Oxidation products of cyanidin 3-O-β-d-glucoside with a free radical initiator |
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Authors: | Takanori Tsuda Katsumi Ohshima Shunro Kawakishi Toshihiko Osawa |
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Affiliation: | (1) Food Research Institute, Aichi Prefectural Government, Japan;(2) Department of Applied Biological Sciences, Nagoya University, 464 -01 Nagoya, Japan;(3) Tokaigakuen Women’s College, 2-901 Nakahira, Tenpaku-ku, 468 Nagoya, Japan |
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Abstract: | Recently, we have reported that anthocyanins show strong antioxidative activity, but no attention has been paid to anthocyanins from the viewpoint of the reaction mechanism of alkylperoxyl radicals; therefore, we investigated the reaction products of antioxidative anthocyanins (cyanidin 3-O-β-d-glucoside). Cyanidin 3-O-β-d-glucoside was reacted with 2,2′-azobis(2,4-dimet hylvaleronitrile) to generate the alkylperoxyl radicals, and the reaction products were isolated by high-performance liquid chromatography. The products were identified as 4,6-dihydroxy-2-O-β-d-glucosyl-3-oxo-2,3-dihydrobenzofuran and protocatechuic acid. Based on reaction products, the antioxidative mechanism of cyanidin 3-O-β-d-glucoside may be different from that of α-tocopherol; cyanidin 3-O-β-d-glucoside would produce another radical scavenger, as it would break down the structure and scavenge the radicals. |
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