Han Xiao-xia, Gao Zuo-ning
Ningxia Key laboratory of Energy Sources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China.
Yao Xue Xue Bao. 2007 Apr;42(4):413-7.
Sodium dodecyl benzenesulfonate (SDBS) self-assembled monolayers in situ modified electrode (SDBS/CPE) was prepared. The electrochemical behaviors of dopamine (DA) on SDBS/CPE were studied. Electrochemical behaviors and kinetic parameters of DA were investigated at SDBS/CPE by cyclic voltammetry (CV), chronoamperometry (CA) and chronocoulometry (CC). The changes of the oxidation peak currents with concentration of DA were examined by square wave voltametry (SWV). The difference of peak potential at CPB/CPE was less than 149 mV comparing with that at CPE. The charge transfer coefficient alpha, diffusion coefficient D and the apparent reaction rate constant k(f) are 0.61, 3.6 x 10(-5) cm2 x s(-1) and 4.2 x 10(-3) cm x s(-1), respectively. The oxidation peak currents of DA versus its concentration have a good linear relationship in the concentration range of 2.0 x 10(-6)-1.0 x 10(-3) mol x L(-1) with the correlation coefficient of 0.9979 and the detection limit of 9.0 x 10(-7) mol x L(-1) by square wave voltammetry (SWV) response. The modified electrode showed an excellent electrocatalytic activity for the DA electrochemical oxidation. The method can be applied in the determination of DA in injection samples with the satisfactory results.
制备了十二烷基苯磺酸钠（SDBS）自组装单分子原位修饰电极（SDBS/CPE）。研究了多巴胺（DA）在SDBS/CPE上的电化学行为。采用循环伏安法（CV）、计时电流法（CA）和计时库仑法（CC）研究了DA在SDBS/CPE上的电化学行为和动力学参数。通过方波伏安法（SWV）考察了DA氧化峰电流随浓度的变化。与裸碳糊电极（CPE）相比，CPB/CPE处的峰电位差小于149 mV。电荷转移系数α、扩散系数D和表观反应速率常数k(f)分别为0.61、3.6×10(-5) cm2×s(-1)和4.2×10(-3) cm×s(-1)。在2.0×10(-6)-1.0×10(-3) mol×L(-1)浓度范围内，DA的氧化峰电流与其浓度具有良好的线性关系，方波伏安法（SWV）响应的相关系数为0.9979，检测限为9.0×10(-7) mol×L(-1)。修饰电极对DA的电化学氧化表现出优异的电催化活性。该方法可用于注射剂样品中DA的测定，结果令人满意。
