A-type procyanidins from Litchi chinensis pericarp with antioxidant activity

作者：Liu Liang; Xie Bijun^*; Cao Shaoqlan; Yang Erning; Xu Xiaoyun; Guo Shanshan

来源：Food Chemistry, 2007, 105(4): 1446-1451.

DOI：10.1016/j.foodchem.2007.05.022

• litchi
• procyanidins
• identification
• antioxidant activity

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.

• 出版日期2007
• 单位华中农业大学