A Few of the Latest Research Publications on Essential Oils and Aromatherapy
Here's a few interesting scientific studies using essential oils:
Influence of cinnamon and clove essential oils on the D- and z-values of Escherichia coli O157:H7 in apple cider
Escherichia coli O157:H7 has become a concern within the apple cider industry. The purpose of this study was to screen several essential oils and isolated components for antimicrobial activity against E. coli O157:H7 in tryptic soy broth at neutral and acidic pH and to assess the effect of these additives on the D-value of E. coli O157:H7 in apple cider in combination with mild heat treatments. Cinnamon oil and clove oil strongly inhibited the growth of E. coli O157:H7 at neutral and acidic pH, (R)-(-)-carvone and (S)-(-)-perillaldehyde were moderately inhibitory at both pH 7.2 and pH 4.5, and citral and geraniol displayed moderate activity at pH 4.5 only. Lemon oil, methyl jasmonate, and p-anisaldehyde displayed little or no antibacterial activity. A synergistic effect between the essential oils and the lower pH of the growth medium was evident by consistently lower MICs at pH 4.5. Cinnamon and clove oils (0.01%, vol/vol) were further tested in apple cider in combination with mild heat treatments for the practical control of E. coli O157:H7 in apple cider. The addition of either essential oil resulted in lower D-values than those for cider alone, suggesting a synergistic effect and the potential efficacy of a mild heat treatment for apple cider.
Potential of rosemary oil to be used in drug-resistant infections.
OBJECTIVE: To evaluate the antimicrobial activity potential of the essential oil of rosemary specifically for its efficacy against the drug-resistant mutants of Mycobacterium smegmatis, Escherichia coli, and Candida albicans. METHOD: Antibacterial, antifungal, and drug resistance-modifying activity was evaluated both qualitatively and quantitatively following disc diffusion and broth dilution assay procedures. RESULTS: The rosemary essential oil was found to be more active against the gram-positive pathogenic bacteria except E. faecalis and drug-resistant mutants of E. coli, compared to gram-negative bacteria. Similarly, it was found to be more active toward nonfilamentous, filamentous, dermatophytic pathogenic fungi and drug-resistant mutants of Candida albicans. CONCLUSION: Our findings suggest that characterization and isolation of the active compound(s) from the rosemary oil may be useful in counteracting gram-positive bacterial, fungal, and drug-resistant infections.
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