ARTICLE pubs.acs.org/JAFC
Metabolite Profiles for Antrodia cinnamomea Fruiting Bodies Harvested at Different Culture Ages and from Different Wood Substrates Ting-Yu Lin,†,‡ Chieh-Yin Chen,†,‡,§ Shih-Chang Chien,|| Wen-Wei Hsiao,§ Fang-Hua Chu,^ Wen-Hsiung Li,# Chin-Chung Lin,O Jei-Fu Shaw,r and Sheng-Yang Wang*,†,||,[ †
Department of Forestry, National Chung-Hsing University, Taichung, Taiwan Experimental Forest, College of Bio-Resources and Agriculture, National Taiwan University, Taiwan The Experimental Forest Management Office, National Chung-Hsing University, Taichung, Taiwan ^ School of Forestry and Resource Conservation, National Taiwan University, Taipei, Taiwan # Biodiversity Research Center, Academia Sinica, Taiwan r Department of Food Science and Biotechnology, Chung-Hsing University, Taichung, Taiwan O Taiwan Leader Biotech Company, New Taipei City, Taiwan [ Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
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§
bS Supporting Information ABSTRACT: Antrodia cinnamomea is a precious edible fungus endemic to Taiwan that has long been used as a folk remedy for health promotion and for treating various diseases. In this study, an index of 13 representative metabolites from the ethanol extract of A. cinnamomea fruiting body was established for use in quality evaluation. Most of the index compounds selected, particularly the ergostane-type triterpenoids and polyacetylenes, possess good anti-inflammation activity. A comparison of the metabolite profiles of different ethanol extracts from A. cinnamomea strains showed silmilar metabolites when the strains were grown on the original host wood (Cinnamomum kanehirai) and harvested after the same culture time period (9 months). Furthermore, the amounts of typical ergostane-type triterpenoids in A. cinnamomea increased with culture age. Culture substrates also influenced metabolite synthesis; with the same culture age, A. cinnamomea grown on the original host wood produced a richer array of metabolites than A. cinnamomea cultured on other wood species. We conclude that analysis of a fixed group of compounds including triterpenoids, benzolics, and polyacetylenes constitutes a suitable, reliable system to evaluate the quality of ethanol extract from A. cinnamomea fruiting bodies. The evaluation system established in this study may provide a platform for analysis of the products of A. cinnamomea. KEYWORDS: Antrodia cinnamomea, fruiting body, metabolites profiling, quality control, anti-inflammation activity
’ INTRODUCTION Antrodia cinnamomea (Syn. Antrodia camphorata and Taiwanofungus camphorata) is a precious edible fungus endemic to Taiwan that has long been used as a folk remedy for treating various diseases including liver diseases, hypertension, abdominal pain, and cancer.13 Owing to its perceived efficacy, the selling price of A. cinnamomea fruting bodies is above US$10,000 per kilogram in several Asian countries.4 Over the past decade, numerous bioactivity studies have investigated the physiology and biochemical and pharmacological properties of A. cinnamomea,516 and many health-promotion functions of the ingredients of A. cinnamomea have been recognized. Although some studies have reported that the health-promotion functions of A. cinnamomea are specifically connected to its growth on the aromatic tree Cinnamomum kanehirai Hayata,1719 the market-driven search for a means to mass produce A. cinnamomea mycelium, as well as cultivate its fruiting bodies, has recently led to the successful cultivation of A. cinnamomea on other tree species besides C. kanehirai. Quality control, efficacy approbation, and safety are important requirements for the development of ethnomedicines into r 2011 American Chemical Society
mainstream international pharmaceutical products. Since the crude material and products of A. cinnamomea have a high market value, in addition to investigations into bioactivity and mass-production technique development, establishing a quality control platform has become a pressing issue for A. cinnamomea products. Zhao and Leung conducted high-performance liquid chromatography (HPLC) coupled with diode array detection and mass spectrometry to evaluate the quality of A. cinnamomea mycelium.20 However, to the best of our knowledge, a protocol for evaluating the metabolite composition of the fruiting bodies of A. cinnamomea has not been established. With regard to the investigation of metabolites, over eighty compounds have been identified in the fruiting body of A. cinnamomea to date. Compared with the type of compound between fruiting body with mycelia, the ergostane-type triterpenoid and polyacetylene Received: February 21, 2011 Accepted: June 13, 2011 Revised: June 9, 2011 Published: June 13, 2011 7626
dx.doi.org/10.1021/jf201632w | J. Agric. Food Chem. 2011, 59, 7626–7635
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Determination of Optimal A. cinnamomea Extraction Time. To evaluate the optimal extraction time for the preparation of
Figure 1. Morphological observations of A. cinnamomea fruiting bodies in this study.
are only found in fruiting body and have never been found in mycelia.2,3 It indicates that ergostane-type triterpenoid and polyacetylene might be used as index compounds for quality control purposes. Over the past few years, different strains of A. cinnamomea have been collected and cultured in our laboratory. Fruiting bodies have been successfully developed and grown on different wood substrates including two broad-leaf trees, Cinnamomum kanehirai (the original host) and C. camphora; and one conifer, Cunninghamia konishii. Here, thirteen compounds representative of A. cinnamomea fruting bodies were selected as index compounds to analyze the metabolite composition of A. cinnamomea produced at different culture ages and grown on different wood substrates. Analyses of the these index metabolites in various strains of A. cinnamomea and grown on various wood substrates for varying periods of time suggest that the profiles of these 13 compounds constitute a suitable, reliable evaluation system of the metabolite composition of A. cinnamomea fruiting body extracts.
