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

Herein, an organometallic Au(III) catalyst was easily prepared via self-assembly method using chloroauric acid (HAuCl 4 ) 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.