering the existing facts, CPs
660
possesses various components that are studied in animal models for their antinutritional as well
661
as nutritional property. However, more clinical trials of chickpea’s individual components are
662
needed for their toxicity as well as therapeutic potential, so that these me be used in the modern
663
diet to minimize the risk of several diseases. Preservation of these nutraceutical components in 29 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
Page 30 of 69
664
the processed CP has been a big challenge just prior to consumption. Therefore, more attention is
665
needed towards the development of processing methods to retain the bioactive compounds with
666
their biological property, while destroying the harmful antinutrients at the same time.
667
Acknowledgments
668
We are grateful to Professor Alok Dhawan, the Director of the Institute for his keen interest in
669
this study. This work was financially supported by In-Depth Network Project (BSC-0111) of
670
Council of Scientific and Industrial Research (CSIR) and GAP-315 of Indian Council Medical
671
Research, New Delhi. KG and AS are thankful to DST and CSIR, New Delhi for the award of
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their Women Scientist (WoS) and Senior Research Fellowships. These authors have stated that
673
there is no conflict of interest.
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(116) Han, L. K.; Sumiyoshi, M.; Zhang, J.; Liu, M. X.; Zhang, X. F.; Zheng, Y. N.; Okuda, H.;
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Journal of Agricultural and Food Chemistry
992
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(117) Gandhi, G. R.; Ignacimuthu, S.; Paulraj, M. G. Solanum torvum Swartz. fruit containing
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diabetic rats. Food Chem Toxicol. 2011, 49(11), 2725-33.
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(118) Mallery, S. R.; Zwick, J. C.; Pei, P.; Tong, M.; Larsen, P. E.; Shumway, B. S.; Lu, B.;
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Fields, H. W.; Mumper, R. J.; Stoner, G. D. Topical Application of a Bioadhesive Black
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Premalignant Oral Lesions. Cancer Res, 2008, 68(12), 4945-57.
1001 1002 1003 1004
47 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
Figure caption: Figure 1 Possible mechanism of blood glucose homeostasis regulated by phytolectins, phytates and amylase inhibitors that have crucial roles in diabetes management. Figure 2 The Antihypertensive potential of bioactive peptides and isoflavones with estrogenic activity presents in CP. Figure 3 Clinical complications caused by ANCs and allergens of CP. Figure 4 Possible mechanism of allergy and anaphylaxis induced by CP allergens. Figure 5 Table of Content (TOC): Graphical figure summarizing the health risk and benefits associated with chickpea consumption. 1005
48 ACS Paragon Plus Environment
Page 48 of 69
Page 49 of 69
Journal of Agricultural and Food Chemistry
1006 1007 1008 1009 1010 1011
1012 1013 1014 1015 1016
Table 1: Anti-obesity, anti-diabetic and anti-cancerous effects of neutraceuticals found in chick
1017
pea 49 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
S. No.
Neutraceutica
Amount
l Compound
in chick
Experimental Settings
Anti-obesity
Experimental
outcomes
Settings
Page 50 of 69
Anti-diabetic outcomes
Experimental
Anti-cancerous
Settings
Outcomes
pea 1.
Dietary fibres
17.4g/10
24 female adult Wistar
Dietary germinated
Eight
diabetic
Glucose levels of 6.3±2-4
1429 participants who
High
0g
rats were divided into
chickpea normalized
patients were given
mmol/1 after diet B were
had had one or more
intervention resulted
four
the lipid profile in
diet A (normal Italian
significantly lower than
colorectal adenoma(s)
into
Group I - Control; Group
serum
diet) for 10 days, diet
those either after diet A
3
chemoprevention.101
II
High-density
B (diet A + three to
(9.9±3.1 mmol/l) or after
identified
fourfold
increased
diet C (8.7±3.4 mmol/l).
removed were given a
groups
-
that
is,
Ovariectomized
and
liver.
mm
or
larger
lipoprotein
(HDL)
OVX
cholesterol,
body
fibres) for next 10
Daily glucose (average
high (13.5 g/day) or
uterine,
days and diet C (low
of the
low (2 g/day) placebo
spleen
carbohydrate diabetic
different times of the day)
were
diet) for another next
was
10 days.15
after diet B, and 8.2±2.3
germinated
chickpea sprouts (20% in
weight,
diet) and Group IV OVX
heart,
+ atorvastatin (1.2 mg/kg
weights
b.wt, p.o.).29
increased that were reduced
and
due
to
five values at
cancer
fibre intervention.101
3.8±2.3 3 mmol/1
mmol/1
ovariectomy.29
colon
and
(OVX) rats; Group III +
fibre
and
7.3±1.1
mmol/l, respectively, after diets A and C.15
2.
