检出限
循环伏安法
介孔材料
材料科学
选择性
环糊精
伏安法
电极
分析化学(期刊)
比表面积
化学工程
电化学
化学
核化学
色谱法
催化作用
有机化学
物理化学
工程类
作者
Yong Sun,Tingting Wei,Mingdi Jiang,Longhua Xu,Xu Zhou
标识
DOI:10.1016/j.snb.2017.09.016
摘要
A simple and sensitive three-dimensional voltammetric sensor was constructed for the determination of chloramphenicol (CAP). First, ordered mesoporous carbon was introduced onto a glassy carbon electrode to improve the electron transport performance, and then a polydopamine layer was formed on the surface to enhance the hydrophilicity and provide a negative charge to attract positively charged CAP. Finally, the electrode surface was modified through electrochemical polymerization with β-cyclodextrin, which contains abundant hydroxygroups to provide more hydrogen-bonding sites for CAP binding. The developed sensor was investigated with square wave voltammetry and cyclic voltammetry, and exhibited a rapid current response and high selectivity for CAP. Under optimal conditions, the method offered a wide current response for CAP from 5.0 × 10−7 to 5.0 × 10−4 mol L−1 and the limit of detection was 2.0 × 10−7 mol L−1. Milk powder and bee pollen samples spiked with CAP were extracted and then determined using the β-CD/[email protected]/GCE sensor with satisfactory recoveries of 80.0%-101.6%. The method was also used to determine CAP residues in real milk and honey samples, and the results correlated well with those obtained using high-performance liquid chromatography.
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