Microbial Biosynthesis of Silver Nanoparticles in Different Culture

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Microbial biosynthesis of silver nanoparticles in different culture media Ke Luo, Samuel Jung, Kyu-Hwan Park, and Young-Rok Kim J. Agric. Food Chem., Just Accepted Manuscript • DOI: 10.1021/acs.jafc.7b05092 • Publication Date (Web): 11 Jan 2018 Downloaded from http://pubs.acs.org on January 12, 2018

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Journal of Agricultural and Food Chemistry

Microbial Biosynthesis of Silver Nanoparticles in Different Culture Media

Ke Luo,† Samuel Jung,† Kyu-Hwan Park and Young-Rok Kim*

Graduate School of Biotechnology & Department of Food Science and Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Korea

*

Corresponding author: [email protected]

Phone: +82-31-201-3830; Fax: +82-31-204-8116

† K.L. and S.J. contributed equally to this work.

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ABSTRACT

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Microbial biosynthesis of metal nanoparticles has been extensively studied for the

3

applications in biomedical sciences and engineering. However, the mechanism for

4

their synthesis through microorganism is not completely understood. In this study,

5

several culture media were investigated for their roles in the microbial biosynthesis of

6

silver nanoparticles (AgNPs). The size and morphology of the synthesized AgNPs

7

were analyzed by UV–Vis spectroscopy, FT-IR, TEM, and DLS. The results

8

demonstrated that nutrient broth (NB) and Mueller-Hinton broth (MHB) among tested

9

media effectively reduced silver ions to form AgNPs with different particle size and

10

shape. Although the involved microorganism enhanced the reduction of silver ions,

11

the size and shape of the particles were shown to mainly depend on the culture media.

12

Our findings suggest that the growth media of bacterial culture play an important role

13

in the synthesis of metallic nanoparticles with regard to their size and shape. We

14

believe our findings would provide useful information for further exploration of

15

microbial biosynthesis of AgNPs and their biomedical applications.

16 17

KEYWORDS: silver nanoparticles, microbial biosynthesis, extracellular, culture

18

media, nutrient broth, Mueller-Hinton broth

19 20

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INTRODUCTION

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Metal nanoparticles have attracted considerable attention due to their unique

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physicochemical characteristics including catalytic activity, optical properties,

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electronic properties, antimicrobial activity and magnetic properties, etc.1 Amongst

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them, silver nanoparticles (AgNPs) are used extensively in various applications that

26

includes disinfecting medical devices and home appliances to purifying drinking

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water.2-4 AgNPs are also well-known antimicrobial agent against various pathogenic

28

microorganisms.5 Furthermore, owing to their unique plasmon-resonance optical

29

scattering properties, AgNPs are currently recognized for their potentials in bio-

30

sensing, medical diagnostics and therapeutics, and biological imaging applications.6-8

31

Due to the environmental issues raised over the past decades, the synthesis of

32

metal nanoparticles by biological process has drawn a great deal of attention.9

33

Numerous biosynthesis methods utilizing bacteria, fungi, plant, and plant extract as

34

reducing agents for the synthesis of AgNPs have been exploited in recent years.5, 10-14

35

Amongst them, the synthesis of AgNPs by living microorganisms is a well-known

36

biomimetic approach, since some microorganisms have been found to synthesize

37

inorganic materials, such as gold nanoparticles,15 magnetite nanoparticles,16 silver

38

nanoparticles,17 and zinc sulfide nanoparticles.18 Bacteria is known to reduce metal

39

ions to metal nanoparticles either intra- or extracellularly. However, the mechanism

40

for intra- and extracellular synthesis of nanoparticles differs depending on the

41

biological agents. In the intracellular synthesis of nanoparticles, metal ions are

42

uptaken by certain microorganisms and bind to either a metal ion reductase or similar

43

proteins, resulting in the reduction of the ions to elemental metals in their zero-valent

44

form, followed by the formation of nanoparticles in cytoplasm.19 In this case, an extra

45

step is required for the purification of the produced nanoparticles if they are to be

46

used for further applications. The electrostatic interaction of the positively charged 3

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metal ions and negatively charged cell wall of the bacteria play important role in ion

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transportation in the microbial cell. The intracellularly synthesized metallic

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nanoparticles could eventually be effluxed out of the cell.20 On the other hands, the

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extracellular synthesis of metal nanoparticles is generally carried out by the reductive

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components released from the cell. For example, DNA, NADH-dependent reductase

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and sulfur-contained protein secreted from the cell can induce the reduction of Ag+

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ion to Ag0 stage leading to the formation of AgNPs.21-23 Since the electronic and

