Electrochemical detection of dopamine in the presence of ascorbic acid using graphene modified electrodes

被引：626

作者：

Kim, Yang-Rae ^{[1
]}

Bong, Sungyool ^{[1
]}

Kang, Yeon-Joo ^{[1
]}

Yang, Yongtak ^{[1
]}

Mahajan, Rakesh Kumar ^{[2
]}

Kim, Jong Seung ^{[3
]}

Kim, Hasuck ^{[1
]}

机构：

[1] Seoul Natl Univ, Dept Chem, Seoul 151747, South Korea

[2] Guru Nanak Dev Univ, Dept Chem, Amritsar 143005, Punjab, India

[3] Korea Univ, Dept Chem, Seoul 136701, South Korea

来源：

BIOSENSORS & BIOELECTRONICS | 2010年 / 25卷 / 10期

关键词：

Dopamine; Ascorbic acid; Graphene; Cyclic voltammetry; Electrochemical impedance spectroscopy; NANOFIBERS MODIFIED ELECTRODE; URIC-ACID; GRAPHITE OXIDE; SHEETS; FILMS; ROUTE;

D O I：

10.1016/j.bios.2010.02.031

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Dopamine plays a significant role in the function of human metabolism. It is important to develop sensitive sensor for the determination of dopamine without the interference by ascorbic acid. This paper reports the synthesis of graphene using a modified Hummer's method and its application for the electrochemical detection of dopamine. Electrochemical measurements were performed at glassy carbon electrode modified with graphene via drop-casting method. Cyclic voltammogram of ferri/ferrocyanide redox couple at graphene modified electrode showed an increased current intensity compared with glassy carbon electrode and graphite modified electrode. The decrease of charge transfer resistance was also analyzed by electrochemical impedance spectroscopy. The capacity of graphene modified electrode for selective detection of dopamine was confirmed in a sufficient amount of ascorbic acid (1 mM). The observed linear range for the determination of dopamine concentration was from 4 mu M to 100 mu M. The detection limit was estimated to be 2.64 mu M. (C) 2010 Elsevier BM. All rights reserved.

引用

页码：2366 / 2369

页数：4

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