中文摘要：

为探讨不同结构黄酮醇化合物的氧化机理及其抗氧化性构效关系,对杨梅素和二氢槲皮素的氧化过程进行循环伏安法和原位薄层长光程紫外-可见光谱电化学测试,并与槲皮素氧化的随后转化机理进行比较。结果表明,杨梅素的氧化亦遵守随后转化机理,但其分子中B环5＇-OH的存在对随后转化步骤有阻碍作用,导致抗氧化性减弱;二氢槲皮素分子中C环2,3位C-C饱和键则完全阻断了随后转化步骤的进行,从而导致抗氧化性大幅度减弱。可见随后转化步骤对黄酮醇抗氧化活性具有十分重要的贡献。

英文摘要：

To understand the relationship between structure and antioxidant activity of flavonols,cyclic voltammetry and UVvisible spectroelectrochemical method in situ were used to investigate electro-oxidation mechanisms of myricetin and dihydroquercetin through the comparison with electrochemical-chemical mechanism of quercetin.Results indicated that 5＇-OH at the B-ring of myricetin hindered the subsequent chemical transformation to a certain extent,while C-C saturated bond at 2,3 positions in dihydroquercetin completely stopped the subsequent transformation step,thus leading to the decrease in antioxidant activity.These findings suggest that the subsequent chemical transformation provide very important contribution to antioxidant activity of flavonols.