MoS2 nanosheets-modified screen-printed electrode for the simultaneous detection of carmoisine and tartrazine
H Abboud, Zaid H. Mahmoud, Aya Mohammed Saadoun, Ekhlas A. Abdulkareem, Mustafa Mudhafar, Qais R. Lahhob, Raed Muslim Mhaibes
Abstract
Molybdenum disulfide nanosheets (MoS2 NSs) were prepared using a solvothermal synthesis approach. The synthesized MoS2 nanosheets were used to modify a screen-printed electrode (MoS2 NSs / SPE), which was then utilized as the working electrode for the voltammetric analysis of carmoisine. The MoS2 NSs / SPE demonstrated enhanced electrocatalytic activity towards the oxidation of carmoisine. The oxidation peak currents of carmoisine were found to be linearly proportional to its concentration over a range of 0.1 to 400.0 μM, with a detection limit as low as 0.03 μM under optimized conditions. The MoS2 NSs / SPE also demonstrated effective performance in detecting carmoisine even when tartrazine was present, indicating its potential for simultaneous determination of both compounds. The oxidation peak potentials of the two azo dyes were sufficiently separated by 200 mV, making the MoS2 NSs / SPE suitable for the simultaneous detection of carmoisine and tartrazine using differential pulse voltammetry.