’ MATERIALS AND METHODS Antrodia cinnamomea Fruiting Bodies. The A. cinnamomea fruiting bodies analyzed in this study were cultured in the Laboratory of Tree Metabolomics and Natural Medicine, Department of Forestry, National Chung-Hsing University, between June 2008 and December 2009. All the strains of A. cinnamomea were provided and identified by Dr. Wen-Wei Hsiao (Experimental Forest, National Taiwan University). Voucher specimens (AC-3, AC-5, AC-7, AC-9) were deposited in the same laboratory. Four different A. cinnamomea strains, named AC-3, AC5, AC-7, and AC-9, were grown on Cinnamomum kanehirai wood for nine months, and designated as AC-3-9, AC-5-9, AC-7-9, and AC-9-9. AC-9 was also grown on Cinnamomum kanehirai wood for different periods of time. These samples were designated as AC-9-3, AC-9-6, AC9-9, and AC-9-12, representing culture times of 3, 6, 9, and 12 months, respectively. In addition, two further wood species, Cinnamomum camphora (CC) and Cunninghamia konishii (CK), were inoculated with AC-9 and the fruiting bodies were also harvested at nine months. All of the woods used in this study were identified by Professor Sheng-Yang Wang (Department of Forestry, NCHU, Taiwan). The harvested ages for the woods of CC and CK are 20 and 35 years, respectively. These two samples were designated AC-9-9-CC and AC-9-9-CK. Figure 1 shows the morphology of all the fruiting bodies obtained.
the extract for analysis of metabolites, fresh material was lyophilized for 72 h and ground A. cinnamomea powder (particle diameter 99.5%) (Table 2). The ergostane-type 7629
dx.doi.org/10.1021/jf201632w |J. Agric. Food Chem. 2011, 59, 7626–7635
Journal of Agricultural and Food Chemistry
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triterpenoid (R,S)-antcin B was the most aboundant compound in all four different strains, with contents in fruiting bodies ranging from 3.127 mg/g (AC-3-9) to 5.787 mg/g (AC-7-9). Of the lanostane-type triterpenoids, dehydrosulfurenic acid was the most abundant compound, especially in the AC-5-9 strain (content 7.866 mg/g). The AC-5-9 strain contained more antrocamphin A (0.044 mg/g) and antrocamphin C (5.390 mg/g) than the other strains. According to the literature survey and the analysis data obtained in this study, ergostane-type triterpenoids are only found in the A. cinnamomea fruiting bodies. By comparison of the contents of ergostane-type triterpenoids, including of antcin A, antcin B, antcin C, antcin G, antcin H, and antcin K, the result of the statistic showed that the components of AC-3-9, AC-7-9, and
AC-9-9 are similar (Table 2 and Figure 7). The strain AC-5-9 has different composition compared to the other three strains. It had been reported that the ergostane-type triterpenoids possess various bioactivities; by this analysis protocol we can select the strain which could produce the most ergostane-type triterpenoids in the future. Quantification of Index Compounds of A. cinnamomea Fruiting Bodies at Different Ages and Grown on Different Wood Substrates. When the AC-9 strain was grown on the original host, Cinnamomum kanehirai, for varying periods of time (3, 6, 9, or 12 months), various metabolite patterns were seen (Figure 5). In the extract of the AC-9 strain fruiting body harvested at age 3 months (AC-9-3), there were only two significant peaks, compound g (dehydrosulfurenic acid) and
Figure 4. HPLC profiling of index compounds of A. cinnamomea fruiting body and ethanol extracts of four different A. cinnamomea strains (AC-3, AC-5, AC-7, and AC-9) grown on Cinnamomum kanehirai wood for nine months. Peaks: a, (R,S)-antcin K; b, 1,4-dimethoxy-2,3methylenedioxy-5-methylbenzene; c, (R,S)-antcin C; d, antrocamphin A; e, 2,20 ,5,50 -tetramethoxy-3,4,30 ,40 -bimethylenedioxy-6,60 -dimethylbiphenyl; f, (R,S)-antcin H; g, dehydrosulfurenic acid; h, antrocamphin C; i, (R,S)-antcin B; j, (R,S)-antcin G; k, (R,S)-antcin A; l, 15-acetyldehydrosulfurenic acid; m, dehydroeburicoic acid.
Figure 5. HPLC profiling of index compounds of A. cinnamomea fruiting body and ethanol extracts of the same A. cinnamomea strains (AC-9) grown on Cinnamomum kanehirai wood for different months (3, 6, 9 and 12). Peaks: a, (R,S)-antcin K; b, 1,4-dimethoxy-2,3-methylenedioxy-5-methylbenzene; c, (R,S)-antcin C; d, antrocamphin A; e, 2,20 ,5,50 -tetramethoxy-3,4,30 ,40 -bimethylenedioxy-6,60 -dimethylbiphenyl; f, (R,S)-antcin H; g, dehydrosulfurenic acid; h, antrocamphin C; i, (R,S)antcin B; j, (R,S)-antcin G; k, (R,S)-antcin A; l, 15-acetyldehydrosulfurenic acid; m, dehydroeburicoic acid.
Table 2. Quantification of Index Compound Contents from 4 Different Strains of Fruiting Body of A. cinnamomea Grown on Cinnamomum kanehirai Wood for 9 Months content (mg/g dried fruiting bodies)a compound (R,S)-antcin K (a) 1,4-dimethoxy-2,3-methyl-enedioxy-5-methylbenzene (b) (R,S)-antcin C (c) antrocamphin A (d)
AC-3-9 1.956 ( 0.154 b
