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Antioxidant activities and contents of polyphenol oxidase substrates from pericarp tissues of litchi fruit

文献类型： 外文期刊

作者： Sun, Jian 2 ; Jiang, Yueming 1 ; Shi, John 4 ; Wei, Xiaoyi 1 ; Xue, Sophia Jun 4 ; Shi, Jinyu 1 ; Yi, Chun 1 ;

作者机构： 1.Chinese Acad Sci, S China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China

2.Guangxi Acad Agr Sci, Inst Hort Res, Nanning 530007, Peoples R China

3.Zhejiang Gongshang Univ, Coll Food Sci & Biotechnol & Environm Engn, Hangzhou 310035, Zhejiang, Peoples R China

4.Agr & Agri Food Canada, Guelph Food Res Ctr, Guelph, ON N1G 5C9, Canada

关键词： polyphenol oxidase;litchi;fruits;substrates;content;antioxidant activity

期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： The experiments were performed to extract and purify substrates for polyphenol oxidase (PPO) from pericarp tissue of postharvest litchi fruit. Two purified PPO substrates were identified as (-)-epicatechin and procyanidin A2. The antioxidant properties of two PPO substrates were further evaluated in the present study. Variation in the content of the major substrate (-)-epicatechin of litchi fruit during storage at 25 ℃ was analysed using the HPLC-UV method. The results showed that (-)-epicatechin exhibited stronger antioxidant capability than procyanidin A2, in terms of reducing power and scavenging activities of DPPH radical, hydroxyl radical and superoxide radical. Furthermore, (-)-epicatechin content in pericarp tissue tended to decrease with increasing skin browning index of litchi fruit during storage at 25 ℃. Thus, these two compounds can be used as potential antioxidants in litchi waste and the fresh pericarp tissue of litchi fruit exhibited a better utilisation value.

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