The objective of this study was to evaluate the in vitro antimicrobial efficacy of thyme essential oil (Thymus vulgaris) on Staphylococcus aureus. Concentrations at 1, 5, 10, 30, 50, 70 and 90% were evaluated in 96.8% dilution in ethanol. The Minimum Inhibitory Concentration was determined by the broth microdilution method. The bacterial inoculum was standardized to 0.5 of the MacFarland scale in spectrophotometer, with the result that the 1% tube of thyme oil did not present turbidity. This, when cultured on Mueller-Hinton agar, determined the Minimum Bactericidal Concentration where no colony growth was observed. The results indicate that treatments at 5 and 10% were not significantly different (p<0.05) with values of inhibition halos of 15.35 mm and 15.9 mm, respetively compared to 1% concentration that presented 12.2 mm of halo of inhibition.

El trabajo de investigación tuvo como objetivo evaluar la eficacia antimicrobiana in vitro del aceite esencial de tomillo (Thymus vulgaris) sobre Staphylococcus aureus. Se evaluaron concentraciones al 1, 5, 10, 30, 50, 70 y 90% en dilución en etanol al 96.8%. Se determinó la Concentración Mínima Inhibitoria mediante el método de microdilución en caldo. El inóculo bacteriano se estandarizó al 0.5 de la escala de MacFarland en espectofotómetro, teniendo como resultado que el tubo al 1% de aceite de tomillo no presentó turbidez. Este, al ser sembrado en agar Mueller-Hinton determinó la Concentración Bactericida Mínima donde no se observó crecimiento de colonias. Los resultados indican que los tratamientos al 5 y 10% no son significativamente diferentes (p<0.05) con valores de halos de inhibición de 15.35 mm y 15.9 mm, respectivamente, en comparación al 1% que presentó 1...

The objective of this study was to evaluate the in vitro antimicrobial effect of eucalyptus essential oil (Eucaliptus spp) on Escherichia coli ATCC® 11229 and Staphylococcus aureus subsp. aureus ATCC® 25904. Concentrations of 30, 60 and 90% were evaluated in dilution in 96.8% ethanol. The Minimum Inhibitory Concentration (MIC) was determined by the broth microdilution method. The bacterial inoculum was standardized to 0.5 of the MacFarland scale in spectrophotometer, obtaining as a result that the concentrations of 60 and 90% did not present turbidity. The Minimum Bactericidal Concentration (MBC) determined in Mueller-Hinton agar was present from the 60% concentration for the two strains under study. The antimicrobial susceptibility test indicated that all concentrations showed antimicrobial sensitivity and that the concentrations at 30 and 60% were not significantly different, present...

The objective of this study was to evaluate the in vitro antimicrobial effect of eucalyptus essential oil (Eucaliptus spp) on Escherichia coli ATCC® 11229 and Staphylococcus aureus subsp. aureus ATCC® 25904. Concentrations of 30, 60 and 90% were evaluated in dilution in 96.8% ethanol. The Minimum Inhibitory Concentration (MIC) was determined by the broth microdilution method. The bacterial inoculum was standardized to 0.5 of the MacFarland scale in spectrophotometer, obtaining as a result that the concentrations of 60 and 90% did not present turbidity. The Minimum Bactericidal Concentration (MBC) determined in Mueller-Hinton agar was present from the 60% concentration for the two strains under study. The antimicrobial susceptibility test indicated that all concentrations showed antimicrobial sensitivity and that the concentrations at 30 and 60% were not significantly different, present...