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optical properties of metal nanoparticles are size- and shape-dependent, the control of

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size and shape of the particles is one of the most important aspect for their specific

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applications.24 Moreover, previous studies have reported that antimicrobial nature of

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AgNPs showed to be depend on their size and shape, where smaller nanoparticles

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displayed better antimicrobial activity.23 It has been demonstrated that AgNPs with

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different

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microorganisms.25 However, the effect of the growth environment, such as culture

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medium, on the synthesis of AgNPs in a way of affecting their size and shape is not

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fully understood. In addition, Herein, we report the effect of culture media and several

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media components on the synthesis of AgNPs in terms of the size and morphology of

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the particles.

sizes

and

shapes

can

be

synthesized

by

employing

specific

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Media, chemicals, and microorganism. Mueller-Hinton broth (MHB) was

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purchased from Difco (Lawrence, USA). Yeast extract was purchased from Daejung

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chemical Co. (Siheung, Korea). Peptone A and beef extract were purchased from

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BIOSESANG (Seongnam, Korea). Silver (I) nitrate was purchased from Daejung

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chemical Co. (Siheung, Korea). Klebsiella pneumoniae KCTC 2242 and Escherichia

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coli DH5α were obtained from the Korean Collection for Type Cultures (Daejeon,

MATERIALS AND METHODS

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Korea).

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Preparation of culture mediums. To synthesize silver nanoparticles, thirteen

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types of culture mediums were prepared as reducing agent. Abbreviation of different

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reducing agents was listed in Table 1. MHB, beef extract, peptone A, and yeast extract

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solutions were prepared by dissolving 21g of MHB, 3g of beef extract, 5g of peptone

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A, and 5g of yeast extract in 1L distilled water, respectively. Nutrient broth without

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NaCl (NB) was prepared by dissolving 5g of peptone A and 3g of beef extract in 1L

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distilled water. NaCl was excluded when preparing Nutrient broth to prevent Cl- effect

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that could interact with silver ion and produce AgCl sediment. For preparation of

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culture supernatant (N-KP S, N-EC S, M-KP S, and M-EC S) and inoculum (N-KP I,

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N-EC I, M-KP I, and M-EC I), MHB and NB media were inoculated with K.

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pneumoniae or E. coli, and incubated in shaking incubator (HB-201SL, Hanbaek

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Scientific Co., Korea) at 220 rpm and 37 °C until the inoculum reached an O.D600 of

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1.0, reflecting the number of K. pneumoniae and E. coli were around 7 × 107 CFU/ml

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by plate counting. The microbial synthesis of silver nanoparticles was carried out in a

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reaction containing either E. coli or K. pneumoniae to a final concentration of 3.5 ×

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106 CFU/ml.

92 93

Biological synthesis of AgNPs. 500 µl of each reducing agent was added into a

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glass vial containing 10 ml of 1mM AgNO3 and incubated at 25 °C with a gentle

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rotation (ROTATOR-AG, FINEPCR, KOREA) at 10 rpm. Since light could affect the

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synthesis of AgNPs,26 the reaction was carried out in dark incubator, in which a

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fluorescent lamp (FPL27EX-D, Sigma lamp, Incheon, Korea) was equipped to offer

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controlled irradiation with 10 cm of distance away from the sample during the 5

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synthesis. To investigate the irradiation effect on the synthesis of AgNPs, we carried

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out the reaction with or without the visible-light irradiation in MHB and NB for 6

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hours. To monitor the yield of AgNPs synthesized from the reactions, an aliquot (100

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µl) of reaction was taken every 0.5 h and its absorbance (O.D430) was measured using

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UV-vis spectrophotometer (Infinite 200 PRO, TECAN, Switzerland).

104 105

Characterization of synthesized AgNPs. The synthesized AgNPs were washed

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3 times with water and ethanol (20 %) to remove the medium that could possibly

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remained on the surface of AgNPs. Absorption spectra of the nanoparticles were

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analyzed by the UV-vis spectrophotometer (TECAN) at wavelengths ranging from

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360 nm to 600 nm. One drop of AgNPs suspension was placed onto a carbon-coated

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copper TEM grid (3.05 mm diameter), and dried at desiccator under vacuum. After

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the sample was completely dried, the synthesized AgNPs were characterized by using

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field emission transmission electron microscopy (FE-TEM, JEM-2100F, JEOL, USA).

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The size distribution of synthesized AgNPs were determined by dynamic light

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scattering (DLS) (Zetasizer Nano ZS, Malvern, England) under the setting of

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refractive index (RI) of 1.33 with 25 replications.

