Degradation of Cyanidin 3-Rutinoside in the Presence of (–)-Epicatechin and Litchi Pericarp Polyphenol Oxidase

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• 作者：Liang Liu ; Shaoqian Cao ; Bijun Xie ; Zhida Sun ; Jinjun Wu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：October 31, 2007
• 年：2007
• 卷：55
• 期：22
• 页码：9074 - 9078
• 全文大小：130K
• 年卷期：v.55,no.22(October 31, 2007)
• ISSN：1520-5118

文摘

The degradation mechanism of cyanidin 3-rutinoside in the presence of (−)-epicatechin and litchi pericarp polyphenol oxidase (PPO) was investigated using several model systems. The enzymically generated (−)-epicatechin o-quinone could induce cyanidin 3-rutinoside degradation. The results obtained in this study allowed us to propose a pathway for cyanidin 3-rutinoside degradation in the presence of (−)-epicatechin and litchi pericarp PPO. First, enzymatic oxidation of (−)-epicatechin produced the corresponding o-quinone, and then cyanidin 3-rutinoside and (−)-epicatechin competed for (−)-epicatechin o-quinone, resulting in degradation of cyanidin 3-rutinoside and regeneration of (−)-epicatechin. Moreover, the results of kinetic studies indicated this competition was influenced by both (−)-epicatechin concentration and cyanidin 3-rutinoside concentration in the model system.