个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职:化学学院副院长
其他任职:辽宁省教学名师,宝钢优秀教师特等奖提名奖,中国分析测试学会青年学术委员会委员
性别:女
毕业院校:南京大学
学位:博士
所在单位:化学学院
学科:分析化学. 生物化学与分子生物学
办公地点:化工综合楼C305
电子邮箱:wushuo@dlut.edu.cn
Electrochemically reduced graphene oxide and Nafion nanocomposite for ultralow potential detection of organophosphate pesticide
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论文类型:期刊论文
发表时间:2013-02-01
发表刊物:SENSORS AND ACTUATORS B-CHEMICAL
收录刊物:SCIE、EI
卷号:177
页面范围:724-729
ISSN号:0925-4005
关键字:Graphene and Nafion nanocomposite; Electrochemical reduction; Organophosphate pesticide; Low-potential
摘要:The development of rapid and field monitoring tools is highly desirable for the sensitive detection of organophosphate pesticide (OP) residues in water and agriculture products without interference. A novel disposable acetylcholinesterase (AChE) biosensor with low detecting potential (+50 mV), good selectivity, and high sensitivity was developed based on electrochemically reduced graphene oxide and Nafion hybrid nanocomposite (Er-GRO-Nafion) modified electrode. The Er-GRO-Nafion nanocomposite with conductive and three-dimensional interpenetrating network owns excellent characters as electrode modification material. It effectively promoted the electron transfer rate of electrode interface, could catalyze the anodic oxidation of thiocholine at ultra-low potential, and facilitated the access of substrates to the active centers. The modified electrode was used for the electrochemical detection of dichlorvos after adsorbing AChE on the biocompatible matrix. By dexterously controlling the electrochemical reduction variables and optimizing the electrode preparation parameters, the proposed electrochemical biosensor showed high sensitivity, wide linear range (from 5.0 to 100 ng mL(-1) and from 1.0 to 20 mu g mL(-1)), low detection limit (2.0 ng mL(-1)), good stability and reproducibility. It also had high precision for the real sample analysis, which indicated the good perspective for field application. (c) 2012 Elsevier B.V. All rights reserved.
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