A-type procyanidins from Litchi chinensis pericarp with antioxidant activity

被引：106
|
作者：
Liu, Liang [1 ]
Xie, Bijun [1 ]
Cao, Shaoqlan [1 ]
Yang, Erning [1 ]
Xu, Xiaoyun [1 ]
Guo, Shanshan [1 ]
机构：
[1] Cent China Agr Univ, Food Sci & Technol Coll, Wuhan 430070, Peoples R China
来源：
FOOD CHEMISTRY | 2007年 / 105卷 / 04期
关键词：
litchi; procyanidins; identification; antioxidant activity;
D O I：
10.1016/j.foodchem.2007.05.022
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The main oligomeric procyanidins from litchi pericarp, (Litchi chinensis) were isolated and identified. Complete assignment of epicatechin-(4 beta -> 8, 2 beta -> O -> 7)-epicatechin-(4 beta -> 8)-epicatechin structure was obtained using CD, NMR and ESI-MS techniques. The known (-)-epicatechin and procyanidin A2 were also isolated from litchi pericarp. The effects of oligomeric procyanidins, A2 and epicatechin-(4 beta -> 8, 2 beta -> O -> 7)-epicatechin-(4 beta -> 8)-epicatechin from litchi pericarp on free radical-scavenging were determined by using a chemiluminescent method. The results showed that all of them had a strong scavenging effect on 'OH, and the IC50 values were 2.60 mu g/ml, 1.75 mu g/ml and 1.65 mu g/ml for oligomeric procyarridins, A2 and the trimeric procyanidins, respectively. The antioxidant activities of A-type dimeric and trimeric procyanidins seemed to be related to the number of hydroxyls in their molecular structures. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1446 / 1451
页数：6
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