富硒茶叶中茶多糖的某些化学性质及对羟自由基的清除作用

Chemical properties and scavenging effects on active oxygen radicals of tea polysaccharides

研究了茶多糖 (TPS)的某些化学性质及其对活性氧自由基的清除作用。结果表明 :TPS是一类与蛋白质结合在一起的酸性糖蛋白 ,其多糖部分是由阿拉伯糖、核糖、木糖、葡萄糖及半乳糖组成 ;在 D-脱氧核糖—铁体系中 ,TPS(8.5～ 170 ) m g/ L对· OH的清除率为 5 .5 %～ 74.7%。

The chemical composition and scavenging effects of a kind of glycoprotein from tea on active oxygen free radicals were studied. The tea polysaccharides(TPS) were composed of arabinose, ribose, xylose, glucose and galactose. TPS(8 5～170mg/L) could scavenge the ·OH produced in deoxyribose Fe 2+ reaction and the scavenging rate was between 5 5% to 74 7%.