【摘要】 采用自组装方法制备了卡托普利(CPT)修饰电化学传感器,并对其在金电极表面形成的单分子膜进行了表征。循环伏安试验结果表明,辅酶Q在CPT修饰电极上能发生准可逆的电化学反应。该传感器对辅酶Q测定具有良好的响应,测定范围为5.0×10-6~6.0×10-5mol.L-1,检出限为2.0×10-6mol.L-1,异相电子传递速率常数ks为5.4×10-3cm.s-1。对CPT修饰膜的稳定性进行考察,讨论辅酶Q发生电化学反应的异相电子传递速率常数ks及其影响机制。更多还原

【Abstract】 An electrochemical sensor of captopril(CPT) modified,selfassembled Au-electrode was prepared,and the formation of mono-molecular membrane on the surface of Au-electrode was characterized.As shown by the results of the study of electrochemical behavior of coenzyme Q(CZM Q) at the CPT modified electrode,the electrode reaction was an one electrontransferring quasi-reversible reaction,and linear response in the concentration range of 5.0×10~-6-6.0×10~-5mol·L~-1 of CZM Q was obtaioned,with a detection limit of 2.0×10~-6mol·L~-1.The constant of rate of heterogeneous electron-transfer(k_s) was determined and its value calculated by the Nicholson method was 5.4×10~-3cm·s~-1,and the mechanism of factors affecting the value of k_s of electrode reaction of CZM Q at the electrode was discussed.Conditions affecting the stability of the CPT modified electrode was also examined.更多还原