Fatty acids
62–67%
Male Wistar rats were
There
no
Seventeen subjects (6
Insulin
fed
high-fat diets
difference in body
with type II diabetes,
plasma
20%
weight between rats
6 obese and 5 obese
lipoprotein
on
containing
was
50 ACS Paragon Plus Environment
sensitivity low
and
density cholesterol
Ten patients with distal ulcerative colitis were treated for 2 weeks with sodium butyrate (100 mmol/L)
After butyrate irrigation, histological degree of inflammation decreased from 2.4
Page 51 of 69
Journal of Agricultural and Food Chemistry
concentrations improved
triglycerides from fish oil
of two groups but
without
or
significantly
less
were given a diet rich
with
perirenal
and
in
polyunsaturated
from
20% lard
weeks.102
triglycerides for
three
diabetes)
saturated
or
diet
rich
in fatty
epididymal fat was
polyunsaturated fatty
acids compared with the
observed in the fish
acids for two 5 weeks
diet rich in saturated fatty
oil
period.103
acids.103
fed
group
containing
LC n-3
PUFA
that
protective against
and 2 weeks with placebo in random order (single-blind trial).104
+/- 0.3 to 1.5 +/- 0.3. The endoscopic score fell from 6.5 +/- 0.4 to 3.8 +/- 0.8. On placebo, all of these parameters were 104 unchanged.
Immune incompetent Nu/Nu female BALB/c mice were injected subcutaneously with MDA-MB-231-GFP human breast cancer cells. Mice were treated with αtocopherol, γ-
γ-Tocopherol (25 µM) treated cells
has role the
accumulation
of
body fat through a lesser accumulation of fat in existing adipocytes.102 3.
Tocopherols
13.7 mg/100g
Eighty
overweight
At
3
individuals (BMI >27
plasma
kg/m2)
insulin
were
months, glucose
fasting and
concentrations
randomly allocated to
were significantly reduced
receive either 800 IU
and homeostasis model
51 ACS Paragon Plus Environment
γ-tocopherol, allracemic-αtocopherol, αtocopherol etherlinked acetic acid analog but not α-
Journal of Agricultural and Food Chemistry
vitamin E per day for
Page 52 of 69
assessment increased.105
3 months that was increased
to 1,200
IU per day for a further 3 months.105
4.
Carotenoids
-----------
Twelve-week-old NMRI
ATRA
The oxidative
Increased
--
male mice received one
administration
stress was evaluated
oxidation,
daily
triggered in NMRI
in 55 diabetic patients
lipid peroxidation and NO
trans
mice a reduction of
and 40 healthy
levels,
retinoic acid (ATRA) at a
body weight and of
subjects
dose of 10, 50 or 100
the
of
measuring the levels
enzymatic
mg/kg body wt during
Interscapular brown
of protein oxidation,
nonenzymatic
the 4 days.107
adipose
lipid
antioxidants and playing a
injection
subcutaneous of
all
mass
tissue,
by
52 ACS Paragon Plus Environment
protein
decreases
the
levels of and
tocopherol, allracemic-α-tocopherol, α-tocopherol etherlinked acetic acid analog and α tocopherol + γ tocopherol.107
tocopherol and α tocopherol + γ tocopherol significantly inhibited tumor burden of human MDA-MB231 cells in nude mice. Immunohistochemica l analyses of tumor tissue showed that all-rac-αT and α-TEA increased apoptosis and decreased proliferation in tumor cells while γT was associated with increased tumor cell apoptosis only.
