【作者】 王学亮； 李小春； 郁章玉；

【Author】 Wang Xueliang;Li Xiaochun;Li Jinjin;Yu Zhangyu;Department of Chemistry and Chemical Engineering,Heze University;Department of Chemistry and Chemical Engineering,Qufu Normal University;

【机构】 菏泽学院化学与化工系； 曲阜师范大学化学科学院；

【摘要】 <正>本文通过循环伏安法将L-天冬氨酸聚合修饰于玻碳电极表面,修饰电极对于多巴胺和去甲肾上腺素的电化学氧化还原反应表现出了良好的催化性能(见图1A)。图1是多巴胺和去甲肾上腺素在聚L天冬氨酸修饰玻碳电极(PL-ASP/GCE)上的循环伏安图。由图可知多巴胺在裸玻碳电极(GCE)上(曲线a)没有明显的氧化还原峰,而在PL-ASP/GCE电极上(曲线c)有一对灵敏的可逆的氧化还原峰;PL-ASP/GCE电极在磷酸盐缓冲液(PBS)中无氧化还原峰电流(曲线b),更多还原

【Abstract】 This paper reports a convenient and sensitive method for voltammetric determination of dopamine(DA) and norepinphrine(NE) based on poly(L-aspartic acid) modified glassy carbon electrode(GCE). The modified electrode exhibits excellent electro-catalytic activities for the oxidation–reduction of DA and NE, and eliminating the interference of ascorbic acid(AA) and uric acid(UA). Factors influencing the detection processes were optimized and kinetic parameters were calculated. Under the optimal conditions, the anodic peak currents of DA and NE were linear with their concentration, and respectively, the detection limits(S/N=3) are 1.0×10-9 mol L-1 for DA and 4.31×10-9 mol L-1 for NE. Compared with other electrochemical methods reported, this method is simplicity, high selectivity and sensitivity.更多还原