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Ultrasensitive detection of chlortetracycline in animal-origin food using molecularly imprinted electrochemical sensor based on SnS2/ZnCo-MOF and AuNPs
Food Chemistry ( IF 8.8 ) Pub Date : 2024-05-06 , DOI: 10.1016/j.foodchem.2024.139537
Ruonan Sun , Shuang Han , Wei Zong , Hongtao Chu , Xunan Zhang , Haiyan Jiang

The chlortetracycline (CTC) residue in food poses a threat to human health. Therefore, developing sensitive, convenient and selective analytical methods for CTC detection is crucial. This study innovatively uses tin disulfide/bimetallic organic framework (SnS/ZnCo-MOF) nanocomposites in conjunction with gold nanoparticles (AuNPs) to co-modify a glassy carbon electrode (GCE). Further, a molecularly imprinted polymer (MIP)-based electrochemical sensing platform Au-MIP/SnS/ZnCo-MOF/Au/GCE (AZG) was fabricated for selective CTC detection. SnS/ZnCo-MOF enhanced the stability and surface area of the AZG sensor. The presence of AuNPs facilitated electron transport between the probe and the electrode across the insulating MIP layer. The fixation of AuNPs and MIP via electropolymerization enhanced the selective recognition of this sensor and amplified its output signal. The AZG sensor demonstrated a wide linear detection range (0.1–100 μM), low detection limit (0.072 nM), and high sensitivity (0.830 μA μM). It has been used for detecting CTC in animal-origin food with good recovery (96.08%–104.60%).

中文翻译:

使用基于 SnS2/ZnCo-MOF 和 AuNP 的分子印迹电化学传感器超灵敏检测动物源性食品中的金霉素

食品中金霉素(CTC)残留对人体健康构成威胁。因此,开发灵敏、便捷、选择性强的CTC检测分析方法至关重要。这项研究创新性地使用二硫化锡/双金属有机骨架(SnS/ZnCo-MOF)纳米复合材料与金纳米粒子(AuNP)共同修饰玻碳电极(GCE)。此外,还制备了基于分子印迹聚合物(MIP)的电化学传感平台Au-MIP/SnS/ZnCo-MOF/Au/GCE(AZG)用于选择性CTC检测。 SnS/ZnCo-MOF 增强了 AZG 传感器的稳定性和表面积。 AuNP 的存在促进了探针和电极之间穿过绝缘 MIP 层的电子传输。通过电聚合固定 AuNP 和 MIP 增强了该传感器的选择性识别并放大了其输出信号。 AZG 传感器具有宽线性检测范围 (0.1–100 μM)、低检测限 (0.072 nM) 和高灵敏度 (0.830 μA μM)。它已用于检测动物源性食品中的CTC,回收率良好(96.08%–104.60%)。
更新日期:2024-05-06
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