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The FTIR absorption spectra of AgNPs synthesized by NB and MHB media were

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measured using a Perkin-Elmer Spectrum One System spectrometer (Foster City, CA,

118

USA) with KBr pellets in the range of 500 to 4000 cm−1.

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Synthesis of silver nanoparticles in different culture media. As the

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synthesis of AgNPs could be influenced by light irradiation from external

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environment,27, 28 the reaction solution consisting of silver ions and various culture

RESULTS AND DISCUSSION

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media was placed in a dark incubator with a fluorescent lamp providing a controlled

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irradiation toward the sample with a distance of 10 cm. Abbreviations of different

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culture media used for the reduction of silver ions were listed in Table 1. Figure 1A

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shows the color of reaction after incubating 1 mM AgNO3 solution with various

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media at 25 °C for 2 days. AgNO3 solution without any culture media was used as a

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control. We did not observe any notable sediment that is an indicative of silver salt

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formation during or after the reaction with all test media. The results show that the

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reaction solution containing PA, BE, NB, and MHB exhibited brown color owing to

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the excitation of surface plasmon vibrations of the synthesized AgNPs,29, 30 while

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there was no significant color change in the reaction containing YE compared to that

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of control. The UV–Vis spectra of AgNPs synthesized using different culture media

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are shown in Figure 1B. AgNPs synthesized by PA, BE, and NB showed a distinct

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absorbance peaks at the range of 430 nm to 440 nm, which falls between a typical

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SPR band of spherical AgNPs (400-450 nm),31 whereas no such a characteristic peak

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was observed in a reaction with YE (Figure 1B). In particular, AgNPs synthesized by

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MHB showed a remarkable red-shift of absorption peak (480 nm), implying that they

141

would have a different size or shape from those synthesized by other media. The

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absorption intensity demonstrated that NB and MHB yielded a larger amount of

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AgNPs, suggesting that catalytic activity in the reduction of silver ions was dependent

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on the composition of culture media. Since NB is composed of BE and PA, its

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reducing power would mainly be derived from the synergistic effect of BE and PA on

146

reduction activity. On the other hand, we assume that the casein hydrolysate and

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starch derivatives in MHB acted as a main reducing agent for the synthesis of AgNPs.

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The deprotonated form of the hydroxyl and carboxylic groups in these compounds is

149

believed to facilitate the complexation of Ag ions.32 Subsequently, the Ag ions were

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reduced to form AgNPs through the oxidation of these groups into carbonyl form, 7

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which also modulated the crystal growth of AgNPs. The shape and size of the

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synthesized AgNPs were visualized through TEM (Figure 1C). The TEM results

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showed that silver ‘seeds’ with diameter of about 5 nm appeared along with large

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spherical AgNPs of an average particle size of 20 nm when the silver ions were

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reduced by PA and BE media. We assume that the presence of large number of silver

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seeds is possibly due to the insufficient reduction of AgNPs in PA and BE media,

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limiting the transition from the nucleation stage to the growth stage during the

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synthesis process, which was also evidenced by the decreased absorption of AgNPs in

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a reaction with PA and BE media (Figure 1B). However, for the reaction with NB

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media consisting of a mixture of PA and BE, we observed highly monodisperse

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spherical AgNPs with a diameter of about 20 nm. On the other hand, MHB media led

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to the formation of large AgNPs with a shape of planar triangle and discal

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nanostructure. It has been also reported that the silver discal nanoplates showed an

164

absorption maximum at around 480 nm,33 which supports the fact that the red shifted

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absorption of MHB-AgNPs was associated with the significant difference in

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morphology from those synthesized by other media. Thus, our findings suggested that

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the size and shape of AgNPs were shown to be depending on the media compositions,

168

such as protein and carbohydrate, which not only affect the nucleation of Ag0 but also

169

influence the growth and formation of AgNPs.34

170 171

Characteristics of AgNPs synthesized by NB and MHB medium. As MHB

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and NB exhibited higher catalytic activity in the reduction of silver ions among the

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components of culture media, these two culture media were selected as a model to

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investigate the effect of media on the synthesis of AgNPs with respect to the size and

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shape. Considering the irradiation effect that can enhance the reduction of silver

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ions,35 AgNPs synthesis using MHB (MHB-AgNPs) and NB (NB-AgNPs) were 8

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performed under two different conditions, with or without light exposure (Figure 2A).

