Abstract

The given study aimed to modify carbon paste electrode by NiFe2O4/rGO nanocomposite and ionic liquid as an efficient electrochemical sensor for the co-detection of vanillin and folic acid. The NiFe2O4/rGO nanocomposite was prepared by simple technique. The characterization of NiFe2O4/rGO nanocomposite was performed using X-ray diffraction, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy, and Raman analysis. The electrochemical functions of NiFe2O4/rGO/ILCPE were analyzed by cyclic voltammetry, differential pulse voltammetry, chronoamperometry, as well as linear sweep voltammetry. The results exhibited an admirable sensitivity for the modified NiFe2O4/rGO/ILCPE toward vanillin. Moreover, an excellent resolving capacity was displayed for the modified sensor to overlap the voltammetric behavior of vanillin and folic acid into two distinct resolved peaks. Additionally, the co-detection of folic acid and vanillin was successful on the modified CPE with no interference. The limit of detection as 6.0 nM with the linear dynamic range of 0.02-285.0 mu M for the vanillin determination. The applicability of developed sensor was also successfully confirmed by analyzing vanillin and folic acid present in food specimens.