噻虫胺分子印迹电化学传感器的制备与应用EI北大核心CSCD

以噻虫胺为模板分子,通过恒电位沉积壳聚糖,在还原氧化石墨烯(RGO)修饰的玻碳电极表面制备了可特异性识别噻虫胺的分子印迹传感器。采用交流阻抗法(EIS)、差分脉冲伏安法(DPV)和循环伏安法(CV)对传感器的电化学性能进行表征,优化了电沉积时间、洗脱圈数、孵化时间及溶液pH等实验条件。在优化条件下,以K_(3)Fe(CN)_(6)]作为电活性探针,DPV峰电流强度与噻虫胺浓度在1.0~1000 nmol/L范围内呈良好的线性关系,检出限0.46 nmol/L。将本方法应用于实际样品中噻虫胺的含量测定,加标回收率为97.6%~103.2%。

Preparation and application of clothianidin molecular imprinted electrochemical sensor

A molecular imprinting sensor specifically recognizing clothianidin was prepared on the surface of reduced graphene oxide (RGO) modified glassy carbon electrode using clothianidin as template molecule and chitosan deposited by potentiostatic method. The electrochemical properties of the sensor were characterized by AC impedance (EIS), differential pulse voltammetry (DPV) and cyclic voltammetry (CV). With K3 Fe(CN)6 ] as the electroactive probe under the optimized experimental conditions, the DPV peak current intensity showed a good linear relationship with clothianidin concentration in the range of 1. 0-1000 nmol / L, with the detection limit of 0. 46 nmol / L. The method was applied to the determination of clothianidin in actual samples with the recoveries of 97. 6%-103. 2%. © 2022, Youke Publishing Co.,Ltd. All rights reserved.