%0 Journal Article
%T Reaction of hydroxyl radical with phenylpropanoid glycoside and its derivatives by pulse radiolysis
%A SHI Yimin
%A <br>石益民
%A 王文锋
%A 康九红
%A 师彦平
%A 贾忠建
%A 王瑛
%A 苏保宁
%A 姚思德
%A 林念芸
%A 郑荣梁
%J 中国科学C辑(英文版)
%D 1999
%I Springer
%X The reaction of hydroxyl radical with 1 phenylpropanoid glycoside (PPG), cistanoside C, and its 3 derivatives: 1-0-β-D-2-(p-hydroxyphenyl)-ethanyl-glucose, 6-O-(E)-femloyl-glucose and 6-O-(E)-p-hydroxy-cinnarnoylglucose isolated from folk medicinal herbs was investigated by pulse radiolysis technique respectively. The reaction rate constants were determined by analysis of built-up trace of absorption at λmax of specific transient absorption spectra of PPG and its derivatives upon attacking · OH. All four compounds react with · OH at close to diffusion controlled rate (1. 03 × 109-19.139 × 109 L · mol 1 · s 1), suggesting that they are effective · OH scavengers. The results demonstrated that the numbers of phenolic hydroxyl groups of PPG and its derivatives are directly related to their scavenging activities. By comparing the reaction rates of · OH with 1-O-β-D-2-(p-hydroxyphenyl)-ethanyl-glucose, 6-O-(E)-feruloyl-glucose or 6-O-(E)-p-hydroxy-cinnomoyl-glucose, it is evident that the phenylethyl group is more impofiant than phenylacryloyl group for scavenging · OH. Project supported partly by the National Natural Science Foundation of China, the Doctoral Programme of the Minister of Ed-ucation of China, the China Postdoctoral Sciences Foundation, and the Laboratory of Radiation Chemistry, Chinese Academy of Sciences.
%K phenylpropanoid glycoside
%K cistanoside C
%K phenylethyl
%K phenylacryloyl
%K hydroxyl radical
%K scavenging activity<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=180CF3A72E750F3261A8A60EDC957784&aid=7D6B95FBFC024F0E701FEF0F121B27B3&yid=B914830F5B1D1078&vid=ECE8E54D6034F642&iid=E158A972A605785F&sid=5335AD3CFE6E14EA&eid=BA48F0B914ED890A&journal_id=1674-7305&journal_name=ScienceChina.Lifesciences&referenced_num=0&reference_num=0