Page 53 of 69
Journal of Agricultural and Food Chemistry
epididymal
white
peroxidation
and
major role in diabetic
adipose tissue and
some enzymatic and
complications.
inguinal
white
nonenzymatic
β-carotene
adipose
tissue
carotene,
depots.107
(βretino)
antioxidants.108
(µmol/l)-
healthy-
3.86±0.34,
diabetic
individual-
2.23±0.4,
Retinol
(µmol/l)-
healthy-
3.24±0.65, diabetic- 1.75±0.52.108 5.
Isoflavanoids
-----------
Ovariectomized
693 individuals with
In women, a decreasing
--
mice (9 mo old) were
mg/kg)
type 2 diabetes and
trend in the risk of type 2
given 0, 150, or 1500
food intake (FI) by
698
diabetes
mg/kg genistein for 3
14%
included
weeks. (PM),
female
Parametrial inguinal (ING),
Genistein
(1500 reduced
controls
study.
was demonstrated with
weight (BW) by 9%.
Isoflavone biological
categories of increasing
PM
ING
markers
genistein
were
daidzein,
There was no association
and
and
body
in
were
(genistein,
concentration.
and retroperitoneal (RP)
weights
fat pads were weighed
decreased 22% and
glycitein and equol)
between the risk of type 2
and assayed for apoptosis
19%
were
diabetes and the plasma
(%
Apoptosis in ING
plasma to examine
concentration of daidzein
fat
whether
and glycitein. In men, the
fragmentation.109
DNA
respectively.
was increased
measured
in
isoflavones
53 ACS Paragon Plus Environment
The pancreas of anaesthetized female nude mice was exposed to pancreatic cancer cells COLO 357 and L3.6pl. Mice were divided into four groups: (a) untreated control; (b) only gemcitabine (80 mg/kg body weight), once every other day (i.v. injection); (c) genistein, everyday orally for 10 days; and (d) genistein and 111 gemcitabine.
Treatment with either genistein or gemcitabine alone in mice harboring COLO 357 cells caused 13% and 27% reduction in tumor weight, respectively. combination of genistein and gemcitabine treatment showed significant decrease (75%) in tumor weight compared with untreated 111 control.
Journal of Agricultural and Food Chemistry
290%.109
Page 54 of 69
are associated with
concentrations of the four
the development of
isoflavones
type
glycitein,
2
diabetes
genistein, daidzein
showed
and
according to
equol
no
sex.110
association with risk of type 2 diabetes.110
6
Phytoestrogens
Genistein (0.01, 0.3,
A
incubated with genistein
0.6
postmenopausal
(0.01, 0.3, 0.6 and 1
clearly restricted (1
women
mM). [14C]acetate was
nM)
controlled
used as the substrate for
glucose conversion
lipogenesis.112
-----------
Rat
-------
adipocytes
were
total
of
32
of
N u d e BAL B / c m
Compared
phytoestrogen
icewere use d f
control, formononetin
supplementation
or
suppressed tumor
demonstrated
subcutaneous
growth. High dose of
diabetes were given
significantly lower mean
implantation of human
formononetin showed
to total lipids in the
phytoestrogens
(soy
values for fasting insulin
cervical
cell
much more inhibiting
absence
protein
g/day,
(mean ± SD 8.09±21.9%)
HeLa. When tumors
and
reached about 5 mm in
effect of tumor growth than low dose.115
and
1
mM)
[U-14C]
and
with
12
placebo, diet-
type
30
After
2
weeks
insulin
resistance
tumor
presence of insulin.
isoflavones
The anti-lipogenetic
mg/day)
action of genistein
placebo (cellulose 30
the mice were divided
may be an effect not
g/day) for 12 weeks.
into three groups (n
only of alteration in
114
=8) and were
glucose
132 versus
transport
and metabolism, but
54 ACS Paragon Plus Environment
(6.47± 27.7%).114
diameter,
administered per os with different doses of formononetin.115
with
Page 55 of 69
Journal of Agricultural and Food Chemistry
this
phytoestrogen
can also restrict the fatty acids synthesis and/or
their
esterification.112 7.
