茶多酚及其单体结构自由基的ESR研究

ESR SPECTROSCOPY STRUCTURAL ANALYSIS OF THE SEMIQUINONE FREE RADICALS OF GREEN TEA POLYPHENOLS AND THEIR COMPONENTS

通过ＥＳＲ检测方法研究了邻苯三酚、茶多酚及其四种单体的自氧化醌类自由基的ＥＳＲ波谱信号。

Green Tea Polyphenols(GTP) consist of four components, EGCG( ) epigallocatechin gallate, ECG( ) epicatechin gallate, EGC( )epigallocatechin, and EC( )epicatechin, all of which have the structure of gallate group or pyrogallol group. In alkaline solution, they will be autooxidized to produce different semiquinone free radicals. We investigated the ESR spectroscopy of the pyrogallol GTP, and the four components of GTP respectively, analyzed the possible structure of responsible semiquinone free radical. The ESR signals of the four components are related to the simple unit of pyrogallol, and the ESR signals of GTP are related to their four components according to their respective quantity attribution.