Determination of Sudan I and Bisphenol A in Tap Water and Food Samples Using Electrochemical Nanosensor

For the first time, a highly sensitive and selective electrochemical sensor was fabricated based on a MoWS2 nanoparticles modified screen printed electrode (MoWS2/SPE) for the simultaneous determination of Sudan I and bisphenol A. The MoWS2 nanoparticles synthesized by a hydrothermal method were characterized using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The MoWS2/SPE exhibited excellent electrocatalytic activity towards the oxidations of Sudan I and bisphenol A in a phosphate buffer solution at pH 7.0, and the corresponding electrochemical signals have appeared as two well resolved oxidation peaks with significant peak potential differences of 120 mV. For selective determination, the linear response of Sudan I was in a concentration range of 0.05 to 700.0 μM with a detection limit of 0.01 μM. The proposed sensor has proved to be applicable for the determination of the target analytes in tap water and food samples.