Oregano exerted its bactericidal activity at 0.125% (vol/vol) on
both strains of Staphylococcus and Listeria, after 48 h producing a
significant reduction (P < 0.05) in microbial counts that was greater
than 4 and 7 log respectively. The same concentration of Oregano
had different effects on the two Gram-negative bacteria: it showed
its bactericidal activity on Salmonella ATCC and on Campylobacter
HSD, but had bacteriostatic action on Salmonella HSD and
Campylobacter ATCC.
T. vulgaris EO at 0.125% (vol/vol) showed bactericidal activity on
both the Gram-negative after 24 h of incubation, while the percentage
able to kill the Gram-positive was higher, than the Gramnegative
one, at 0.25% (vol/vol). T. vulgaris showed a strong antimicrobial
activity against the four pathogenic bacteria with a MIC
0.5% (vol/vol). Different MIC obtained by other authors (Burt,
2004; Oussalah, Caillet, Saucier, & Lacroix, 2007) are probably
due to different characteristics of the EOs used, thanks to the large
variability of the chemical composition of each essential oil
chemotype.
Oregano exerted its bactericidal activity at 0.125% (vol/vol) onboth strains of Staphylococcus and Listeria, after 48 h producing asignificant reduction (P < 0.05) in microbial counts that was greaterthan 4 and 7 log respectively. The same concentration of Oreganohad different effects on the two Gram-negative bacteria: it showedits bactericidal activity on Salmonella ATCC and on CampylobacterHSD, but had bacteriostatic action on Salmonella HSD andCampylobacter ATCC.T. vulgaris EO at 0.125% (vol/vol) showed bactericidal activity onboth the Gram-negative after 24 h of incubation, while the percentageable to kill the Gram-positive was higher, than the Gramnegativeone, at 0.25% (vol/vol). T. vulgaris showed a strong antimicrobialactivity against the four pathogenic bacteria with a MIC0.5% (vol/vol). Different MIC obtained by other authors (Burt,2004; Oussalah, Caillet, Saucier, & Lacroix, 2007) are probablydue to different characteristics of the EOs used, thanks to the largevariability of the chemical composition of each essential oilchemotype.
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