摘要
研究聚茶碱／Nafion双层修饰玻碳电极的制备和其电化学性质，并用于测定多巴胺（DA）。在pH7．4的PBS缓冲溶液中，DA在聚茶碱／Nafion双层修饰玻碳电极上产生一灵敏的氧化峰。峰电流与DA浓度在1×10－7～4×10-4mol/L范围内呈良好线性关系，检出限为5×10－8mol/L。该双层膜对DA有增敏作用，对抗坏血酸（AA）有排斥作用，重现性良好，可用于DA的测定。
The fabrication and electrochemical charecteristics of polytheophlline/Nafion dual-layer modified glassy carbon electrode were investigated, the electrode was applied to the determination of dopamine. In PBS buffer of pH 7 .4, a sensitive oxidation peak was observed at 0. 30 V with the duallayer wodified glassy carbon electrode. The peak current is proportional to the concentraion of dopamine in the range of 1 ×10-7 ~ 4 ×10-4 mol/L, the detection limit is 5×10-8 mol/L. The modified electrode has a well-repeatability and can enhance the sensitivity for the determination of dopamine, and repel the interference of ascorbic acid. This electrode has been shown to be suitable for quantitative determination of dopamine.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期568-572,共5页
Chinese Journal of Analytical Chemistry
基金
河南省自然科学基金
关键词
多巴胺
微分伏安法测定
碳修饰电极
Dopamine, polytheophylline/Nafion dual-layer modified electrode, differential voltammetry
