Electrochemical Evaluation of Vitamin B2 through a Portable Electrochemical Sensor Based on Binary Transition Metal Oxide in Various Biological and Vegetable Samples
Abstract
We report on the fabrication and electrochemical evaluation of a Vitamin B2-riboflavin (RF) sensor based on binary transition metal oxide (ZnO-MnO) core-shell nanocomposites (CSNs) on the surface of the glassy carbon electrode (GCE). The nanocomposites are attained through a one-step hydrothermal synthesis route using zinc acetate and manganese acetate as precursors where ZnO acts as a core and MnO forms as a shell. As-synthesized binary transition metal oxide-based composite was scrutinized through various physicochemical techniques, demonstrating excellent physiochemical features. ZnO-MnO/GCE composite delivers synergistic features of improving the electrochemical properties toward detection of RF at an operational voltage of 0.42 V, with increased active sites because of its structural morphology and high surface area. ZnO-MnO/GCE is examined through electrochemical impedance spectroscopy, cyclic voltammetry, differential pulse voltammetry, and linear sweep voltammetry. Furthermore, ZnO-MnO/GCE shows a remarkable kinetic transfer rate and superior electron transfer rate over other modified electrodes. It also exemplifies a wider linear range (0.05 – 1102 µM), with Nanomolar level detection of 13 nM aided with a sensitivity of 0.3746 µA µM-1 cm-2, respectively. The proposed ZnO-MnO/GCE sensor demonstrates excellent selectivity over the presence of co-interfering species exquisite repeatability, reproducibility, and stability.
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