一种检测莱克多巴胺的复合碳纳米材料修饰电化学传感器  

An electrochemical sensor for the detection of ractopamine based on carbon nanocomposite modified electrode

作　　者：谢晶磊[1] 曹小妹[2] 寻艳 陈丹[1] 何婧琳[1] 曹忠[1] 

机构地区：[1]长沙理工大学化学与生物工程学院电力与交通材料保护湖南省重点实验室,湖南长沙410004 [2]湖南师范大学化学化工学院,湖南长沙410081

出　　处：《化学传感器》2014年第2期40-45,共6页Chemical Sensors

基　　金：国家自然科学基金(21275022;21105005);湖南省科技计划项目(2013FJ3075);湖南省教育厅科研基金(12B002)资助

摘　　要：将双壁碳纳米管（DWCNT）和氧化石墨烯（GO）超声分散在Nafion的乙醇溶液中,滴涂于玻碳电极（GCE）表面制得氧化石墨烯/双壁碳纳米管-Nafion复合材料修饰电极（GO/DWCNT-Nafion/GCE）,可用于莱克多巴胺的灵敏检测。通过扫描电镜（SEM）对修饰电极表面形貌进行表征。使用差分脉冲伏安法（DPV）对莱克多巴胺在修饰电极上的电化学行为进行研究。实验结果表明,该修饰电极对莱克多巴胺表现出了强的电催化氧化效应。在pH=7.0的PBS缓冲体系中于-0.3 V下富集120 s后,该修饰电极对莱克多巴胺浓度在1.0×10^-8～1.0×10^-6mol/L范围内有着良好的线性响应,检测限为5.4×10^-9 mol/L。同时,该电极选择性良好,表明该方法在食品安全检测领域具有实际应用前景。Based on double-walled carbon nanotube（DWCNT） and graphene oxide（GO） which were ultrasonically dispersed into a Nafion solution, a GO/DWCNT-Nafion modified glassy carbon electrode was prepared for the detection of ractopamine. The surface morphologies of different modified electrodes were characterized by scanning electron microscopy（SEM）. The electrochemical behavior of ractopamine was investigated by differential pulse voltammetry（DPV）, indicating that the GO/DWCNT-Nafion modified electrode possessed an enhanced electrocatalytic activity to the oxidation of ractopamine. Under the condition of accumulating at- 0.3 V for 120 s in 0.01mol/L PBS（pH=7.0）, the modified electrode showed good response to ractopamine with a linear range from 1.0 × 10^-8to 1.0×10^-6mol/L and a detection limit of 5.4×10^-9mol/L. Moreover, the modified electrode showed nice selectivity for the detection of ractopamine, suggesting a potential application in food security field.

关 键 词：氧化石墨烯 双壁碳纳米管 莱克多巴胺 食品安全 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]