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In both cases, MHB induced a greater increase in absorbance than that of NB. When

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the reactions were carried out with light, the absorbance (at 480 nm) of the reaction

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containing MHB increased rapidly within 3 h, followed by a gradual saturation over

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the rest of reaction time, whereas the reaction with NB media showed a slower

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increase in the value over the course of 6 h reaction. On the other hand, the reactions

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without light showed different results. As expected, the absorbance (at 480 nm) of the

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reaction with MHB was higher than that with NB (at 430 nm), but the overall values

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were significantly lower than those with light. In addition, the absorption values of the

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reaction with MHB reached a saturation level after 0.5 h, suggesting that light

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synergistically participates in the reduction of silver ions together with other reducing

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components in culture media. In addition, DLS analysis was carried out to investigate

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the size distribution of the synthesized AgNPs (Figure 2B). According to DLS data,

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the average hydrodynamic diameter of the AgNPs synthesized by MHB was 78.8 nm,

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which was approximately four-fold bigger than those synthesized by NB (21.1 nm). In

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addition, the AgNPs synthesized by NB and MHB medium were subjected to FTIR

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analysis to investigate the composition of the surface of AgNPs, which could play an

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important role in determining the sizes and the colloidal stability of the nanoparticles

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(Figure 2C). FTIR spectrum showed several absorption peaks at 3340, 1645, 1589,

196

1541, 1384, and 1076 cm−1 in the spectrum scanned from 500 to 4000 cm−1. The IR

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bands observed at 3340, 1075, and 1589 cm-1 in AgNPs synthesized by MHB

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represent the characteristics of the O-H, C-O-C, and C=C stretching, respectively,36

199

and the band at 1384 cm−1 is derived from the NO3- remained in the solution.37 It

200

should be noted that the absorption peaks of NB-based AgNPs at 1541 cm-1 and 1645

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cm-1 were originated from the bending vibrations of the amide I and amide II bands of

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the proteins, respectively, suggesting that the proteins adsorbed on the surface of 9

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synthesized AgNPs as a capping agent could enhance the colloidal stability of the

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particles.38 From the results, the protein adsorbed on the surface of the nanoparticles

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could inhibit the further coprecipitation of Ag on the surface of AgNPs, resulting in

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the formation of small and highly monodisperse AgNPs in contrast to those

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synthesized by MHB. In other words, the morphology of synthesized AgNPs could be

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influenced by the composition of amino acids in NB and MHB. NB media is

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comprised of water soluble PA and BE, which are derived from partially hydrolyzed

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proteins and beef infusion, respectively. On the other hand, the primarily component

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of MHB media is casein hydrolysate whose amino acid composition and sequence are

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much different from those from NB media. From the results, we propose that the

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composition of culture media not only play an important role in the synthesis of

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AgNPs, but also affect the particles size through the interaction between the surface of

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AgNPs and the media components.

216 217

Microbial biosynthesis of AgNPs. To investigate the effect of bacterial

218

metabolites on the synthesis of AgNPs, NB and MHB media were inoculated with K.

219

pneumoniae and E. coli, and their whole bacterial culture and the culture supernatant,

220

which represents the cellular and extracellular matrices, respectively, was examined.

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In this study, we tested Klebsiella pneumoniae since this microorganism has

222

intensively been investigated for the cell-associated biosynthesis of AgNPs.17, 26, 39, 40

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Escherichia coli is also widely used model microorganism in biological study, and we

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used it as a control microorganism. Reduction of silver ions was not observed in the

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reaction without NB or MHB media (Figure 3A), indicating that the intrinsic reducing

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power of the microorganisms at test concentration were not strong enough to reduce

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silver ions to form AgNPs. On the other hand, regardless of the types of media, the

228

intensity of absorption band was increased by the introduced microorganisms (Figure 10

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3B and 3C), which clearly indicates that the bacterial components or metabolites, such

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as NADH-dependent reductase and nitrate reductase, could facilitate the synthesis of

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AgNPs along with media components.13,

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culture of K. pneumoniae showed higher absorbance compared to that of E. coli,

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which agrees well with the previous observation.41 This might be due to the higher

234

metabolic activity of K. pneumoniae, because we observed a rapid growth of K.

235

pneumoniae in both culture media comparing to E. coli (see S1 in Supporting

236

Information). Moreover, the absorption amplitude of MHB-AgNPs was greater than

237

that of NB-AgNPs (Figure 3c), regardless of the presence of bacteria or bacterial

238

metabolites, indicating that culture media play a major role for the yield of AgNPs. In

239

addition, we observed a slight blue-shift in the absorption peak of AgNPs synthesized

240

by MHB with bacteria from 480 nm to 475 nm comparing to that without bacteria. On

241

the other hand, no shift of absorption peak was observed for the AgNPs synthesized

242

from NB containing bacterial culture or culture supernatant. TEM and DLS analysis

243

revealed that the presence of bacteria or types of bacteria had no effect on the size and

244

shape of the synthesized AgNPs (Figure 4A and 4B). We speculate that the resulting

245

blue-shift observed in the reaction with MHB and bacteria might be due to the

246

interaction of proteins released from the introduced microorganism with

247

biosynthesized AgNPs.42 Moreover, we found that the diameter of AgNPs synthesized

248

from NB media were significantly smaller than those synthesized from MHB media.

