Antibacterial essential oils from some Philippine plants
1996
Torres, R.C. (Industrial Technology Development Inst., Bicutan, Taguig, Metro Manila (Philippines). Chemicals and Minerals Div.) Ontengco, D.C. | Balgos, N.S. | Villanueva, M.A. | Lanto, E.A. | Cruz, M.S. | Estrella, R.R. | Santiago, R. | Salud, S.
Essential oils from 18 local plants were screened for its antibacterial activity using the Kirby-Bauer Disk Diffusion Method. Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853 were the bacterial strains used. Findings indicate that essential oils from the oleoresin of Manila elemi, vetiver roots, and Japanese mint leaves yielded very significant antibacterial activity. Staphylococcus aureus and Escherichia coli were strongly inhibited by these oils; while Pseudomonas aeruginosa was weakly inhibited. Moreover, cinnamon, ginger, lemongrass and spearmint oils also exhibited significant antibacterial activity against S. aureus and E. coli. However, no inhibitory effect was observed against P. aeruginosa. Other essential oils studied such as citronella, eucalyptus, ilang-ilang, turmeric, pachouli and annatto. The last two oils exhibited moderate inhibition. Furthermore, the antibacterial activity exhibited by some oils are comparable to the standard (chloramphenicol) used, especially against the gram-positive bacteria. Ginger (36.3 mm), eucalyptus (34.5 mm), elemi (32.8 mm), citronella (34.2 mm) and cinnamon (26.9 mm) oils yields a much higher zone of inhibition against chloramphenicol (23.0 mm)
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