New acylated anthocyanins from purple yam and their antioxidant activity |
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Authors: | Chiemi Moriya Takahiro Hosoya Sayuri Agawa Yasumasa Sugiyama Ikuko Kozone Kazuo Shin-ya |
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Affiliation: | 1. Department of Food and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan;2. Faculty of Fisheries, Bioorganic Chemistry Research Group, Kagoshima University, Kagoshima, Japan;3. Japan Biological Informatics Consortium (JBIC), Tokyo, Japan;4. National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan |
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Abstract: | Purple yam (Dioscorea alata L.), which is widely distributed in tropical and subtropical regions, is characterized by its color and viscosity. Previous studies have shown that purple yams contain a variety of acylated anthocyanins that exhibit higher levels of antioxidant activity than the corresponding nonacylated compounds. In this study, the pigments found in purple yams from the Philippines (D. alata) were isolated and evaluated in terms of antioxidant activity. Four new acylated anthocyanins, alanins (1–4) were isolated from the MeOH extracts of purple yam, which were subsequently determined to be cyanidin (1, 2, and 4) and peonidin (3) type compounds, along with four known anthocyanins (5–8). The structures of 1–4 were determined by spectroscopic methods, including NMR and MS analyses. The antioxidant activities of anthocyanins 1–8 were investigated using oxygen radical absorbing capacity and ferric reducing antioxidant power assays. |
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Keywords: | anthocyanin purple yam the Philippines Dioscorea alata antioxidant activity |
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