Test compounds were prepared in methanol(5g/L). Corresponding concentrations of methanol were used as controls and did not affect the growth. Serial dilutions of test compounds (5 µL) were added in the duplicate sets of 16×150 mm test tubes that contained 1 mL BHI broth, and inoculated with 5 µL of 20 h old cultures diluted in saline to a final concentration of app. 100 cfu/mL. The test tubes were incubated at 37 ˚C for S.typhimurium, S. aureus, and E. coli, while B. cereus cultures were incubated at 28 to 30 ˚C , without shaking, for 24 to 48 h, and then examined visually for turbidity. The experiments were repeated three times.