A novel molecularly imprinted electrochemical sensor based on quasi-three-dimensional nanomaterials Nb2CTx/AgNWs for specific detection of sulfadiazine

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2024-10-31 DOI:10.1007/s00604-024-06805-3

Yifei Wang, Jingwen He, Jie Wu, Wen Hao, Lin Cai, Haiyang Wang, Guozhen Fang, Shuo Wang

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Abstract

A novel molecularly imprinted electrochemical sensor (MIECS) was constructed for the specific detection of sulfadiazine (SDZ) in food. Niobium carbide (Nb₂CTx) as a typical two-dimensional lamellar nanomaterial has good electrical conductivity and unique structure, which was assembled with one-dimensional silver nanowires (AgNWs) to form quasi-three-dimensional composite nanomaterials (Nb₂CTx/AgNWs). As spacer material, AgNWs prevented the aggregation of Nb₂CTx and the collapse of Nb₂CTx layers. At the same time, a fast electron transport channel was constructed through the synergistic effect between nanomaterials the two. The Nb₂CTx/AgNWs realized the enhancement of electrical signals. Molecularly imprinted polymers (MIPs) endowed the sensor with selectivity, achieving the specific detection of sulfadiazine. Under the optimal experimental conditions, the method has a wide linear range (1 × 10⁻⁸–1 × 10⁻⁴ mol L⁻¹) and a low limit of detection (1.30 × 10⁻⁹ mol L⁻¹). The sensor was used to detect sulfadiazine in pork, chicken, and feed samples, and the recovery was 82.61–94.87%. The results were in good agreement with the HPLC results, which proved the accuracy and practicability of the method.

Graphical abstract

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基于准三维纳米材料 Nb2CTx/AgNWs 的新型分子印迹电化学传感器用于磺胺嘧啶的特异性检测

本研究构建了一种新型分子印迹电化学传感器（MIECS），用于特异性检测食品中的磺胺嘧啶（SDZ）。碳化铌（Nb2CTx）作为一种典型的二维片状纳米材料，具有良好的导电性和独特的结构，它与一维银纳米线（AgNWs）组装成准三维复合纳米材料（Nb2CTx/AgNWs）。作为间隔材料，AgNWs 可防止 Nb2CTx 的聚集和 Nb2CTx 层的坍塌。同时，通过这两种纳米材料之间的协同效应，构建了一个快速电子传输通道。Nb2CTx/AgNWs 实现了电信号的增强。分子印迹聚合物（MIPs）赋予了传感器选择性，实现了对磺胺嘧啶的特异性检测。在最佳实验条件下，该方法具有较宽的线性范围（1 × 10-8-1 × 10-4 mol L-1）和较低的检测限（1.30 × 10-9 mol L-1）。利用该传感器检测了猪肉、鸡肉和饲料样品中的磺胺嘧啶，回收率为 82.61%-94.87%。结果与高效液相色谱法的结果一致，证明了该方法的准确性和实用性。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.