Amal Abdulaziz Al-Juraifani
Keywords: Antimicrobial activity, medicinal plants, plant extract.
Abstract: The antimicrobial activity of four plants’ extracts (Thyme leaves (Thymus vulgaris), Sage leaves (Salvia officinalis), Myrrh exudates (Boswelia carterii) and Oliban (Boswelia carterii)), used in traditional medicine in Saudi Arabia and other Middle East countries, were evaluated against the following seven bacterial species, Streptococcus sp., Staphylococcus aureus, Vibrio tubiashii, Micrococcus luteus ATCC 9341, Cellulosimicrobium cellulans, Bacillus cereus and Legionella pneumophila and two fungi species, Aspergillus flavus and Fusarium oxysporum f. sp. Lycopersicii. Our results showed that the highest antimicrobial activity was observed for the extracts of Thyme, Myrrah and Sage, and the Oliban extracts did not present any antimicrobial activity at any concentration. The minimum inhibitory concentration ranged from 2.0-4.0 % (v/v) for Thyme and Myrrh. The fungal species tested differed significantly in their susceptibility to plant extracts, with complete inhibition by Thyme to all tested microorganisms.
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