一种用于检测赭曲霉毒素 A 的新型电化学免疫传感器的构建及表征分析

摘要

目的：建立一种新型电化学免疫传感器用于赭曲霉毒素A（OTA）的快速检测。方法以固载于玻碳电极（GCE）表面的单壁碳纳米管／壳聚糖（SWNTs／CS）复合物膜为基底构建OTA双层自组装免疫传感器，采用电镜扫描分析、方波伏安和循环伏安法对传感器进行表征分析，并研究其用于检测的特异性。结果壳聚糖／单壁碳纳米管复合膜能够显著增加电化学免疫传感器检测OTA的灵敏度，能够有效地分辨不同种类的真菌毒素。结论本研究构建的电化学免疫传感器检测OTA具有快速、简便、检出限低，特异性强等特点。%Objective To develop a new type of electrochemical immunosensor for the detection of ochratoxin A (OTA ) . Methods Double layers of self‐assembly immunosensor for the detection of OTA were constructed based on the composite single‐walled carbon nanotubes(SWNTs)/chitosan(CS) membrane immobilized on glassy carbon electrode(GC) .Scanning electron mi‐croscopy(SEM) ,square wave voltammetry and cyclic voltammetry were used to analyze the characterization of the sensor ,then its specificity for detection was studied .Results SWNTs/CS composit membrane could increase the sensitivity of OTA detection sig‐nificantly ,and effectively distinguish the different types of mycotoxins .Conclusion The electrochemical immunosensor developed in the study is easy to operate and could detect OTA rapidly with good specificity and low detection limit .