Search

This paper reports the chemical constituents of essential oils from various parts of Decaspermum parviflorum (Lam.) J. Scott. (Myrtaceae) from Vietnam. The essential oils were obtained by hydrodistillation and analyzed by gas chromatography with flame ionization detection (GC-FID) and gas chromatography coupled to mass spectrometry (GC/MS). The main constituents of the oils were β-elemene (1.68-4.14%), caryophyllene (14.53-43.98%), humulene (3.99-10.74%), eudesma-4(14),(11)-diene (4.83-17.46%), a-selinene (3.65-13.60%), cadina- 1(10),4-diene (1.0-3.17%), and seline-3,7(11)-diene (1.13-3.20%). Caryophyllene oxide (2.38-3.63%), ylangene (1.22-3.20%), guaia-3,9- diene(1.46-4.50%), eudesma-4(14)-en-11-ol (2.07-2.24%), neointermedeol (1.39-3.25%), aromadendrene oxide-(2) (1.05-1.65%), and naphthalene,1,2,3,4,4a,5,6,7-octahydro-4a,8-dimethyl-2-(1-methylethenyl)- (0.73-2.47%), which were identified only in the flower and fruit. Ocimene (11.87%) and -elemene (37.02%) were identified only in the flower. Copaene (8.27%) was identified only in the leaf. This is the first report of the chemical constituents of essential oils from the leaf, fruit, and flower of D. parviflorum, and these constituents differ from those reported for other Decaspermum oils. [ABSTRACT FROM AUTHOR]

Essential oils produced from a population of Artemisia vulgaris of Vietnamese origin cultivated near Hanoi were subjected to analysis by GC, GC/MS and 13C-NMR. The oils were found to contain oxygenated monoterpenes as major components (1,8-cineole, camphor and a-terpineol). The composition of these oils differed from that previously reported for Vietnamese A. vulgaris oil. Only slight differences in the composition of the oil were observed along the vegetative life of the plant. No significant difference was observed between compositions of leaf and flower oils. In addition, the combination of retention indices, GC/MS and 13C-NMR spectroscopy allowed the identification of unusual sesquiterpenes such as presilphiperfolan-9α-ol as a minor component. [ABSTRACT FROM AUTHOR]