Phenolic
-----------
Polyphenols were given
Body weights at 2-9
Phenolic
compounds
-------
to female mice at a dose
weeks and the final
containing
rutin
concentrations 200 and
oral lesions and 10
improvement
of 570 mg/kg for 9
parametrial adipose
(1.36% w/w), caffeic
400 mg/kg reduced blood
healthy
seen in seven
weeks. 116
tissue weights were
acid (12.03% w/w),
glucose level by 17.04%
were asked to apply
patients’
significantly
gallic
and 42.10%,
freeze-dried
disease
lower
acid
extract
(4.78%
Phenolic
extract
at
Twenty
individuals
individuals
black
Histopathologic was
lesions, progression
in mice fed the high-
w/w) and
respectively in diabetic
raspberry
(increase) in grade in
fat diet with 5%
catechin (0.46% w/w)
rats.
Gel (0.5 g applied four
four
polyphenols.116
of S. torvum fruit was
Immunohistochemical
times
6
patients,
administered orally at
observation of islets in
weeks for a total 84g
patients’
a dose of 200 and 400
extract
applied over the study
exhibited no change
mg/kg/day
rats showed apparent β-
duration). 118
(stable
to
streptozotocin
treated
diabetic
cells regeneration.117
daily
for
and
disease)
induced diabetic rats
microscopic
for 30 days.117
appearance.118
55 ACS Paragon Plus Environment
nine lesions
in
Journal of Agricultural and Food Chemistry
Page 56 of 69
Table 2 (A). Phenolic contents in native chickpeas (µg/g) Sl. No.
Compound
Hithamani et al.,13 (µg/g)
Kalogeropoulos et al.,87 (µg/100g)
Fratianni et al.,88 Castelcivita Ecotype
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.
Gallic acid Protocatechuic acid p-hydroxy benzoic acid Gentisic acid Vanillic acid Syringic acid p-coumaric acid Ferulic acid Sinapic acid Salicylic acid Luteolin t-cinnamic acid Caffeic acid Chlorogenic acid p-Hydroxyphenylacetic acid
40.2 358.9 10.5 26.0 80.8 222.1 n.d. 0.90 7.81 n.d. 1.56 n.d. NA NA NA
n.d. n.d. 27.5 NA 56.9 n.d. 90.4 125.7 115.7 NA NA 35.3 128.7 87.9 n.d.
6,20 NA NA NA NA NA 0,43 5,03 NA NA 0,55 NA 0 4,62 NA
16. 17. 18. 19. 20. 21. 22. 23. 24.
Phloretic acid Catechin Chrysin Epicatechin Genistein Kaempferol Quercetin Resveratrol Rutin
NA NA NA NA NA NA NA NA NA
n.d. 152.7 169.7 88.3 91.7 n.d. n.d. 117.1 NA
NA 178,21 NA 1,23 NA NA 3,17 NA 0
56 ACS Paragon Plus Environment
(µg/g)
Sassano Ecotype 5,42 NA NA NA NA NA 0 8,37 NA NA 0 NA 0 7,37 NA
NA 147,49 NA 1,36 NA NA 0,37 NA 0
Page 57 of 69
Journal of Agricultural and Food Chemistry
Table 2 (B). Impact of domestic processing on phenolic components of chickpea % influence during these conditions Sl. No. compound native(µg/g) 1. Gallic acid 40.2 2. Protocatechuic acid 358.9 3. p-hydroxy benzoic acid 10.5 4. Gentisic acid 26.0 5. Vanillic acid 80.8 6. Syringic acid 222.1 7. p-coumaric acid n.d. 8. Ferulic acid 0.90 9. Sinapic acid 7.81 10. Salicylic acid n.d. 11. Luteolin 1.56 12. t-cinnamic acid n.d. Total identified 748.8 phenolic compound
sprouting roasting -63.4 n.d. -93.6 +43.2 -6.2 +41.9 -41.9 +32.3 -8.1 -13.1 -6.9 -186.9 n.d. n.d. n.d. n.d. 0 n.d. +29.2 (fold) n.d. n.d. n.d. n.d. n.d. -50.2 +9.5
pressure-cooking -68.6 +30.0 n.d. -47.6 -90.6 -15.8 +0.33 (fold) +7.7 -0.47 +76.6 (fold) +4.1 (fold) n.d. +7.8
open-pan boiling -60.9 -20.8 +448.5 -41.5 -57.4 +21.6 +0.51 (fold) -6.6 -93.9 +37.5 (fold) +5.3 (fold) n.d. -3.2
microwave heating -48.2 -13.0 +407.6 -28.8 -44.1 +59.7 +0.46 (fold) -6.6 -93.7 +6.57 (fold) +6.5 (fold) +2.93 (fold) +10.2
n.d. : not detectable; +sign : increase; - sign : decrease; Hithamani et al.,13
Table 2 (C). Impact of domestic processing on bioaccessible phenolic compounds of chickpea % influence during these conditions Sl. no.
