Essential Oil Compositions and Antimicrobial Activity of the Leaves and Rhizomes of Alpinia calcicola from Vietnam.

The main constituents of I A. calcicola i leaf essential oil were I i -pinene (14.4%), I i -cadinene (9.7%), I i -caryophyllene (7.7%), I i -cadinol (7.0%), and 9 I epi i -( I E i )-caryophyllene (5.1%), whereas I i -cadinol (19.1%), I i -pinene (15.3%), I i -cadinene (10.1%), and I epi i I i -muurolol (9.4%) were found in the rhizome essential oil. It could be seen that terpene compounds predominate in the essential oils, as was previously reported for other I Alpinia i oil samples grown in Vietnam, such as I A. napoensis i [[2], [4]], I A. menghaiensis i [[3]], I A. maclurei i [[3]], I A. globosa i [[5]], and I A. tonkinensis i [[5]]. Moreover, terpenes were also the predominant compounds of other I Alpinia i essential oils reported from other parts of the world, which include I A. kwangsiensis i [[15]] and I A. zerumbet i [[16]]. For example, the yields of the hydrodistilled essential oils of I A. napoensis i leaves, stems, and roots were 0.21%, 0.17%, and 0.25% respectively [[2]], whereas I A. napoensis i rhizome gave oil in a yield of 0.26% [[4]]. [Extracted from the article]