249

The size differences of AgNPs synthesized from NB media with K. pneumoniae and E.

250

coli were insignificant (Figure 4A and 4B). TEM results also showed that the shapes

251

of AgNPs obtained from NB-based group were independent of the type of

252

microorganism. Crystalline nature of the AgNPs synthesized was further examined by

253

the SAED pattern with bright circular spots corresponding to (1 1 1), (2 0 0), (2 2 0),

254

(3 1 1), and (2 2 2) Bragg reflection planes.43 SAED pattern of MHB-AgNPs with

22

Note that AgNPs synthesized with a

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bright circular rings corresponding to (1 1 1), (2 0 0), (2 2 0), (3 1 1), and (2 2 2)

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planes indicated that the nanoparticles are highly crystalline. In contrast, NB-AgNPs

257

showed weak diffraction spots probably due to the interaction with proteins during the

258

synthesis process, which could affect superstructure of the nanoparticles.44 These

259

findings demonstrate that the use of different culture media predetermined the

260

morphology, size and crystal nature of biosynthesized AgNPs (Figure 4A and 4B).

261

In conclusion, we present the effect of different culture media on the

262

microorganism-mediated synthesis of AgNPs. The results suggest that the components

263

of culture media can affect the size and shape of synthesized AgNPs, independent of

264

whether the synthesis was carried out with microorganism or not. That is, culture

265

media plays a predominant role in determining the physical characteristics of

266

biosynthesized AgNPs. We hope our findings would provide a meaningful

267

information for further elucidating the exact mechanism of microorganism-mediated

268

synthesis of AgNPs.

269 270



271

This work was supported by the Korea Research Foundation Grant (NRF-

272

2016R1D1A1B03934878) and the Cooperative Research Program for Agricultural

273

Science

274

Administration, Republic of Korea.

ACKNOWLEDGEMENTS

&

Technology

Development

(PJ01199303),

Rural

Development

275 276



277

Growth curve of E. coli and K. pneumoniae in NB and MHB media (Figure S1).

SUPPORTING INFORMATION DESCRIPTION

278 279

Notes

280

The authors declare no competing financial interest. 12

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283

(1)

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nanoparticles. Nanomedicine 2010, 6, 257-262.

285

(2)

286

R., Functional finishing of cotton fabrics using silver nanoparticles. J. Nanosci.

287

Nanotechnol 2007, 7, 1893-1897.

288

(3)

289

P.; Suidan, M., An evidence-based environmental perspective of manufactured silver

290

nanoparticle in syntheses and applications: a systematic review and critical appraisal

291

of peer-reviewed scientific papers. Sci. Total Environ. 2010, 408, 999-1006.

292

(4)

293

Boughton, R., Silver nanoparticle-decorated porous ceramic composite for water

294

treatment. J. Membr. Sci. 2009, 331, 50-56.

295

(5)

296

Biomimetic synthesis and patterning of silver nanoparticles. Nat. mater. 2002, 1, 169-

297

172.

298

(6)

299

applications of localised surface plasmonic phenomenae, IEE Proc. Nanobiotechnol.

300

2005; IET: 2005; pp 13-32.

301

(7)

302

nanoparticles and its application to herbicide detection. Mater. Lett. 2008, 62, 2661-

303

2663.

304

(8)

305

M., Can silver nanoparticles be useful as potential biological labels? Nanotechnology

306

2008, 19, 235104.

307

(9)

308

Balasubramanya, R., Biological synthesis of silver nanoparticles using the fungus

309

Aspergillus flavus. Mater. Lett. 2007, 61, 1413-1418.

REFERENCES Thakkar, K. N.; Mhatre, S. S.; Parikh, R. Y., Biological synthesis of metallic

Vigneshwaran, N.; Kathe, A.; Varadarajan, P.; Nachane, R.; Balasubramanya,

Tolaymat, T. M.; El Badawy, A. M.; Genaidy, A.; Scheckel, K. G.; Luxton, T.

