A selective molecularly imprinted electrochemical sensor with GO@COF signal amplification for the simultaneous determination of sulfadiazine and acetaminophen

电化学气体传感器 检出限 分子印迹聚合物 色谱法 校准曲线 核化学 化学 电化学 选择性 电极 有机化学 物理化学 催化作用
作者
Yufeng Sun,Jingbo He,Geoffrey I. N. Waterhouse,Longhua Xu,Hongyan Zhang,Xuguang Qiao,Zhixiang Xu
出处
期刊:Sensors and Actuators B-chemical [Elsevier BV]
卷期号:300: 126993-126993 被引量:110
标识
DOI:10.1016/j.snb.2019.126993
摘要

In this work, the development of a simple and sensitive electrochemical sensor for the simultaneous determination of sulfadiazine (SDZ) and acetaminophen (AP) is described. The sensor harnessed a molecularly imprinted polymer (MIP) for selective recognition of SDZ and AP, and a graphene [email protected] organic framework ([email protected]) nanocomposite for signal amplification. The [email protected] nanocomposite was first immobilized on a glassy carbon electrode (GCE), after which a polypyrrole MIP was electrodeposited on the modified electrode. The resulting electrochemical sensor (denoted as MIP/[email protected]/GCE) showed a strong current response to both SDZ and AP in phosphate buffer at pH 7.0. Under optimal testing conditions, linear calibration curves were obtained over the concentration range 0.5–200 μM for SDZ and 0.05–20 μM for AP, with limits of detection being 0.16 μM and 0.032 μM, respectively. Beef and fodder samples spiked with SDZ and AP were extracted in ethyl acetate, then the SDZ and AP in the extracts quantified using the MIP/[email protected]/GCE sensor. Recoveries were excellent, ranging from 82.0 to 108.0%. The same method was also employed to determine SDZ and AP residues in pork and chicken samples, with the results correlating well with those obtained using high-performance liquid chromatography.
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