制备印迹分子电化学传感器检测食品接触材料中DDM

目的 将分子印迹技术与电化学相结合，实现食品接触材料中4,4''–二氨基二苯甲烷(DDM)的快速检测。方法 采用分子印迹技术，以羧基化碳纳米管(OH–MWCNT)为增敏材料，分别以DDM和吡咯(PPY)作为模板分子和功能单体，在玻璃碳电极(GCE)表面电沉积制备DDM印迹分子薄膜(MIP)，对印迹电极的检测能力使用扫描电镜(SEM)和电化学分析法进行表征。结果 电沉积的DDM电化学传感器具有优良的检测性能和可重复性，其线性范围为10~50 μmol/L，检出限为116 ng/L。结论 该方法具备操作简单、精度高、速度快等优点，能够实现对食品接触材料中DDM的痕量检测。

Preparation of Imprinted Molecular Electrochemical Sensor for Detection of 4,4'-Diaminodiphenylmethane in Food Contact Materials

The work aims to rapidly combine molecular imprinting technology with electrochemical analysis to achieve rapid detection of 4,4''-diaminodiphenylmethane (DDM) in food contact materials. The molecular imprinting technique was used to prepare imprinted molecular films of 4,4''-diaminodiphenylmethane (DDM) by electrodeposition on the surface of glassy carbon electrode (GCE) with carboxylated carbon nanotubes (OH-MWCNT) as the sensitizing material and 4,4''-diaminodiphenylmethane and pyrrole (PPY) as the template molecule and functional monomer, respectively. The detection capability of the imprinted electrode was characterizedwith electrochemical analysis and scanning electron microscopy (SEM). The electrochemical sensor for 4,4''-diaminodiphenylmethane was characterized by the electrodeposited electrode with excellent detection performance and reproducibility in the linear range of 10-50 umol/L and a detection limit of 116 ng/L. The method is simple, accurate and fast, and can be used for the determination of trace amounts of 4,4''-diaminodiphenylmethane in food contact materials.