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The current study describes chemical compositions and antimicrobial activity of essential oils from the rhizome of two Vietnamese ginger plants  Newmania orthostachys  N.S. Lý &amp; Škorničk. and  Newmania serpens  N.S. Lý &amp; Škorničk. 49 compounds (98.4%) were identified in  N. orthostachys  rhizome oil, whereas 54 compounds (93.4%) were identified in  N. serpens  rhizome oil.  N. orthostachys  rhizome essential oil was dominated by monoterpene hydrocarbons (74.2%), in which β-pinene (35.7%), α-pinene (13.4%), sabinene (8.0%), camphene (6.7%), and limonene (5.1%) were characteristic compounds. Monoterpene hydrocarbons (33.5%) and sesquiterpene hydrocarbons (44.1%) represented  N. serpens  rhizome essential oil, as well as β-pinene (18.5%), bicyclogermacrene (12.4%), β-selinene (8.2%) were the principal compounds. In an antimicrobial assay against three tested Gram-positive bacteria  Enterococcus faecalis  ATCC 29212,  Staphylococcus aureus  ATCC 25923, and  Bacillus cereus  ATCC 14579, both two essential oils showed the minimum inhibitory concentration (MIC) values of 16-64 µg/mL lower than those of positive control Streptomycin (MIC 128-256 µg/ml). These two essential oils with the MIC values of 8-16 µg/mL are also better than the positive control cycloheximide (MIC 32 µg/mL) against the yeast  Candida albicans  ATCC 10231.

journal of essential oil bearing plants

Essential Oils of Two Ginger Plants  Newmania orthostachys  N.S. Lý &amp; Škorničk. and  N. serpens  N.S. Lý &amp; Škorničk.: Chemical Compositions and Antimicrobial Activity