Argan leaves aqueous extract’s antioxidant activity and mild steel corrosion inhibition ability

• H. Laaroussi¹, A. Aouniti¹, B. Hafez², O. Mokhtari³, R.A. Sheikh⁴, I. Hamdani¹, I. Rahhou⁵, El H. Loukili¹, C. Belbachir⁶, B. Hammouti¹ and H. Elmsellem¹

¹ Laboratory of Applied Chemistry and Environment (LCAE) sciences faculty, Oujda, Morocco
² Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, Ajman University, PO Box: 346 Ajman, UAE
³ Laboratory of the Improvement of Agricultural Production, Biotechnology and Environment, sciences faculty, Oujda, Morocco
⁴ Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
⁵ Higher Institute of Nursing Professions and Health techniques (ISPITSO) Oujda, Morocco
⁶ Laboratoire Régional de Recherches et d’analyses de Berkane – ONSSA, Qualipole Alimentaire, Agropole de Berkane, Berkane, Morocco

Abstract: The aim of this study is the valorization of Argan leaves’ Aqueous Extract (ALAE) as a potential industrial alternative for Argania spinosa kernels’ extracts. The chemical composition of ALAE was investigated by HPLC/UV-VIS/DAD and we successively identified 5 compounds in which quercetin and its derivatives represent 85.47%. We also evaluated the antioxidant activity via two assays DPPH* scavenging activity and Ferric Reducing Antioxidant Power (FRAP). The concentration required to achieve 50% of antioxidant activity is 142.53±1.26 μg/mL and 129.68±3.42 μg/mL, respectively, which was compared to standard antioxidants such as gallic acid (17.41±2.15 μg/mL, 17.01±1.35 μg/mL) and ascorbic acid (56.26±1.09 μg/mL, 37.93±0.65 μg/mL). The assessment of the corrosion inhibition of mild steel was carried out using three techniques: weight loss measurements, electrochemical impedance spectroscopy and polarization curves. Acting as a mixed type corrosion inhibitor and obeying to Langmuir adsorption isotherm, the ALAE inhibition efficiencies obtained by the three techniques are 79%, 82%, and 82%, respectively.

Keywords: Argania spinosa, chemical composition, corrosion inhibitor, EIS, antioxidant activity

Int. J. Corros. Scale Inhib., 2022, 11, no. 4, 1539-1556
doi: 10.17675/2305-6894-2022-11-4-7

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