碳纳米管修饰电极伏安法测定茶碱  

The voltammetric determination of theophylline on carbon nanotube modified electrode

作　　者：张钱丽[1] 陈三多[1] 柯荣锋[1] 

机构地区：[1]苏州科技学院化学与生物工程学院,江苏苏州215009

出　　处：《苏州科技学院学报（自然科学版）》2011年第1期30-33,共4页Journal of Suzhou University of Science and Technology （Natural Science Edition）

基　　金：苏州科技学院科研基金资助项目(Z1332);南京大学"生命分析化学教育部重点实验室"开放课题基金资助项目(KLACLSO8012)

摘　　要：以碳纳米管修饰碳圆盘微电极为工作电极，铂丝为对电极，Ag/AgCl电极为参比电极，研究了茶碱在碳纳米管修饰电极上的电化学行为。化学修饰电极与裸电极相比，电流响应明显提高。在0．01mol·L^-1的硫酸溶液中一0．4V的电压富集30s，阳极化扫描，在1．1V处有一灵敏的氧化峰，氧化峰电流和茶碱浓度在5．0×10^-6-1．0×10^-4mol·L^-1范围呈良好的线性关系，检测限为6×10^-5mol·L^-1。对5．0×10^-5mol·L^-1茶碱进行了6次的连续重复测定，相对标准偏差为1．79％，表明修饰电极稳定性良好，表面易于更新。此法用于茶叶样品中茶碱含量的测定结果满意。A nanotube modified carbon-disc microelectode was reported for the determination of trace amounts of theophylline. The electrochemical behavior of theophylline was studied by cyclic voltmmetry. Compared to a bare electrode, the modified electrode exhibited a marked enhancement of the current response. In 0.01 mol·L^-1 H2SO4 solution, theophyiline was accumulated at -0.4 V for 30 s and the liner range was from 6×10^-6 to 1.06×10^-4 mol·L^-1 with a detection limit of 6×10^-7 mol·L^-1. Six successive determinations of 1.0xl0-5 mol·L^-1 theophylline resulted in a relative standard deviation of 1.79% for the current response, indicating that the electrode renewal gives a good reproducible surface. This method has been applied to the determination of theophylline in samples with satisfied results.

关 键 词：茶碱 碳圆盘微电极 碳纳米管 伏安法 

分 类 号：O657.1[理学—分析化学]