Evaluation of the Usefulness of an Electrochemical Sensor in Detecting Ascorbic Acid using a Graphite Screen-printed Electrode Modified with NiFe2O4 Nanoparticles

In this study, a new modified electrode was proposed to measure ascorbic acid. Graphite screen printed electrode was modified with NiFe2O4 nanoparticles (NiFe2O4/SPE). Cyclic voltammetry (CV), Chronoamperometry (CHA) and differential pulse voltammetry (DPV) methods were used to analyze the prepared electrode. The catalytic property resulting from the synergistic effect of this modifier not only increased the oxidation current but also reduced the oxidation potential of ascorbic acid. Scan rate and pH effects on the performance of NiFe2O4/SPE were also investigated. The linear calibration curve of ascorbic acid was obtained within the linear range of 5.0×10−7–1.0×10−4 M, and the detection limit was calculated as 1.0×10−7 M. Finally, the modified electrode was successfully used to measure ascorbic acid in some real samples.