辅酶Q在自组装卡托普利金电极上直接电化学和动力学研究

The study of direct electrochemistry and dynamics of CoQ at a captopril self-assembly electrode

发现了一种新的对辅酶 Q(Cyt.c)电子交换有促进作用的试剂卡托普利(CPT),用红外光谱和光电子能谱对 CPT 在金电极表面形成的单分子膜进行了表征。循环伏安实验表明 Cyt.c 在 CPT 修饰金电极上能发生准可逆的电化学反应,式量电位与文献报道一致,异相电子传递速率常数 ks 为6.6×10^(-3)cm/s,对 CPT修饰膜的稳定性进行了考察;讨论了 CoQ 发生电化学反应的异相电子传递速率常数 ks 受电极表面促进剂的修饰量以及空气中氧影响的机制。

The direct electrochemistry of CoQ at microband gold electrode modified with a new promoter captopril （CPT） was investigated. The self- assembly monolayer of DMMP on the surface of gold electrode was characterized by IR spectrum and XPS. Cyclic vohammetric experiments indicated that the electrochemistry of CPT at gold electrode modified with this promoter was quasi- reversible with one- electron transfer reaction. The heterogeneous electron- transfer rate constant, ks, of CPT was evaluated to be ca. 6.6× 10 3 cm/s. The effects of the immersion time and the oxygen in air on the direct electrochemistry of CoQ at the modified electrode were discussed.