玻碳电极上多巴胺的氧化还原机理  

Redox Mechanism of Dopamine at GC Electrode

作　　者：冶保献[1] 李风菊[2] 张俊[1] 靳保辉[1] 

机构地区：[1]郑州大学化学系,郑州450052 [2]郑州教育学院,郑州450052

出　　处：《化学研究》2003年第1期44-46,50,共4页Chemical Research

基　　金：河南省自然科学基金项目(0211020400).

摘　　要：用电化学方法和光谱电化学方法详细研究了多巴胺(DA)在玻碳(GC)电极表面的反应机理.结果表明DA的电氧化是一个单电子转移过程而不是一个双电子转移过程,在此过程中有半醌自由基中间体存在.用多种电化学手段测定了电极反应动力学参数,提出了新的电极反应机理.The dopamine redox mechanism on GC electrode surface was studied by electrochemical and spectroelectrochemical techniques. The results indicate that the electrooxidation of DA is an oneelectron transfer process other than a twoelectron transfer process reported in literature. The intermediate of osemiquinone free radical exists in this process. Cyclic voltammetry shows quasireversible process by cyclic potential scanning between -0.1 V and 0.6 V. The saturated adsorption amount and reaction rate constant ks were investigated with various electrochemical methods.

关 键 词：玻碳电极 多巴胺 氧化还原机理 电分析化学 神经递质 

分 类 号：Q42[生物学—神经生物学]