桑叶是药食两用植物资源,桑叶槲皮素是其主要的黄酮类化合物,具有广泛生理活性.为了更深入研究桑叶槲皮素活性作用,文章对桑叶槲皮素抗氧化性展开研究,采用大孔树脂法对桑叶槲皮素提取物进行纯化,并对其抗氧化活性进行研究.结果表明:在还原力、清除DPPH方面桑叶槲皮素纯化物较槲皮素粗提取作用较好;在清除超氧阴离子作用方面,低浓度时粗提物优于纯化物,高浓度时纯化物优于粗提物;在清除羟基自由基作用时,粗提物则表现比纯化物较强的清除作用.%The mulberry leaf is a kind of medicinal and edible plant leaves. Quercetin is the main flavonoids in mulberry leaves,with a wide range of physiological activity. In order to study the activity of quercetin in mulberry leaves,this paper studies the antioxidant activity of quercetin in mulberry leaves. The quercetin extract from mulberry leaves was purified by macroporous resin method,and its antioxidant activity was studied. The results showed that the crude extract of mulberry leaf quercetin was less than purified product in reducing power and eliminating the DPPH;and the crude extract was superior to the purified product in the removal of superoxide anion when the concertration is low, high concentration of the purification was better than the crude extract;in the removal of hydroxyl radicals,the crude extract was better than the purification of the role of purification.
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