Voltammetric Determination of Caffeine at Pt/Carbon Nanotubes Composite Modified Glassy Carbon Electrode

被引：0
|
作者：
Wei, Yingliang [1 ,2 ]
Zhang, Luping [2 ]
Shao, Chen [2 ]
Li, Chao [2 ]
机构：
[1] Luoyang Inst Sci & Technol, Dept Environm Engn & Chem, Luoyang 471023, Peoples R China
[2] Zhengzhou Univ Light Ind, Dept Mat & Chem Engn, Zhengzhou 450002, Peoples R China
来源：
CHEMIA ANALITYCZNA | 2009年 / 54卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Caffeine; Carbon nanotubes; Platinum nanoparticles; Modified electrode; Electrocatalysis; COFFEE;
D O I：
暂无
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Platinum nanoparticles (Pt) supported on carbon nanotubes (CNTS) were used to modify glass), carbon electrode (GCE) in order to determine caffeine In 0 01 roof L-1 H2SO4 solution, the modified electrode (Pt-CNTs-GCE) showed obvious electrocatalytic activity towards oxidation of caffeine. The oxidation peak current increased significantly and the oxidation potential shifted negatively. All experimental parameters were optimised The magnitude of the oxidation peak current of caffeine was proportional to its concentration over the range 1 0 x 10(-6)- 10 x 10(-4) mol L-1 and detect ion limit was 2 x 10(-7) mol L-1 Relative standard deviation (RSD) of seven replicate determinations of 1 x 10(-5) mol L-1 caffeine was 2 03%. The proposed method was applied to the determination of caffeine in real samples with the recovery in the range from 96 5% to 102%
引用
收藏
页码：607 / 617
页数：11
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