Antimicrobial and anti-biofilm effects of Thyme essential oils and Peppermint on Acinetobacter baumannii and Staphylococcus aureus resistant to different antibiotics

The aim of this study was to investigate the antimicrobial and anti-biofilm effects of peppermint and Thyme on the antibiotic-resistant Acinetobacter baumannii and Staphylococcus aureus. Staphylococcus aureus and Acinetobacter baumannii strains were isolated from hospitals in Zabol city. The essential oil of Shirazi thyme and peppermint was obtained by Clevenger apparatus. Minimum lethal concentration and minimum inhibitory concentration were determined by microdilution method. Results showed that the lowest inhibitory concentration of peppermint essential oil against Acinetobacter baumannii and Staphylococcus aureus was 1.25 mg/ml. The results of our study on Thyme showed that the lowest concentration of Thyme essential oil against Acinetobacter baumannii and Staphylococcus aureus was 1.25 and 0.31 mg / ml, respectively. The results indicated that peppermint essential oil and Thymus vulgaris inhibited the growth of Staphylococcus aureus and Acinetobacter.