Solvation and Thermodynamic Properties of Hibiscus Sabdariffa Extract with Magnesium ions in Different Solutions via 18-Karat Gold Electrode. | ||
| Egyptian Journal of Chemistry | ||
| Articles in Press, Accepted Manuscript, Available Online from 02 November 2025 | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejchem.2025.401609.12013 | ||
| Authors | ||
| Essam A. Gomaa* 1; Abrar K Elshewemy2; Hamed abu elnader3; Mahmoud N. Abdel-Hady4; Marwa G. El-Ghalban5 | ||
| 1Chemistry Department, Faculty of Science, El-Mansoura University Egypt | ||
| 2chemistry department, faculty of science, Mansoura university. | ||
| 3chemistry department, faculty of science, Mansoura university.egypt | ||
| 4Chemistry department, Faculty of Science, El-Mansoura University, Egypt. | ||
| 5Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt. | ||
| Abstract | ||
| Hibiscus sabdariffa, commonly known as Karkade in Egypt, is a medicinal plant rich in anthocyanins and natural antioxidants. This study investigates the electrochemical behavior of magnesium sulfate (MgSO4) in the presence of Egyptian Hibiscus Sabdariffa flower extract using cyclic voltammetry. The experiments were proceeded with a 18-karat gold working electrode at a scan rate of 0.1 V/s in hydrochloric acid (HCl) and potassium bromide (KBr) solutions. The concentrations of Hibiscus sabdariffa extract ranged from 0.2 to 2.0 mL (≈ 0.62 × 10-3 to 5.88 × 10-3 mol L⁻¹). In HCl medium, the voltammogram displayed one reduction peak at -0.10 V and an oxidation peak at +0.20 V, indicating quasi-reversibility redox behavior of Mg(II) ions. The addition of the extract caused a ~40 % decrease in cathodic current intensity, indicating complex formation between Mg²⁺ and antioxidant constituents of the extract. Gibbs free-energy values (ΔG° = −9.66 to −0.32 kJ mol-1) indicated spontaneous interaction. These findings show that Hibiscus sabdariffa significantly affects Mg²⁺ electrochemistry through solvation and complexation, suggesting green applications in environmental, food, and pharmaceutical analysis. | ||
| Keywords | ||
| Cyclic voltammetry; Hibiscus sabdariffa; thermodynamics; magnesium sulfate; 18 karrat Gold electrode | ||
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