Application of nanosized gold and graphene modified carbon ionic liquid electrode for the sensitive electrochemical determination of folic acid

被引:31
|
作者
Wang, Xiaofeng [1 ]
You, Zheng [1 ]
Cheng, Yong [2 ]
Sha, Hailiang [3 ]
Li, Guangjiu [2 ]
Zhu, Huanhuan [2 ]
Sun, Wei [2 ]
机构
[1] Tsinghua Univ, Dept Precis Instrument, Beijing 100084, Peoples R China
[2] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China
[3] Beijing Stomatol Hosp, Dept Orthodont, Beijing 100050, Peoples R China
基金
中国国家自然科学基金;
关键词
Graphene; Gold nanopartide; Carbon ionic liquid electrode; Folic acid; Electrochemistry; VOLTAMMETRIC DETERMINATION; PASTE ELECTRODE; BEHAVIOR; SAMPLES; SENSOR; FILMS;
D O I
10.1016/j.molliq.2015.01.036
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study a new electrochemical folic acid (FA) sensor was proposed by using gold nanoparticles (AuNPs) and graphene (GR) modified carbon ionic liquid electrode (CILE) as the working electrode. GR and AuNPs were directly elettroreduced on the surface of CILE to get the modified electrode, which exhibited excellent electrochemical performances due to the specific characteristics including higher conductivity and larger surface area. The modified electrode showed excellent electrocatalytic ability to the oxidation of FA with an irreversible oxidation peak appeared at + 1.05 V (vs. SCE) in pH 5.5 phosphate buffer solution. Electrochemical behaviors of FA on the modified electrode were carefully investigated with the electrochemical parameters calculated. Under the optimal conditions and by using differential pulse voltammetry, the oxidation peak currents were linear to FA concentration in the range from 0.01 Knot L-1 to 50.0 mu mol L-1 with the detection limit as 2.7 mu mol L-1 (3 sigma). The proposed method was successfully applied to the FA tablet sample determination with satisfactory results. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:112 / 117
页数:6
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