College of Chemical Engineering & Pharmaceutical, Henan University of Science and Technology, Luoyang, 471023, China.
Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, China.
Biosens Bioelectron. 2019 Oct 1;142:111491. doi: 10.1016/j.bios.2019.111491. Epub 2019 Jul 5.
A novel electrochemical sensor based on nitrogen and sulfur doped hollow MoC/C spheres (N, S-MoC) and molecularly imprinted polymer (MIP) was proposed for carbendazim (CBD) determination. The N, S-MoC were prepared by first nitrogen and sulfur doping via one-pot method and subsequent carbonization at high temperature. A film of MIP was then fabricated in situ on the N, S-MoC surface by electropolymerization, with CBD acting as template molecule and o-phenylenediamine as functional monomer. The N, S-MoC were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and electrochemical behaviors of CBD on differently modified electrodes were explored by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, a calibration curve of current shift versus the logarithm of CBD concentration was obtained in the range of 1×10 ∼ 8×10 M with a detection limit of 6.7×10 M (S/N=3). Moreover, the proposed sensor exhibited favorable stability and selectivity, and was applied to analyze pesticide residues in fruits and vegetables with decent accuracy.
一种基于氮硫掺杂中空 MoC/C 球(N、S-MoC)和分子印迹聚合物(MIP)的新型电化学传感器被提出用于检测多菌灵(CBD)。N、S-MoC 通过一锅法首先进行氮和硫掺杂,然后在高温下碳化制备。然后通过电聚合在 N、S-MoC 表面原位制备 MIP 薄膜,以 CBD 为模板分子,邻苯二胺为功能单体。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能谱(EDS)、X 射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)对 N、S-MoC 进行了表征,通过循环伏安法(CV)和电化学阻抗谱(EIS)研究了 CBD 在不同修饰电极上的电化学行为。在最佳条件下,在 1×10 ∼ 8×10 M 范围内得到了电流位移与 CBD 浓度对数的校准曲线,检测限为 6.7×10 M(S/N=3)。此外,该传感器表现出良好的稳定性和选择性,并应用于分析水果和蔬菜中的农药残留,具有良好的准确性。