聚亮甲酚蓝修饰碳纤维微电极及催化性能研究

用循环伏安法研究了亮甲酚蓝在活化的碳纤维微电极上电聚合成膜的方法和条件，并对该聚合膜修饰电极的电化学性质进行了探讨．该膜修饰的电极对多巴胺和维生素C有较强的催化作用，催化峰电流与底物浓度在一定范围内呈线性关系．并且，在一定的条件下，该膜修饰电极能有效消除多巴胺和维生素C的相互干扰，使多巴胺和维生素C的催化峰电位差达250mV，可用于多巴胺和维生素C的同时测定．用这种微电极对注射液中的多巴胺进行测定，回收率为96．7％～101．3％．该检测过程无需除氧，可望用于活体分析．

Poly(Brilliant Cresyl Blue) Modified Fibre Microelectrodes and Its Catalytic Properties

The electrochemical polymerization of Brilliant cresyl blue (BCB) at the carbon fiber microelectrode (CFME) and the electrochemical properties of resulting films are investigated in cyclic voltammogram (CV). The modified electrode shows a catalytic ability to the voltammetric response of dopamine (DA) and ascorbic acid (AA). The catalytic peak currents are linearly related to both DAand AA concentrations in the ranges of 7. 0×10-5mol/L～1. 0×10-3mol/L and 2. 0×10-5mol/L～ 1.3 ×10-3mol/L, respectively. In addition, the difference of the catalytic peak potentials of DA and AA reaches to 250mV. The mutual interference of DA and AA can be avoided so that the electrode can be used as probes to determine DA and AA simultaneously. The recovery of detected DA injection is 96.7%～101.3%. More importantly, this analytical process can be performed without deaeration, it is an indispensable condition for in vivo studies.