文献类型：期刊文献

英文题名：Quinic acid esters and sesquiterpenes from Sonchus arvensis

作者：Xu, Yang-Jun[1];Sun, Shao-Bo[2];Sun, Li-Mei[1];Qiu, Dong-Feng[1];Liu, Xiu-Jin[1];Jiang, Zhi-Bo[1];Yuan, Cheng-Shan[1]

第一作者：Xu, Yang-Jun

通信作者：Yuan, CS[1]

机构：[1]Lanzhou Univ, State Key Lab Appl Organ Chem, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China;[2]Gansu Coll Tradit Chinese Med, Lanzhou 730000, Peoples R China

第一机构：Lanzhou Univ, State Key Lab Appl Organ Chem, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China

通信机构：[1]corresponding author), Lanzhou Univ, State Key Lab Appl Organ Chem, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China.

年份：2008

卷号：111

期号：1

起止页码：92

外文期刊名：FOOD CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000257049300015)】；

语种：英文

外文关键词：Sonchus arvensis; quinic acid; eudesmanolide; sesquiterpene; DPPH; antioxidant

摘要：A phytochemical study on the whole plant of Sonchus arvensis and its antioxidant activity has been carried out. Three quinic acid derivatives (1-3), the rarely naturally occurring (p-hydroxyphenylacetyl) quinic acids, and two eudesmanolides (4 and 5) were newly found. Four known eudesmanolides (6-9) were isolated from the plant for the first time. Their structures were characterized by HRESIMS, IR, UV, 1D NMR, and 2D NIVIR. 1,1-Diphenyl-2-picrylhydrazyl (DPPH center dot)-scavenging activity was evaluated for each of the above 9 compounds (1-9) in comparison to standard antioxidants (caffeic acid and ascorbic acid). However, none proved to have a positive activity. The absence of antioxidant activity could be caused by the absence of ortho or para-diphenolic groups in all detected compounds, that are responsible of the activity against free radicals by an electron transfer reaction. (C) 2008 Elsevier Ltd. All rights reserved.