Identification of A-series oligomeric procyanidins from pericarp of Litchi chinensis by FT-ICR-MS and LC-MS

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• 作者：Shuyi Li^a ; ^{lishuyisz@sina.com} ; Juan Xiao^a ; Lu Chen^b ; Chonglin Hu^a ; Peng Chen^a ; Bijun Xie^a ; Zhida Sun^a ; ^{sunzhida@mail.hzau.edu.cn}
• 关键词：Litchi pericarp ; A-series procyanidin ; FT&ndash ; ICR&ndash ; MS ; LC-ESI-MS ; Antioxidant activity
• 刊名：Food Chemistry
• 出版年：2012
• 期刊代码：48_03088146
• 类别：abs
• 出版时间：1 November, 2012
• 卷：135
• 期：1
• 页码：31-38
• 文件大小：535 K

摘要

Procyanidin oligomers from litchi pericarp (Litchi chinensis) were isolated and identified by online analysis. Accurate molecular weight (MW) distribution and composition of the procyanidin extracts were recorded on an Apex-Qe-FT-ICR mass spectrometer. The MW range of litchi procyanidins was from 289.07151 to 1439.30529 m/z and composed of A- and B-series oligomeric procyanidins. The variety of the main procyanidins (DP < 5) was identified by HPLC and LC-ESI-MS analysis. There are more than 41.7%of A-series procyanidins in the oligomeric procyanidins, however, B-series procyanidins takes only 24.1%of the litchi pericarp extracts. In this study, we determined the effects of (鈭?-epicatechin, A-type procyanidin dimer (A2) and trimer, epicatechin-(4尾鈫?, 2尾鈫扥鈫?)-epicatechin-(4尾鈫?)-epicatechin from litchi pericarp on free radical scavenging. The results showed that A-type procyanidin dimer and trimer both had a strong scavenging ability on DPPH ^{and OH, indicating that litchi is a new plant source of A-type procyanidins and natural antioxidant.}