Title : Effect of Iodine doping ZnO on electrochemical ethylparaben (EthP) detection
Abstract:
Parabens, esters of p-hydroxybenzoic acid (including methylparaben (MeP), ethylparaben (EthP), propylparaben (PrP) and butylparaben (BuP)), are homologous molecules used in industry due to their antimicrobial activity. These molecules are also present naturally in many ecosystems. Parabens are well known to be an endocrine disruptors. Accordingly, it is of prime importance to control their concentration in the food industry, cleaning products, pharmaceutical products, and cosmetics products. The present study focuses on developing a new material electrode that serves as a parabens detector in the electrochemical process. In this context, Zinc Oxide “ZnO” was doped with iodine at various levels to improve its physicochemical properties. IxZnO (x=0.000, 0.025, 0.05, 0.075 and 0.1) nanoparticles were prepared by microwave-assisted method and characterized by XRD, XPS, SEM, and DRS. A deep electrochemical characterization including cyclic voltammetry, Tafel plots, Mott-Schottky measurements, and Electrochemical Impedance Spectroscopy (EIS) has been adopted. All these technics served the investigation of the feasibility of ethylparaben (EthP) detection. The oxidation of EthP was studded in the concentration range of 10 mM to 0.08 mM. A characteristic peak of anodic oxidation was observed at a potential of 0.767V vs. ECS. The best electrochemical EthP sensing process was obtained using I0.1ZnO electrode with a detection limit (DL) and a quantification limit (QL) of 0.0405 mM and 0.1351 mM, respectively. The proposed sensor showed a high-efficiency detection of EthP in cosmetics. The obtained results were corroborated with those obtained with HPLC.
