Mohammed Djellouli

This study aimed to evaluate the antioxidant and antibacterial potential of Schinus molle essential oil in southwest Algeria. The antioxidant activity of the essential oil was assessed using the DPPH free radical scavenging method, while the antibacterial activity was determined using the disc diffusion method against Staphylococcus aureus and Escherichia coli strains, with chloramphenicol as the positive control. The results showed that the Schinus molle oil exhibited a high antioxidant potential, with 50% free radical inhibitory concentrations (IC50) of 0.41 mg/ml. Additionally, the oil demonstrated potent antibacterial properties against Gram-positive Staphylococcus aureus and weaker activity against Gram-negative Escherichia coli. These findings suggest that the essential oil of Schinus molle possesses promising biological potential, warranting further research into compounds derived from this species for the development of new antimicrobial drugs.

This study explored the chemical composition and antimicrobial properties of Eucalyptus globulus essential oil. The oil was extracted by hydrodistillation, yielding a 0.23% concentration. Gas chromatography (GC) analysis revealed three primary constituents: 1,8-cineole (commonly known as eucalyptol) at 81.55%, D-limonene at 5.409%, and alpha-pinene at 4.107%, collectively comprising 91.067% of the oil. Additionally, two minor constituents, making up 1.196% and 1.017% of the oil composition, were detected but remain unidentified. The antimicrobial potential of the oil was assessed against two bacterial strains, highlighting its bioactive properties. Results indicated that Eucalyptus globulus essential oil exhibited strong inhibitory effects against Staphylococcus aureus, a Gram-positive bacterium known to cause various infections. It also showed moderate activity against Escherichia coli, a Gram-negative bacterium commonly found in the intestines but also associated with foodborne illness. These findings underscore the potential of Eucalyptus globulus oil as a natural antimicrobial agent, particularly for targeting Gram-positive bacteria like Staphylococcus aureus. The presence of 1,8-cineole as the predominant component is likely responsible for the oil's notable antimicrobial efficacy, suggesting possible applications in medicinal and preservation contexts.