氨基酸席夫碱双核铜配合物修饰玻碳电极对抗坏血酸的电催化作用  

Cu(Ⅱ)-Serine Schiff-base Complex Modified Glassy Carbon Electrode and Its Electrocatalysis on Ascorbic Acid

作　　者：王永燎[1] 刘峥[1] 王松梅[1] 高均勇[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004

出　　处：《分析科学学报》2009年第6期673-676,共4页Journal of Analytical Science

基　　金：广西研究生教育创新人才联合培养基地项目

摘　　要：采用电沉积方法将丝氨酸席夫碱双核铜配合物修饰于玻碳（GC）电极表面制得了修饰电极。研究了ECu2L2（4，4’-Bipy）-]／GC电极的电化学性质，并发现该电极对抗坏血酸（AA）具有良好的电催化氧化作用。考察了该电极作为AA传感器的操作条件，结果表明：修饰电极在PH=7．0的磷酸盐缓冲溶液（PBS）中，于-0．70～0．10V的范围内，以50mV·s^-1的扫描速率进行循环伏安扫描，催化电流峰与AA浓度在0．2×10^-4～1．0×10^-4mol·L^-1范围内呈线性关系。这表明可利用该修饰电极对抗坏血酸作定量分析。对2种水果汁饮料中AA进行测定，其果汁含量分别为0．0647g·L^-1和0．125g·L^-1，相对标准偏差在2．4％～3．0％之间。The Shiff-base copper complex was modified on the glassy carbon（GC） electrode through the method of electro-deposition. The electrochemical character of [Cu2 L2 （4,4＇-biPy）]/GC was studied and it was found that this modified electrode had a good catalytic effect on ascorbic acid （AA）. The operating conditions of this modified electrode as AA sensor were studied. The result showed that in phosphate buffer solution （PBS） （pH = 7.0）, the catalytic peak current had a linear relationship with the concentration of ascorbic acid in the range of 0.2 × 10^-4 -1.0 × 10^-4 mol· L^-1 , which indicated that the modified electrode could be used for the quantitative analysis of AA. The modified electrode was used to detect two kinds of fruit juice beverages with RSDs of 2.4%-3.0%.

关 键 词：丝氨酸席夫碱双核铜配合物 修饰玻碳电极 电催化氧化 抗坏血酸 

分 类 号：O657.1[理学—分析化学]