hicham harhar

The Argan tree or Argania spinosa</em> L. is a plant in the Sapotaceae family. It is an endemic tree from Morocco. This study aims to evaluate the phytochemical and antiradical potential of different parts of Argan for the further valorization of this organic material. Seeds, kernels, pulps, leaves, and branches were targeted for this purpose and were soxhlet extracted with methanol. Amongst the different parts, leaves displayed the greatest DPPH radical scavenging ability with an IC50</sub> value (4.37 µg mL-1</sup>) close to that of ascorbic acid (1.97 µg mL-1</sup>). This observation was true for the ABTS assay as well. Accordingly, leaf extract was also the highest in polyphenols content (TPC) content, while seeds recorded the lowest value. The results were not so different for the flavonoid content, where leaf extract recorded the highest content. The leaves and branch of Agran seem to be the richest in antioxidant agents, as shown by the gathered data and results. Hence, it could be used as an important source of natural antioxidants.

The present work continues to focus on expanding the use of plant extracts to combat metal corrosion and reports on the inhibiting effect of Hammada Scoparia (HS) extract on the corrosion of carbon steel in 1 M hydrochloric acid. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and gravimetric methods were utilized to examine the metal corrosion behavior without and with inhibitor. Polarization studies show that the Hammada Scoparia (HS) extract acts as a mixed inhibitor in acidic electrolyte and its inhibitory effectiveness rise with Hammada Scoparia (HS) extract concentration reaches a maximum of
93% for 0.6 g/L. The obtained Nyquist plots showed depressed semicircles and their diameter enhanced with rising HS extract concentration. The inhibiting capacity of HS extract for carbon steel in hydrochloric acid at diverse temperatures (303-333 K) was reduced somewhat. The adsorption of the HS extract on carbon steel follows the Langmuir isotherm. SEM and EDX observations confirmed the existence of protective film on the metal surface. A good agreement was obtained between various used technical.

In this work, we are interested in studying the effect of the addition Lepidium sativum seeds (LSS) on the inhibition of the corrosion of carbon steel in acidic medium 1.0 M HCl. The inhibition of the corrosion reaction of carbon steel (CS) was performed using (LSS) in a 1.0 M hydrochloric acid medium using impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). The phytochemical study revealed the existence of flavonoids, saponosides, tannins, alkaloids, sterols and polyterpenoids compounds. Inhibitory efficiency increases with increasing inhibitor concentration and decreases with increasing temperature. The experimental results show that Lepidium sativum seeds (LSS) is a good corrosion inhibitor where the maximum inhibition is around 90% at 2 g/L. PDP studies show that the Lepidium sativum seeds (LSS) act as mixed inhibitor. Corrosion current density decreased from 729 µAcm-2 (blank) to 125 µAcm-2 at 2 g/L (LSS). The studied inhibitor is adsorbed on the metal surface according to the model of the Langmuir adsorption isotherm