Abstract
The compositions and antimicrobial activity of essential oils from the leaves and rhizomes of Zingiber magang N.S. Lý & Škornièk sp. nov. and Zingiber tamii N.S. Lý & Škornièk. sp. nov. from Vietnam were reported. The essential oils from Z. magang were obtained in yields of 0.12 % (leaf) and 0.18 % (rhizome), while Z. tamii afforded essential oils with yields of 0.15 % and 0.20 %, respectively, for the leaf and rhizome. The leaf essential oil of Z. magang consists of β-pinene (12.3 %) and (E)-nerolidol (10.3 %), while α-selinene (10.5 %), caryophyllene oxide (9.7 %), and neo-intermedeol (7.5 %) were found in the rhizome essential oil. However, the compositions of essential oils from the leaf and rhizome of Z. tamii comprised mainly of β-pinene (53.8 % and 55.4 %), and sabinene (12.3 % and 12.5 %), respectively. The rhizome essential oil of Z. magang displayed promising antimicrobial activity against Enterococcus faecalis ATCC 299212 and Staphylococcus aureus ATCC 25923 with the Minimum inhibitory concentration (MIC) values of 9.99 μg/mL and 9.67 μg/mL, respectively. In addition, essential oil from the leaf of Z. tamii was the most active against Escherichia coli ATCC 25922 (MIC 44.38 μg/mL) and Candida albicans ATCC 10231 (MIC, 45.62 μg/mL). This is the first report on the chemical compositions and antimicrobial activity of essential oils of Z. magang and Z. tamii.
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