2,2-diphenyl-1-picrylhydrazyl radical-scavenging active components from Polygonum multiflorum Thunb.

被引:239
作者
Chen, Y [1 ]
Wang, MF [1 ]
Rosen, RT [1 ]
Ho, CT [1 ]
机构
[1] Rutgers State Univ, Cook Coll, Dept Food Sci, New Brunswick, NJ 08901 USA
关键词
Polygonum multiflorum Thunb; free radical; antioxidant activity; 2,3,5,4 '-tetrahydroxystilbene 2-O-beta-D-glucopyranoside;
D O I
10.1021/jf990092f
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
An activity-directed fractionation and purification process was used to identify the antioxidative components of Polygonum multiflorum Thunb. (PM). Dried root of PM was extracted with 95% ethanol and then separated into water, ethyl acetate, and hexane fractions. Among these only the ethyl acetate phase showed strong antioxidant activity by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) test when compared with water and hexane phases. The ethyl acetate fraction was then subjected to separation and purification using silica gel column chromatography and Sephadex LH-20 chromatography. Three compounds showing strong antioxidant activity were identified by spectral methods (H-1 NMR, C-13 NMR, and MS) and by comparison with authentic samples to be gallic acid, catechin, and 2,3,5,4'-tetrahydroxystilbene 2-O-beta-D-glucopyranoside.
引用
收藏
页码:2226 / 2228
页数:3
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