compound
native(µg/g)
sprouting
roasting
pressure-cooking
57 ACS Paragon Plus Environment
open-pan boiling
microwave heating
Journal of Agricultural and Food Chemistry
1. Gallic acid 78.5 +4.3 2. Protocatechuic acid 45.7 +10.0 3. Salicylic acid 322.6 +63.3 4. Rutin 29.8 -54.6 5. t-cinnamic acid n.d. n.d. Total identified 476.6 -44.6 phenolic compound (µg/g) +sign : increase; - sign : decrease; Hithamani et al.,13
+13.2 +4 (fold) -27.2 +1.6 +153 (fold) +45.5
-29.5 +4.1 (fold) 0 +7.7 n.d. +25.3
1018
58 ACS Paragon Plus Environment
Page 58 of 69
+0.8 +62.1 -13.8 +34.5 n.d. -1.1
+27.6 +3.7 (fold) -0.5 +9.3 n.d. +30.6
Page 59 of 69
Journal of Agricultural and Food Chemistry
1019
Table 3. Impact of domestic processing on total Polyphenols and Flavonoids content and their bioaccessibility in
1020
chickpea Native
Sprouting
Roasting
1.54
1.86
1.75
1.49
1.62
1.75
+8.72
1.47 0.10
pressure cooking
Open pan boiling
Microwave heating
1021 TPC (mg/g)
a
bioaccessible TPC (mg/g)
1022
% bioaccessibility
1023
TFC (mg/g)
1024
bioaccessible TFC (mg/g)
1025
% bioaccessibility
a
_
b
b
_
2.36
2.53
3.43
1.33
1.35
1.40
+17.44
-10.72
-9.39
-6.04
1.75
1.43
0.29
0.24
0.33
0.13
0.10
0.11
0.10
0.09
0
+10
+30
+sign : increase; - sign : decrease; aGallic acid equivalents,
b
0
-10
Catechin equivalents; TPC: total phenolic content: TFC : total
flavonoids content : Hithamani et al.,13
59 ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
1026
Page 60 of 69
Table 4. Toxic components of raw chickpea
Toxic compounds
Anti-nutritive
References 1027
Amount
Unit
Trypsin inhibitor activity
8.29-11.90
mg protein/dm
31, 37
Amylase inhibitor
11.6-81.4
g protein/dm
52
Phytic acid
1.21-10.6
g/kg
31, 37
Polyphenol
3.39
-
31
Saponin
0.91
mg/g
31
Tanin
4.85
mg/g
31
Raffinose
0.62-1.45
g/100g dm
31
Ciceritol
2.51-2.78
-
Stachyose
0.74-2.56
-
Verbascose
0-0.19
-
Compounds (ANCs)
Oligosaccharides
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Page 61 of 69
Journal of Agricultural and Food Chemistry
Table 5. Deleterious and beneficial effects of anti-nutrient compounds found in chick pea S.
Anti Nutrient
No.
Compound
1.
Experimental Settings
different
doses
of
Deleterious health outcomes
trypsin
Experimental Settings
Beneficial health outcomes
Dose dependent increase in relative Ten Type I diabetic patients with normal
Four
Inhibitors
inhibitor i.e. 0, 0.3, 0.6 and 1.2% in
pancreatic weight, cell volume, nuclear insulin requirement were given
I
well as plasma free insulin was
diet were given to mice on day 2 and
density as well as mitotic index was labelled soluble insulin (10U) together
higher in protease inhibitor
7.89
observed.89
with protease inhibitor (100000 KIU) or
group as compared to diluents
its
group.90
diluent
on
two
125
consecutive
The absorption rate of
125
Trypsin
I as
mornings.90 2.
