标题：Research on chemical compositions and anti-microbial activity of the essential oil of the rhizome of Kaempferia daklakensis N.H.Tuan & N.D.Trong – A new record from Vietnam flora
摘要：Graphical abstractDisplay OmittedAbstractObjectivesKaempferia daklakensisN.H.Tuan & N.D.Trong (local name Up dat) (Zingiberaceae) was collected at Ea So Nature Reserve, Ea Kar district, Daklak Province, Viet Nam and described as a new record for the country’s flora.MethodsAn essential oil with 0.99% yield (w/w) was extracted from the absolute dry rhizomes by steam distillation as a pleasant smelling yellow oil which was characterized by thin-layer chromatography (TLC) and Gas Chromatography- Mass Spectrometry (GC–MS) and evaluated its antibacterial activity against pathogenic bacteria by agar disk diffusion method.ResultsA total of 38 compounds (accounting for 67.3% of the total oil) were identified. The major components of the essential oils are α-pinene (2, 3.22%), camphene (3, 23.63%), camphor (10, 4.42%), borneol (12, 4.80%), isoborneol (17, 5.77%), ishwarane (21, 3.29%) and 1,8-cineole (8, 2.89%).K. daklakensisrhizome oil possessed inhibitory activity against Gram (+) and Gram (−) microbial strains includingBacillus subtilis, Bacillus cereus, Bacillus pumilus, Staphylococcus aureus, Shigella flexneri, Proteus mirabilis.ConclusionsThis results suggest that the essential oil ofK. daklakensisrhizome could be used for the treatment of some infections by Gram(+) and Gram(−) microorganisms. This paper is considered also as an official announce forKaempferia daklakensisspecies as a new record from Vietnam flora.
关键词：Kaempferia daklakensis;Zingiberaceae;Ea So nature reserve;Ea Kar district;Daklak province
