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Bijun Xie

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Organization: Huazhong Agricultural University
Department: College of Food Science and Technology
Title:
Degradation of Cyanidin 3-Rutinoside in the Presence of (–)-Epicatechin and Litchi Pericarp Polyphenol Oxidase
Co-reporter:Liang Liu, Shaoqian Cao, Bijun Xie, Zhida Sun and Jinjun Wu
Journal of Agricultural and Food Chemistry 2007 Volume 55(Issue 22) pp:9074-9078
Publication Date(Web):October 4, 2007
DOI:10.1021/jf071931y
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.
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