Abstract

The present research devised a strongly sensitive user-friendly electrochemical sensor to determine Sudan I with regard to ZnFe2O4 nanoparticles (NPs) modified graphite screen-printed electrode (GSPE), ZnFe2O4/SPE, with various cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. Our sensor exhibited clear catalytic behaviours towards Sudan I oxidation validated by the reduced oxidation peak potentials and enhanced the peak currents of oxidation as compared to the bare SPE. Therefore, Sudan I electron transfer coefficient (alpha) as well as the diffusion coefficient (D) have been derived at the modified electrode. Analyses showed 0.1-500.0 mu M linear response range and 0.03 mu M limit of detection (LOD). While determining Sudan I, other species exhibited no intervention in the new sensor surface at optimum condition. Finally, Sudan I has been successfully determined by this sensor in the real samples with reasonable outputs.