Abstract
Fifty-three essential oils were tested against five micro-organisms (Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Candida albicans) using the agar overlay technique. The essential oils were randomly selected and not on the basis of a supposed activity. It was found that all oils showed an activity against at least one micro-organism, and that substantial activities against P. aeruginosa were scarce. Combined activities against C. albicans, the Gram-positive bacteria and E. coli, and an activity against C. albicans were most often observed. Secondly a combined activity against C. albicans, B. subtilis and S. aureus was found. The differences between the inhibition zones were too small for a differentiation of the antimicrobial activities of the essential oils. A correlation matrix shows the relationships of the micro-organisms as to the activity patterns of the essential oils. High correlations were found for all the micro-organisms, except for P. aeruginosa.
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