Antibacterial effect of myrtus communis hydro-alcoholic extract on pathogenic bacteria

Today, due to the changes in the form of the resistance of pathogenic bacteria, discovering new antimicrobial drugs is under study. So, the aim of this study is to evaluate the antimicrobial properties of the extract of the myrtle herb on some of pathogenic bacteria. Hydroalcoholic extract of the leaves of myrtle herb was evaluated at 4 concentrations including 10-80 mg/ml on four strains of pathogenic bacteria using penetrative dissemination method together with the measuring diameter of the growth inhibition zone; then the results were compared to four conventional antibiotics. The minimum inhibitory and bactericidal concentrations were studied using macro dilution method. Treatment by the concentration of 80 mg/ml extract of this herb showed the greatest effect on the bacterium Staphylococcus aureus and Vibrio cholera serotype Ogawa which had a significant difference with all other treatments and standard antibiotics [p< 0.05]. The extract showed no effect on the bacterium Pseudomonas aeruginosa and just concentration of 80 mg/ml showed a little effect on E. coli and other antibiotics had no significant effect except tetracycline which has little effect on this strain. Minimum inhibitory concentration was 0.2 mg/ml for bacterium Staphylococcus aureus [S. aureus] and the maximum for E.coli by 8 mg/ml. This study showed that under study bacteria were more resistant to the antibiotics and the extract of Myrtus communis leaves showed greatest antibacterial effect against S. aureus and V. cholerae cerotype Ogawa

[Study of antibacterial effect of Prosopis sp. hydro-alcoholic extract]

Increasing incidence of drug resistant microorganisms poses enormous threat to the human health and requires alternative sources of antimicrobial agents. Plants develop unique family of chemicals to protect themselves from various microbes. The aim of this study was to investigate antibacterial effect of Prosopis sp. hydro-alcoholic extract on some pathogenic bacteria. This study was conducted at Chabahar Maritime University. Leaf of Prosopis sp. was collected and the essence was extracted by hydro-alcoholic extraction method. The extract dried and 4 different concentrations of 10, 20, 40 and 80 mg/ml were prepared after autoclave. Extracts were examined on 4 different clinical bacteria by the Disc Diffusion Agar Method at 3 replicates. Minimum inhibitory concentration [MIC] and minimum lethal concentration [MLC] were determined by the serial dilution method. ANOVA and Duncan Multiple Range test was used to analysis data. Hydro-alcoholic extract showed antibacterial effect after autoclave. Concentrations of 40 and 80 mg/ml showed the best result on Staphylococcus aureus and had significant difference with other treatments and standard antibiotics [p<0.05]. Extracts didn't show any effect on Pseudomonas aeruginosa. Regarding Escherichia coli, concentration of 80 mg/ml had significant difference with other treatments and standard antibiotics [p<0.05]. Minimum MIC was 2 mg/ml for Staphylococcus aureus and Vibrio cholerae serotype ogava. MLC was in higher concentrations. This study showed that autoclave prepared new compounds which had antibacterial effect. Hospital acquired bacteria were resistance to common antibiotics. The Prosopis sp. extract had higher antibacterial effect on Staphylococcus aureus and Vibrio cholerae serotype ogava in comparison with antibiotics.