Lv, Y.; Liu, H.; Wang, Z.; Liu, S.; Hao, L.; Sang, Y.; Liu, D.; Wang, J.;

Naik, R. R.; Stringer, S. J.; Agarwal, G.; Jones, S. E.; Stone, M. O.,

Stuart, D.; Haes, A.; Yonzon, C.; Hicks, E.; Van Duyne, R. In Biological

Dubas, S. T.; Pimpan, V., Humic acid assisted synthesis of silver

Schrand, A. M.; Braydich-Stolle, L. K.; Schlager, J. J.; Dai, L.; Hussain, S.

Vigneshwaran, N.; Ashtaputre, N.; Varadarajan, P.; Nachane, R.; Paralikar, K.;

13

ACS Paragon Plus Environment

Journal of Agricultural and Food Chemistry

310

(10)

311

Biosynthesis of silver nanoparticles using Ocimum sanctum (Tulsi) leaf extract and

312

screening its antimicrobial activity. J. Nanopart. Res. 2011, 13, 2981-2988.

313

(11)

314

Venketesan, R., Biogenic synthesis of silver nanoparticles and their synergistic effect

315

with antibiotics: a study against gram-positive and gram-negative bacteria.

316

Nanomedicine 2010, 6, 103-109.

317

(12)

318

extract mediated synthesis of silver and gold nanoparticles and its antibacterial

319

activity against clinically isolated pathogens. Colloids Surf., B 2011, 85, 360-365.

320

(13)

321

nanoparticles synthesized by a marine fungus, Penicillium fellutanum isolated from

322

coastal mangrove sediment. Colloids Surf., B 2009, 71, 133-137.

323

(14)

324

Venkataraman, A., Extracellular biosynthesis of functionalized silver nanoparticles by

325

strains of Cladosporium cladosporioides fungus. Colloids Surf., B 2009, 68, 88-92.

326

(15)

327

assisted by Escherichia coli DH5α and its application on direct electrochemistry of

328

hemoglobin. Electrochem. Commun. 2007, 9, 1165-1170.

329

(16)

330

Biomineralization of ferrimagnetic greigite (Fe3S4) and iron pyrite (FeS2) in a

331

magnetotactic bacterium. Nature 1990, 343, 258-261.

332

(17)

333

Rapid synthesis of silver nanoparticles using culture supernatants of Enterobacteria: a

334

novel biological approach. Process Biochem. 2007, 42, 919-923.

335

(18)

336

zinc sulfide nanoparticles by immobilized Rhodobacter sphaeroides. Biotechnol. Lett.

337

2006, 28, 1135-1139.

338

(19)

Singhal, G.; Bhavesh, R.; Kasariya, K.; Sharma, A. R.; Singh, R. P.,

Fayaz, A. M.; Balaji, K.; Girilal, M.; Yadav, R.; Kalaichelvan, P. T.;

MubarakAli, D.; Thajuddin, N.; Jeganathan, K.; Gunasekaran, M., Plant

Kathiresan, K.; Manivannan, S.; Nabeel, M.; Dhivya, B., Studies on silver

Balaji, D.; Basavaraja, S.; Deshpande, R.; Mahesh, D. B.; Prabhakar, B.;

Du, L.; Jiang, H.; Liu, X.; Wang, E., Biosynthesis of gold nanoparticles

Mann, S.; Sparks, N. H.; Frankel, R. B.; Bazylinski, D. A.; Jannasch, H. W.,

Shahverdi, A. R.; Minaeian, S.; Shahverdi, H. R.; Jamalifar, H.; Nohi, A.-A.,

Bai, H.-J.; Zhang, Z.-M.; Gong, J., Biological synthesis of semiconductor

Kalimuthu, K.; Babu, R. S.; Venkataraman, D.; Bilal, M.; Gurunathan, S., 14

ACS Paragon Plus Environment

Page 14 of 25

Page 15 of 25

Journal of Agricultural and Food Chemistry

339

Biosynthesis of silver nanocrystals by Bacillus licheniformis. Colloids Surf., B 2008,

340

65, 150-153.

341

(20)

342

review. Colloids Surf., B 2014, 121, 474-483.

343

(21)

344

the antibacterial effect of silver ions on Escherichia coli and Staphylococcus aureus. J.

345

Biomed. Mater. Res. 2000, 52, 662-668.

346

(22)

347

Sastry, M., Extracellular biosynthesis of silver nanoparticles using the fungus

348

Fusarium oxysporum. Colloids Surf., B 2003, 28, 313-318.

349

(23)

350

Ramírez, J. T.; Yacaman, M. J., The bactericidal effect of silver nanoparticles.

351

Nanotechnology 2005, 16, 2346.

352

(24)

353

nanoparticles with arbitrary shapes. J. Phy. Chem. B 2003, 107, 6269-6275.

