表没食子儿茶素没食子酸酯对活性氧的抑制作用

生物体内的活性氧(Reactive oxygen species,ROS)过量引起氧化应激将导致脂质、DNA和蛋白质氧化损伤,从而引发一系列生理和病理反应。绿茶中茶多酚的主要成分表没食子儿茶素没食子酸酯((-)-Epigallocatechin-3-gallate,EGCG)具有强抗氧化性,能有效抑制ROS。本文简要介绍了生物体内ROS的来源和EGCG的特性及其对ROS的抑制作用。通过检测玫瑰红水溶液在光敏化时所产生~1O_2的1 270 nm近红外发光,分析比较了EGCG和迭代钠(NaN_3)对~1O_2发光的淬灭过程,发现EGCG对~1O_2的淬灭效果比NaN_3更好,为EGCG淬灭~1O_2的定量研究提供理论依据。

Inhibitory Effects of (-)-Epigallocatechin-3-gallate on Reactive Oxygen Species

Reactive oxygen species (ROS)overproduction could cause oxidative stress,leading to oxidative damage of lipids,DNA and protein,and also triggering a series of physiological and pathological reactions.(-)-Epigallocatechin-3-gallate (EGCG)is the main component of polyphenols in green tea,which has a strong antioxidant activity and could ef-fectively inhibit the generation of ROS.In this paper,the origination and physiological role of ROS,and the characteris-tics of EGCG and its inhibited effects on ROS will be introduced.In addition,the quenching effects of EGCG on singlet oxygen (1 O2 )generation during photosensitization of Rose Bengal (RB)in aqueous solution has been investigated by the direct detection of 1 O2 luminescence at 1 270 nm,the quench effects of EGCG and sodium azide (NaN3 )for 1 O2 was comparatively analyzed.It was concluded that the quenching effects of EGCG on 1 O2 was superior to NaN3 ,provi-ding a theoretical basis for quantitative study of EGCG quenching effects on 1 O2 .