Single-walled carbon nanotube-ionic liquid paste electrode for the sensitive voltammetric determination of folic acid

被引：151
|
作者：
Xiao, Fei [1 ]
Ruan, Changping [1 ]
Liu, Lihong [1 ]
Yan, Rui [1 ]
Zhao, Faqiong [1 ]
Zeng, Baizhao [1 ]
机构：
[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2008年 / 134卷 / 02期
关键词：
Folic acid; Ionic liquid; Single-walled carbon nanotube; Voltammetric behavior;
D O I：
10.1016/j.snb.2008.06.037
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A single-walled carbon nanotube (SWNT) paste coated glassy carbon electrode (GCE) has been prepared by using room temperature ionic liquid (i.e. 1-octyl-3-methylimidazolium hexafluorophosphate, OMIMPF6) as a binder. The electrode (i.e. OMIMPF6-SWNT/GCE) combines the features of carbon nanotube and room temperature ionic liquid. Folic acid (FA) can exhibit a very sensitive anodic peak at 0.75 V (vs SCE) in pH 5.5 phosphate buffer solutions, resulting from the irreversible oxidation of FA. Under the optimized conditions, the peak current is linear to FA concentration over the range of 2.0 x 10(-9) to 4.0 x 10(-6) M by using differential pulse voltammetry. and the detection limit is 1.0 x 10(-9) m (S/N = 3). The OMIMPF6-SWNT/GCE is successfully applied to the determination of FA in real samples. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：895 / 901
页数：7
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