The three Eucalyptus species investigated in the present study
showed a large variation in their chemical composition, even for
the two E. olida samples grown in different regions. The essential
oils were dominated by a few volatile compounds, and in the case
of E. olida, just one compound, (E)-methyl cinnamate. The essential
oils displayed a variable degree of antimicrobial activity with E.
staigeriana oil having the highest activity. Gram-positive bacteria
were found to be in general more sensitive to the essential oils
than Gram-negative bacteria. S. aureus was the most sensitive
strain while P. aeruginosa was the most resistant. The particularly
high antimicrobial activity of E. staigeriana essential oil, especially
against the Gram-positive pathogen S. aureus, suggests that it may
have a promising prospect for applications in food and potentially,
pharmaceutical products. Future studies could be directed at
investigating the minimum inhibitory concentration (MIC) of the
essential oils which have exhibited antimicrobial properties,
extending the antimicrobial test to a wider range of microorganisms
and applying the essential oils in food and possibly also pharmaceutical
products
The three Eucalyptus species investigated in the present studyshowed a large variation in their chemical composition, even forthe two E. olida samples grown in different regions. The essentialoils were dominated by a few volatile compounds, and in the caseof E. olida, just one compound, (E)-methyl cinnamate. The essentialoils displayed a variable degree of antimicrobial activity with E.staigeriana oil having the highest activity. Gram-positive bacteriawere found to be in general more sensitive to the essential oilsthan Gram-negative bacteria. S. aureus was the most sensitivestrain while P. aeruginosa was the most resistant. The particularlyhigh antimicrobial activity of E. staigeriana essential oil, especiallyagainst the Gram-positive pathogen S. aureus, suggests that it mayhave a promising prospect for applications in food and potentially,pharmaceutical products. Future studies could be directed atinvestigating the minimum inhibitory concentration (MIC) of theessential oils which have exhibited antimicrobial properties,extending the antimicrobial test to a wider range of microorganismsand applying the essential oils in food and possibly also pharmaceuticalproducts
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