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Construction of a Highly Selective and Sensitive Dopamine Enzyme-free Biosensor Based on Carbon Nanomaterials

文献类型： 外文期刊

作者： Liu, Chong 1 ; Xie, Yuchen 1 ; Hou, Yingjiao 1 ; Wang, Ziyi 1 ; Pan, Xiaoyu 2 ; Zhu, Hong 1 ; Li, Hongna 3 ;

作者机构： 1.Beijing Agr Univ, Coll Biosci & Resource Environm, Minist Agr & Rural Affairs Peoples Republ China, Key Lab Urban Agr North China, Beijing 102206, Peoples R China

2.Beijing Agr Univ, Beijing Key Lab Detect & Control Spoilage Microor, Beijing 102206, Peoples R China

3.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Agr Clean Watershed Res Grp, Beijing 100081, Peoples R China

关键词： Carbon nanomaterials; Dopamine; Gold nanoparticles; Enzyme-free biosensor

期刊名称：ELECTROANALYSIS （ 影响因子：3.223； 五年影响因子：2.947 ）

ISSN： 1040-0397

年卷期：

页码：

收录情况： SCI

摘要： A selective and sensitive electrochemical enzyme-free sensor for dopamine (DA) was prepared, containing carbon nanomaterials, gold nanoparticles (GNPs) and room-temperature ionic liquid of 1-butyl-3-methylimidazolium tetrafluor (BmimBF(4)). The peaks of DA, ascorbic acid (AA) and uric acid (UA) can be well separated by optimization of pH condition and carbon nanomaterials.Multi-walled carbon nanotubes (MWCNTs), single-walled carbon nanotubes (SWCNTs), single-walled carbon nanohorns (SWCNHs), carboxylated graphene (C-GR), were chosen to compare the affection to DA detection. The catalytic effect was SWCNTs>MWCNTs>C-GR approximate to SWCNHs. It showed carbon nanotube materials with electron acceleration channels play the key role in catalytic performance. The pH condition also influenced detection, all the redox peak potentials of DA, UA, and AA had a negative shift as the pH changed from low to high, but the amplitude of the shift was different. At pH 1, the three anodic peaks are separated ca.0.24 V and 0.20 V. Under optimum conditions linear calibration graphs were obtained over the DA concentration range 0.2 to 20 mu M.The modified electrode was applied for the assay of spiked DA in blood serum and human urine.This work studied the influence of carbon nanomaterials on DA detection and provided a simple approach to selectively detect dopamine in the presence of AA and UA.

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