354

(25)

355

by Filamentous cyanobacteria from a silver (I) nitrate complex. Langmuir 2007, 23,

356

2694-2699.

357

(26)

358

K.; Sarkar, S.; Minaian, S.; Shahverdi, H. R.; Shahverdi, A. R., Biological synthesis of

359

very small silver nanoparticles by culture supernatant of Klebsiella pneumonia: The

360

effects of visible-light irradiation and the liquid mixing process. Mater. Res. Bull.

361

2009, 44, 1415-1421.

362

(27)

363

Photoinduced conversion of silver nanospheres to nanoprisms. Science 2001, 294,

364

1901-1903.

365

(28)

366

Controlling anisotropic nanoparticle growth through plasmon excitation. Nature 2003,

367

425, 487-490.

Hulkoti, N. I.; Taranath, T., Biosynthesis of nanoparticles using microbes—a

Feng, Q.; Wu, J.; Chen, G.; Cui, F.; Kim, T.; Kim, J., A mechanistic study of

Ahmad, A.; Mukherjee, P.; Senapati, S.; Mandal, D.; Khan, M. I.; Kumar, R.;

Morones, J. R.; Elechiguerra, J. L.; Camacho, A.; Holt, K.; Kouri, J. B.;

Sosa, I. O.; Noguez, C.; Barrera, R. G., Optical properties of metal

Lengke, M. F.; Fleet, M. E.; Southam, G., Biosynthesis of silver nanoparticles

Mokhtari, N.; Daneshpajouh, S.; Seyedbagheri, S.; Atashdehghan, R.; Abdi,

Jin, R.; Cao, Y.; Mirkin, C. A.; Kelly, K.; Schatz, G. C.; Zheng, J.,

Jin, R.; Cao, Y. C.; Hao, E.; Métraux, G. S.; Schatz, G. C.; Mirkin, C. A.,

15

ACS Paragon Plus Environment

Journal of Agricultural and Food Chemistry

368

(29)

369

chemical reactions in silica- coated gold and silver nanoparticles. Adv. Mater. 1997, 9,

370

570-575.

371

(30)

372

workers in the living factory: metal-accumulating bacteria and their potential for

373

materials science. Trends Biotechnol. 2001, 19, 15-20.

374

(31)

375

nanoparticles: a green method. Carbohydr. Res. 2004, 339, 2627-2631.

376

(32)

377

green synthesis of antibacterial silver nanoparticles. Colloids Surf., B 2013, 108, 147-

378

151.

379

(33)

380

localized surface plasmon resonance of silver nanoparticles via halide ion etching and

381

photochemical regrowth. Mater. Lett. 2016, 173, 88-90.

382

(34)

383

B.; Dawson, K. A., Physical− chemical aspects of protein corona: relevance to in vitro

384

and in vivo biological impacts of nanoparticles. J. Am. Chem. Soc. 2011, 133, 2525-

385

2534.

386

(35)

387

nanoparticles in solution from a silver salt by laser irradiation. Chem. Commun. 2002,

388

792-793.

389

(36)

390

impregnation, carbonization and oxidation conditions. J. Anal. Appl. Pyrolysis 2006,

391

75, 159-166.

392

(37)

393

synthesis of silver nanoparticles and their activity against pathogenic fungi in

394

combination with fluconazole. Nanomedicine 2009, 5, 382-386.

395

(38)

396

biosynthesis and characterization of silver nanoparticles using Aspergillus flavus

Mulvaney, P.; Giersig, M.; Ung, T.; Liz- Marzán, L. M., Direct observation of

Klaus-Joerger, T.; Joerger, R.; Olsson, E.; Granqvist, C.-G., Bacteria as

Huang, H.; Yang, X., Synthesis of polysaccharide-stabilized gold and silver

Ghodake, G.; Lim, S.-R.; Lee, D. S., Casein hydrolytic peptides mediated

Zheng, X.; Peng, Y.; Cui, X.; Zheng, W., Modulation of the shape and

Monopoli, M. P.; Walczyk, D.; Campbell, A.; Elia, G.; Lynch, I.; Bombelli, F.

Abid, J.-P.; Wark, A.; Brevet, P.-F.; Girault, H., Preparation of silver

El-Hendawy, A.-N. A., Variation in the FTIR spectra of a biomass under

Gajbhiye, M.; Kesharwani, J.; Ingle, A.; Gade, A.; Rai, M., Fungus-mediated

Jain, N.; Bhargava, A.; Majumdar, S.; Tarafdar, J.; Panwar, J., Extracellular

16

ACS Paragon Plus Environment

Page 16 of 25

Page 17 of 25

Journal of Agricultural and Food Chemistry

397

NJP08: a mechanism perspective. Nanoscale 2011, 3, 635-641.

