Stock solutions of the essential oil and antibiotic standards (ampicillin and ciprofloxacin) were prepared in 5.0% (v/v) DMSO. Dilution series,using MHB, were prepared from 0.032 to 0.500 mg/ml. After incubation at 37◦C for 24 h, the micro organism growth inhibition was evaluated by measuring absorbance at 630 nm, using a spectrophotometer.