首乌叶黄酮抗氧化性能及清除自由基能力的研究

测定了首乌叶黄酮的总体抗氧化能力、清除超氧阴离子自由基能力、清除羟基自由基能力、清除DPPH自由基能力和对卵黄脂蛋白脂质抗氧化能力,并与合成抗氧化剂维生素C(VC)和没食子酸丙酯(PG)进行了比较。结果表明:首乌叶黄酮溶液具有良好的抗氧化效果,在一定浓度范围内,首乌叶黄酮溶液对卵黄脂蛋白脂质抗氧化能力优于VC和PG,其总体抗氧化能力、清除超氧阴离子自由基能力优于PG略低于VC,清除羟自由基能力优于VC低于PG,但清除DPPH自由基能力比VC和PG略弱。

Investigation of antioxidant activities and free radical scavenging of flavonoids in leaves of polygonum multiflorum thunb

In the present research,the flavonoids in leaves of Polygonum multiflorum Thunb was extracted and its total antioxidant activities,superoxide anion,hydroxyl radical scavenging activities,scavenging DPPH radical and antioxidant activities on lipoprotein in yolk were determined and the results were compared with those of ascorbic acid(VC)and synthetic antioxidant,propyl gallate(PG).The results revealed clearly that the flavonoids in the leaves of P.multiflorum possess significant antioxidant activities on lipoprotein in yolk,and it was higher than those of VC and PG.Total antioxidant activities,superoxide anion and hydroxyl radical scavenging activities of the flavonoids were higher than PG and lower than VC.Hydroxyl radical scavenging was higher than VC and lower than PG.DPPH radical scavenging activities was a little lower than those of two antioxidants.