摘要
基于β环糊精和碳纳米管可通过范德华力形成复合物，利用壳聚糖分子以静电引力吸附富集碳纳米管-β环糊精，采用层层自组装制备了β环糊精．碳纳米管／壳聚糖玻碳修饰电极，并研究了多巴胺在修饰电极上的电化学行为。在抗坏血酸和多巴胺共存体系中，二者的氧化峰电位相差约163mv，据此建立了多巴胺的电化学选择性测定，峰电流与浓度在1．0×10^-6～7．0×10^-5mol／L范围内呈良好的线性关系，检出限为0．3umol／L。
A β-cyclodextrin ＋ muhiwalled carbon nanotubes/chitosan modified electrode was successfully prepared by layes-by-layer self-assembly technique （LbL SA）. The durability of this self-assemble-modified electrode was characterized. The electrochemical behavior of dopamine （DA） at the self-assembled electrode was also studied. DA was determined in the co-existing system of ascorbic acid （AA）, where the potential difference of two separated cathodic peaks was about 163 inV. The oxidation peak current was proportional to the concentration of DA from 1.0 × 10^-6 to 7.0 × 10^-5 tool/L, and the detection limit was 0.3umol/L.
出处
《分析试验室》
CAS
CSCD
北大核心
2009年第9期5-8,共4页
Chinese Journal of Analysis Laboratory
基金
高等教育博士专项基金(20050532008)
湖南省科技厅项目基金(2006FJK3182)项目资助
关键词
Β环糊精
多壁碳纳米管
壳聚糖
多巴胺
抗坏血酸
自组装膜
β-cyclodextrin
Multiwalled carbon nanotubes
Chitosan
Dopamine
A scorbic acid
Self-assembled monolayer
