Organometallic Au(III) Based Electrochemical Sensor with Wide Anodic Potential Window for Sensitive and Selective Detection of Ochratoxin A

Abstract

AbstractHerein, an organometallic Au(III) catalyst was easily prepared via self‐assembly method using chloroauric acid (HAuCl4) and cetyltrimethylammonium bromide (CTAB). The electrode fabricated by the catalyst not only shows extended anodic potential window compared to that of Au nanoparticle‐based electrode, but also possess the high electrocatalytic activity in the selective oxidation of Ochratoxin A. Under optimized conditions, the modified electrode exhibits a wide linearity range from 1.0×10−7 to 1.0×10−5 mol/L and a low detection limit of 2.9×10−8 mol/L (S/N=3). Furthermore, the electrochemical sensor possesses good recoveries between 93.5 % and 98.2 % in real sample analysis, indicating high accuracy in real sample analysis.