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KMID : 0613820140240030266
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Journal of Life Science
2014 Volume.24 No. 3 p.266 ~ p.273
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Chemical Composition and in vitro Antimicrobial and Antioxidant Activities of Commercially Available Essential Oils against Multidrug Resistant Bacteria
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Yoo Yeong-Wol
Lee Hyo-Jeong
Kim Seung
Bae Min-Suk
Lee Mi-Ja
Shim Jung-Hyun
Cho Seung-Sik
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Abstract
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In the present study, the chemical compositions and antimicrobial and antioxidant activities of commercially available essential oils in Korea were investigated. The essential oils were analyzed by gas chromatography-mass spectrometry (GC-MS). The results demonstrated that they exhibit a broad spectrum of antimicrobial activities against gram positive, gram negative, and multidrug resistant (MDR) strains. The antimicrobial activity of five of the essential oils against 40 organisms was assessed using the minimum inhibitory concentration (MIC). The MIC values were in the ranges of 0.0625-0.5% (v/w) for lemongrass and manuka, 0.03125-1.0% (v/w) for tea tree, 0.0625-1.0% (v/w) for thyme, and 1-4% (v/w) for ravensara, depending on the pathogens studied. This study revealed that, among the essential oils tested, lemongrass and thyme oil showed broad antimicrobial activity against infectious bacteria. The antioxidant activities and the reducing power of the essential oils were determined with a 1, 1-diphenyl-2-picrylhydrazyl (DPPH) assay. Thyme oil exhibited the strongest antioxidant activity comparing with ascorbic acid. This is the first report on the chemical compositions and antimicrobial activities of commercially available essential oils against infectious bacteria and MDR strains acquired from Korean hospitals.
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KEYWORD
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Chromatography-mass spectrometry (GC-MS), essential oil, multidrug resistant bacteria
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