Improved method for the determination of antimicrobial activity of essential oils in agar medium
1993
Remmal, A. | Bouchikhi, T. | Rhayour, K. | Ettayebi, M.
The influence of the number of bacterial cells inoculated and the emulsifying agent used to disperse essential oils (EO) into the culture media on the measurement of the antibacterial activity of EO in an agar medium was determined. The results showed that EO (oregano, thyme and clove) were most effective as antimicrobial agents when the bacterial load was low. Minimum inhibitory concentrations (MICs) were found to vary as a function of the emulsifying agent used. However, MICs obtained by dispersing EOs into 0.2% agar solution without the use of solvents and detergents were greatly reduced compared to when they were used. This demonstrates the fact that solvents and detergents often used in antimicrobial studies significantly decrease the antibacterial activity of EO.
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