核黄素在玻碳电极上的电化学行为  

Electrochemical Behavior of Riboflavin on Glassy Carbon Electrode

作　　者：李红[1] 江琳才[1] 计亮年[2] 

机构地区：[1]华南师范大学化学系 [2]中山大学化学与化工学院

出　　处：《电化学》1999年第2期171-177,共7页Journal of Electrochemistry

摘　　要：用电位扫描、旋转环盘电极和微分电容等方法研究了核黄素在玻碳电极上的电化学行为．在ｐＨ＜６的介质中，观察到一个典型的氧化还原波，它是可逆的二电子反应，其还原产物ＲＦＨ２在电极上的吸附为弱吸附，溶出性能良好，在６＜ｐＨ＜１０的介质中，出现两个分离但仍有部分重叠的氧化还原波，相应于两步单电子反应，还原所生成的ＲＦＨ和ＲＦＨ２发生强吸附，很难溶出．在ｐＨ＞１０的介质中，仍然出现两个分离但有部分重叠的氧化还原波。The electrochemical behavior of riboflavin(RF) on glassy carbon has been investigated by using potential sweep,rotating ring_disc electrode and the measurement of differential capacitance. It is shown that a single well_behaved oxidation_reduction wave corresponding to a reversible two_electrons reaction apears in medium of pH<6,and the adsorption of RFH2 formed by electro_reduction is weak and hence its solubility is good.In medium of pH>6,there are two separating but overlapping partly oxidation_reduction waves corresponding to two_step one_electron reaction.The adsorptions of RFH and RFH2 produced by reduction reactions in medium of 6<pH<10 are strong and their solubilities are poor.However,in medium of pH>10,the solubilities of the adsorbed species produced by electro_reduction are good.

关 键 词：核黄素 电化学还原 玻碳电极 吸附 氧化还原 

分 类 号：Q563.202[生物学—生物化学]