| خلاصه مقاله | Marrubium crassidens endemic to Armenia, Azarbaijan, Turkey and Iran is used in
folk medicine for a variety of ailments. The goal of our study was to assess the biological
activity of M. crassidens testing the methanol extract of aerial parts of the plant for its
antimicrobial activity against 5 known bacteria and a fungus. The air-dried aerial parts of
M. crassidens were successively extracted with petroleum ether (40–60°C),
dichloromethane and methanol via maceration at room temperature. The agar disc
diffusion method was employed to determine the microbial growth inhibitory properties
of the methanol extract against both Gram-positive and Gram-negative bacteria species;
Staphylococcus aureus, Staphylococcus epidermidis, Micrococcus luteus, Pseudomonas
aeruginosa, Escherichia coli, and a fungus; Candida albicans. Besides, minimal
inhibitory concentrations (MICs) were also determined by agar serial dilution method for
the strains of bacteria which had zone of microbial growth inhibition to evaluate the
inhibitory properties. The methanol extract of M. crassidens revealed moderated activity
when evaluated against pathogenic microorganisms of S. aureus and S. epidermidis
(Gram positive bacteria) with inhibition zone of 11.2 ± 0.4 and 10.5 ± 0.8 mm, and MIC
of 1 and 0.5 mg/μl, respectively. Overall, M. crassidens methanol extract showed
antibacterial activity against two gram positive microorganisms whereas differences in
microbial susceptibility were registered. |