398

(39)

399

nanoparticles using cultural filtrate of simulated microgravity grown Klebsiella

400

pneumoniae. Enzym. Microb. Technol. 2013, 52, 151-156.

401

(40)

402

effect of silver nanoparticles on the antibacterial activity of different antibiotics

403

against Staphylococcus aureus and Escherichia coli. Nanomedicine 2007, 3, 168-171.

404

(41)

405

Effect of culture medium on the extracellular synthesis of silver nanoparticles using

406

Klebsiella pneumoniae, Escherichia coli and Pseudomonas jessinii. Biocatal. Agric.

407

Biotechnol. 2016, 6, 107-115.

408

(42)

409

antibiotic activity against Gram-negative bacteria. Ind. Eng. Chem. 2015, 29, 217-226.

410

(43)

411

mushroom extract. Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 2009, 73, 374-381.

412

(44)

413

disorder transition in Ba2YCu3O7− δ observed by means of electron diffraction and

414

electron microscopy. Solid State Commun. 1987, 63, 603-606.

Kalpana, D.; Lee, Y. S., Synthesis and characterization of bactericidal silver

Shahverdi, A. R.; Fakhimi, A.; Shahverdi, H. R.; Minaian, S., Synthesis and

Müller, A.; Behsnilian, D.; Walz, E.; Gräf, V.; Hogekamp, L.; Greiner, R.,

Gurunathan, S., Biologically synthesized silver nanoparticles enhances

Philip, D., Biosynthesis of Au, Ag and Au–Ag nanoparticles using edible

Van Tendeloo, G.; Zandbergen, H.; Amelinckx, S., The vacancy order—

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Figure captions Figure 1 Synthesis of AgNPs in different culture media. (A) digital photograph and (B) UV/Vis absorption spectra of reaction solution containing various reducing agents without (left) and with silver ions (right). 1 mM AgNO3 solution without any reducing agent was used as a control. (C) TEM image of the synthesized AgNPs in different culture media. The type of culture media are indicated on top left coner of each image.

Figure 2. (A) O.D values of the reaction after AgNPs synthesis with NB and MHB media without (top) and with light irradiation (down). (B) Size distribution of AgNPs synthesized by NB (blue) and MHB (black), respectively. The synthesis was carried out with light irradiation. (C) FT-IR spectrum of AgNPs synthesized by NB (blue) and MHB media (black).

Figure 3. Digital photograph and corresponding UV/Vis absorption spectra of the reaction after AgNPs synthesis by using culture supernatant and whole bacterial culture in HEPES (A), NB (B) and MHB media (C).

Figure 4. TEM, SAED patterns and DLS analysis of AgNPs synthesized from bacterial cultures in NB (A) and MHB (B) media. TEM images show AgNPs synthesized by using culture supernatant and whole bacterial culture in NB (A) inoculated with K. pneumoniae and E. coli (N-KP C; N-EC C; NKP W; N-EC W), and using that of MHB (B) media (M-KP C; M-EC C; MKP W; M-EC W). The corresponding SAEC patterns and DLS data are shown below. Histograms show the size distribution of the synthesized AgNPs through the condition described above. Solid line and dash line 18

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represent the culture supernatant and whole bacterial culture, respectively.

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Table Table 1. The composition of reducing agents used for the synthesis of AgNPs. Reducing agents Abbreviation Medium

Bacteria

Fraction

AgNO3

None

Whole solution

Cont

Peptone A

None

Whole solution

PA

Beef extract

None

Whole solution

BE

Yeast extract

None

Whole solution

YE

Nutrient broth

None

Whole solution

NB

Nutrient broth

K. pneumoniae 2242

Culture supernatant

N-KP C

Nutrient broth

K. pneumoniae 2242

Whole bacterial culture

N-KP W

Nutrient broth

E. coli DH5α

Culture supernatant

N-EC C

Nutrient broth

E. coli DH5α

Whole bacterial culture

N-EC W

Muller-Hintone broth

None

Whole solution

MHB

Muller-Hintone broth

K. pneumoniae 2242

Culture supernatant

M-KP C

Muller-Hintone broth

K. pneumoniae 2242

Whole bacterial culture

M-KP W

Muller-Hintone broth

E. coli DH5α

Culture supernatant

M-EC C

Muller-Hintone broth

E. coli DH5α

Whole bacterial culture

M-EC W

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Figure Graphics Figure 1

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Figure 2

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Figure 3

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Figure 4

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TABLE OF CONTENTS GRAPHICS

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