多壁碳纳米管修饰电极分子印迹传感器测定咖啡因  

Determination of Caffeine Using an Electrochemical Sensor Based on the Electropolymerized Molecularly Imprinted Film on a Multi-walled Carbon Nanotube Modified Glassy Carbon Electrode

作　　者：彭友元[1] 

机构地区：[1]泉州师范学院化学与生物科学学院,福建泉州362000

出　　处：《分析测试学报》2013年第12期1427-1432,共6页Journal of Instrumental Analysis

基　　金：泉州市科技局重点项目(2012Z112)

摘　　要：以咖啡因为模板分子,通过电聚合邻苯二胺,在羧基化多壁碳纳米管修饰的玻碳电极表面制备了对咖啡因有特异响应的分子印迹聚合物膜。通过循环伏安法和线性扫描伏安法对传感器的性能进行表征,并优化了检测条件,研究了印迹传感器对模板分子咖啡因及其结构类似物的选择性响应。在最优实验条件下,电化学探针K3[Fe（CN）6]的峰电流与咖啡因浓度在2.0×10^-7~2.0×10^-5mol·L-1范围内呈良好的线性关系,检出限为4.0×10^-8mol·L^-1。该传感器应用于铁观音茶叶中咖啡因含量的测定,其回收率为94%~106%。A sensitive molecularly imprinted electrochemical sensor was fabricated for selective detection of caffeine by electroploymerization of o-phenylenediamine on glassy carbon electrode（ GCE） modified with multi-walled carbon nanotubes（ MWNTs）. The template can be quickly removed in 0. 1 mol·L- 1HCl. The molecularly imprinted sensor was characterized by cyclic voltammetry and linear sweep voltammetry. The molecular imprinted polymer based sensor displayed an excellent recognition capacity toward caffeine. The linear sweep voltammetry peak current was linear in the analyte concentration range of 2. 0 × 10- 7- 2. 0 × 10- 5mol·L- 1,with a detection limit of 4. 0 ×10- 8mol·L- 1. The sensor was applied in the determination of caffeine in Tieguanyin teas,with recoveries of 94%-106%.

关 键 词：碳纳米管 分子印迹 咖啡因 电化学传感器 

分 类 号：O657.3[理学—分析化学] TQ460.72[理学—化学]