碳纳米管复合物电极的构筑及其对嘌呤衍生物的同时测定

Fabrication of Single-wall Carbon Nanotube Compound Conducting Polymer Film Modified Electrode and Simultaneous Voltammetric Determination of Purine Derivatives

以嵌入式超薄碳糊（IUCP）前驱膜为基体,构建了单壁碳纳米管复合聚天青I修饰电极（SWNTs/AZ/IUCP/CME）。以扫描电镜表征其表面形貌,循环伏安法和微分伏安法考察其在黄嘌呤（XA）和次黄嘌呤（HXA）中的响应情况。实验表明,电极对XA和HXA的电化学反应表现出良好的增敏作用,采用微分伏安法测得XA和HXA的氧化峰电流分别与其浓度在2.0×10-7~1.0×10-4mol/L和4.0×10-7~1.0×10-4mol/L范围内呈良好线性关系,检出限分别为6.0×10-7和2.8×10-8mol/L。此电极制备简单,可用于尿样中XA和HXA的同时电化学测定。

A single wall nanotubes（SWNTs） compound poly（azure I）（AZ） modified electrode was prepared at the inlaying ultra-thin carbon paste（IUCP） precursor film.Scanning electron microscope（SEM） and voltammetry were employed to characterize the configuration and electrochemical properties of the electrode.The resulting SWNTs/AZ/IUCPE exhibited excellent electrochemical response to xanthine（XA） and hypoxanthine（HXA）.The oxidation peak currents of XA has good linear relationship in the concentration range of 2.0×10-7 to 1.0×10-4 mol/L,and that of HXA is 4.0×10-7 to 1.0×10-4mol/L.The detection limit is 6.0×10-7mol/L for XA and 2.8×10-8mol/L for HXA.The proposed electrode can be applied to simultaneous determination of of XA and HXA in human urine.