Isolation and identification of antioxidant phenylpropanoids from the fruit peel of <i>Akebia trifoliata</i> koidz

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  • Kadowaki Wataru
    Department of Food and Nutritional Sciences, University of Shizuoka
  • Sugahara Yuki
    Department of Food and Nutritional Sciences, University of Shizuoka
  • Toyoizumi Tomoyasu
    Shizuoka Prefectural Research Institute of Agriculture and Forestry Shizuoka Prefectural Research Institute of Agriculture and Forestry, Tea Research Center
  • Nakajima Teruko
    Shizuoka Prefectural Research Institute of Agriculture and Forestry Shizuoka Prefectural Research Institute of Agriculture and Forestry, Fruit Tree Research Center
  • Kumazawa Shigenori
    Department of Food and Nutritional Sciences, University of Shizuoka

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<p>In the course of screening for antioxidant agricultural products in Shizuoka Prefecture, Japan, we found that Akebia trifoliata Koidz fruit had a high activity. Furthermore, we found that the peel of A. trifoliata showed remarkable antioxidant activity compared to other parts of the fruit. We isolated seven known phenylpropanoids, including caffeoylquinic acids from the peel of A. trifoliata: 5-O-caffeoylquinic acid (1), 4-O-caffeoylquinic acid (2), 3-O-caffeoylquinic acid (3), 4,5-di-O-caffeoylquinic acid (4), 3,5-di-O-caffeoylquinic acid (5), calceolarioside B (6), and (4-hydroxyphenyl)-ethyl-6-O-(E)-caffeoyl-β-d-glucopyranoside (7). These isolated compounds were found to contribute to the antioxidant activity of the peel, with 6 exhibiting the strongest activity amongst them. Quantitative analyses showed that 6 is abundant in the peel of A. trifoliata. Therefore, the peel of A. trifoliata can be effectively used as a functional material with antioxidant activity.</p>

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