化学修饰电极循环伏安法测定药物和果蔬中抗坏血酸  

Cyclic Voltammetry Determination of Acorbic Acid in Medicine Fruits and Vegetables at Chemical Modified Electrode

作　　者：刘根[1] 赵庆侠[1] 孙登明[1] 

机构地区：[1]淮北师范大学化学与材料科学学院,安徽淮北235000

出　　处：《淮北师范大学学报（自然科学版）》2013年第1期22-27,共6页Journal of Huaibei Normal University：Natural Sciences

基　　金：安徽省高校省级自然科学研究重点项目基金(KJ2011A255)

摘　　要：用循环伏安法制备银掺杂聚L-精氨酸修饰玻碳电极,对抗坏血酸在此电极上的电化学行为进行研究,建立循环伏安法测定抗坏血酸的新方法,在pH 2.5的磷酸盐缓冲溶液中,扫描速率为120 mV/s时,抗坏血酸在修饰电极上,产生一灵敏的氧化峰,峰电位为0.287 V(υs Ag/AgCl),峰电流与抗坏血酸的浓度在5.00×10-6～5.00×10-3mol/L范围内呈良好的线性关系,检出限为1.0×10-6mol/L.用于药物和7种水果蔬菜中的抗坏血酸的测定,结果满意.A silver doped poly（L- argenine acid） modified electrode was prepared by cyclic voltammetric method. The vohammetric behavior and determination method for ascorbic acid were studied on the modified electrode. In pH 2.5 phophate buffer solution, the modified electrode gave a sensitive oxidation peaks at 0. 287 V（vs. Ag/ AgCI） at the scan rate of 120 mV · s^-1. The linear range of the determination of ascorbic acid was 5.00 × 10^-6 ～ 5.00 × 10^-3 mol/L. The detection limit was 1.0×10^-6 mol/L. The method has been successfully applied to the determinination of ascorbic acid in medicine, fruits and vegetables samples with satisfactory results.

关 键 词：L-精氨酸 抗坏血酸 银掺杂 修饰电极 循环伏安法 药物 果蔬 

分 类 号：O657.1[理学—分析化学]