制备印迹分子电化学传感器检测食品接触材料中DDM

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

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10~50μmol/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。

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.