Amylase
Thirteen
Inhibitors
individuals
were
given
Over the 8-h observation period, 4.7
Seven healthy male volunteers were
15 minutes after administration
lactulose 20 g, spaghetti alone, and
+/-
was
administered with 100 g of starch in 175
blood
spaghetti with amylase inhibitor (3.8
malabsorbed and 7.0 +/- 1.4% of the
ml/person that also contain α-amylase
significantly reduced and the
g). Samples of breath were collected
spaghetti with amylase inhibitor was
inhibitor (350 mg and 700 mg).92
serum
(at frequent intervals) for 2 h after the
malabsorbed. It was also found that
lactulose and for 8 h after the
amylase inhibitor at a concentration of
spaghetti meal and analyzed for
more than 5 mg/ml decreased the
hydrogen concentration.91
amylase activity by more than 96% in
1.9%
of
the
spaghetti
glucose
insulin
levels
level
were
was
increased after 30 and 45 min.92
duodenal juice.91 3.
Phytolectins
Two
rat
intestinal
brush
border
Line of precipitation was observed
61 ACS Paragon Plus Environment
Different
foods
containing
lectins
Out of these foods, chick pea
Journal of Agricultural and Food Chemistry
Page 62 of 69
membrane peptidases were assayed
with
when
(wholemeal bread, white bread, white
and red kidney bean lectins
for their interaction with various sugar
diffused against the two peptidases on
rice, corn flakes soybean, black eyed
(180 HU/mg and 360 HU/mg)
specific lectins.93
immunodiffusion plates. No precipitin
beans, chick pea, red kidney bean etc)
had the capability to lower the
line was formed with concanavalin A,
were tested for their capability of
blood glucose due to their
wheat germ agglutinin and ricin.93
lowering glycemic index in normal and
binding of carbohydrates and
diabetic persons.94
thereby lowering the glycemic
phytoheamagglutinin
index.94 4.
Saponins
Twenty male Brown Norway rats
histological examination of tissue
Tiqueside, a synthetic saponin was given
Tiqueside produced a dose-
were exposed to β-lactoglobulin or
samples
in 3 different doses (1, 2 and 3 gm/day)
dependent reduction in plasma
saponin or a combination of both.95
exposed to saponin
to 15 hypercholesteromic outpatients
LDL cholesterol levels in the
revealed signs of epithelial damage,
(low-density lipo protein cholesterol >
hypercholesteromic patients.96
infiltration of
160 mg/dl) for three 2 weeks treatment
eosinophils and slight to moderate
periods, each separated by a 3-week
villus atrophy.
placebo period.96
from intestinal
Damaged
segments
epithelial
cells were most evident
at
villus
tips
in
nonsensitised animals, where
the
mucosa
had
been
exposed to saponin before addition of β-lactoglobulin.95
62 ACS Paragon Plus Environment
Page 63 of 69
5.
Journal of Agricultural and Food Chemistry
Tannins
solutions
It was found that the water-soluble
Young rats were maintained for 6.5
Oxidative stress in different
(containing 10, 20 or 30 mg) were
fraction of tannin has the ability to
weeks on diets of rat chow and either
organs of rats that received
brought to 20”. Casein in aqueous
bind casein
water or green tea containing tannins ad
green tea (containing tannins)
solution (18.9 mg in 4 ml) was
complex.97
lib.98
was reduced in comparison of
5
ml
of
the
tannin
in
the
form
of
a
mice that received water.98
added to each, followed by 3 ml of 0.1 M sodium citrate buffer of pH 5.0. After 2 or 15 hr, samples were centrifuged (3000 revjmin, 5 min). The sedimented complexes
were
washed
with
buffer, rinsed briefly with water to remove buffer, and dried at 85 0C. 97
6.
Phytic acid
8-9 healthy adults were given 200 g
The addition of phytic acid lowered
Male rats were divided into four groups
In the rats treated with the
phytic acid-free wheat bread on days
fractional
magnesium
of 15, 10, 10 and 12 rats each. The rats
aqueous phytic acid and phytic
1 and 3. Phytic acid was added in
absorption from 32.5 +/- 6.9% (no
of Group I were treated with ethylene
acid/zinc mixture, the number
whole-meal (1.49 mmol) and in
added phytic acid) to 13.0 +/- 6.9%
glycol; of Group II with ethylene glycol
of
brown bread (0.75 mmol). Each test
(1.49 mmol added phytic acid; P