The study In vitro antibacterial activity of some plant essential oils tested 21 essential oils against six bacterial species.
The essential oils were screened against four gram-negative bacteria (Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus vulgaris) and two gram-positive bacteria Bacillus subtilis and Staphylococcus aureus at four different concentrations (1:1, 1:5, 1:10 and 1:20) using disc diffusion method.
Out of 21 essential oils tested, 19 oils showed antibacterial activity against one or more strains. Cinnamon, clove, geranium, lemon, lime, orange, and rosemary oils showed significant inhibitory effect.
Cinnamon oil showed promising inhibitory activity even at low concentration, whereas aniseed, eucalyptus, and camphor oils were least active against the tested bacteria.
In general, B. subtilis was the most susceptible. On the other hand, K. pneumoniae exhibited low degree of sensitivity.
Source: Seenivasan Prabuseenivasan, Manickkam Jayakumar, and Savarimuthu Ignacimuthu. "In vitro antibacterial activity of some plant essential oils." BMC Complementary and Alternative Medicine 2006, 6:39.
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