Reactions of tea polyphenol four constituents with hydroxyl radical: A pulse radiolytic study

Using the electron pulse radiolytic techniques, the reactions between hydroxyl radical and tea polyphenol four constituents epigallocatechin gallate (EGCG), epicatechin gallate (ECG), epigallocatechin (EGC) and epicatechin (EC) have been investigated in detail, their corresponding rate constants for...

Full description

Saved in:
Bibliographic Details
Published in:Science China. Chemistry 1998-06, Vol.41 (3), p.295-300
Main Authors: Jiang, Yue, Yao, Side, Lin, Weizhen, Lin, Nianyun, Zhu, Dayuan
Format: Article
Language:English
Subjects:
Absorption spectra
Adducts
Constituents
Hydroxyl radicals
Rate constants
Scavenging
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Using the electron pulse radiolytic techniques, the reactions between hydroxyl radical and tea polyphenol four constituents epigallocatechin gallate (EGCG), epicatechin gallate (ECG), epigallocatechin (EGC) and epicatechin (EC) have been investigated in detail, their corresponding rate constants for scavenging hydroxyl radicals have been determined to be 1.5 × 1010, 1.4 × 1010, 9.7 × 109and 9.2 x 109 dm3-mol−1-s−1, respectively. On the basis of their structures and transient absorption spectra, the OH adducts of EGCG and ECG undergo unimolecular elimination of gallate group.
ISSN:1674-7291
1869-1870
DOI:10.1007/BF02879710