纳米电极界面的构建和茶碱的直接电氧化测定  

Fabrication of nanoscale electrochemical interface and the direct determination of theophylline

作　　者：乔海燕[1] 汪振辉[1] 王栋[1] 黄爱平[1] 陈体伟[1] 

机构地区：[1]河南师范大学化学与环境科学学院,新乡453007

出　　处：《分析试验室》2009年第10期5-8,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(20675026)项目资助

摘　　要：以镍铬合金为基体制备嵌入式超薄碳糊前驱膜,然后在薄膜表面构筑单壁碳纳米管/聚L—酪氨酸复合电极。SEM结果表明膜表面的碳纳米管复合物呈立体枝状渗透性结构,电化学实验证明表面膜上的复合纳米结构改变了基体的电化学性质,使之可用作研究电极。以茶碱为目标物考察其在该电极上的伏安行为,在0.1 mol/L的HClO4底液中,茶碱的2.5次微分峰电流与其浓度在1.0×10^-6-8.0×10^-4mol/L范围内呈良好的线性关系,相关系数为0.9971,方法可用于茶碱的定量测定。An inlaying ultra-thin carbon paste precursor film was prepared firstly onto nichrome substrate,and then a single-wall carbon nanotubes compound poly-L-Tyrosine modified electrode（SWNTs/PTICPE） was formed on the thin film.SEM was employed to characterize the electrode surface.The electrochemical behavior of theophylline at the SWNTs/PTICPE was investigated by multiple semi-differential voltammetry.The result showed that a configuration of three-dimensional,ramiform and stereo porous interspaces was formed at the electrode surface. The SWNTs/FHCPE exhibited a marked enhancement of the current response for theophylline electro-oxidation compared to SWNTICPE and PTICPE. The multiple semi-differential peak current was proportional to the concentration of theophylline over the range of 1.0×10^-6-8.0×10^-4mol/L. The proposed procedure could be used for the determination of theophylline in drug with satisfactory results.

关 键 词：单壁碳纳米管 L-酪氨酸 茶碱 伏安法 

分 类 号：O657.1[理学—分析化学]