Development of a new electrochemical method for evaluating the antioxidant capacity of the Pelargonium graveolens plant

Abstract

In this work, we present a study aimed at evaluating the antioxidant capacity of a plant of the type <em>Pelargonium graveolens < / em> , selected in Marrakech (Morocco). Four electrochemical methods were used: cyclic voltammetry (CV), linear voltammetry (LV), square wave voltammetry (SQW), and electrochemical impedance spectroscopy (EIS). The experiments were carried out using two types of electrodes: a carbon paste electrode (CPE) and an electrode modified with natural phosphate (CPE 50% / NP 50%). The measurements were performed in an electrochemical cell containing an electrolytic medium composed of Na₂SO₄ (0.1 mol / L) and hydrogen peroxide (H₂O₂). Different concentrations of the plant were successively added to this medium. The electrochemical methods used proved essential for evaluating the impact of <em> Pelargonium graveolens < / em>on the redox properties of the solution. The curves obtained show a notable decrease in peak current with increasing amounts of added plant material, revealing a pronounced antioxidant effect. These results demonstrate the potential of <em> Pelargonium graveolens< / em> as a natural source of antioxidants and highlight the importance of electrochemistry in the characterization of plant powders.