caryophyllene and hexahydrofarnesylacetone

The hydrodistillation of the aerial parts of Stachys palaestina L. collected in Lebanon in the Kadisha Valley, yielded 0.1% (w/w) of essential oil. GC and GC-MS analyses enabled the identification of 87 compounds representing 90.8% of the total oil. Hexadecanoic acid (10%), hexahydrofarnesyl acetone (6.9%), eugenol (4.3%) and (E)-caryophyllene (4.3%) were the main components. On the whole, the oil was constituted mainly of sesquiterpenes (37.7%), among which sesquiterpene hydrocarbons (20.7%) slightly prevailed over oxygenated sesquiterpenes (17.0%). This is the first report on the chemical composition of S. palaestina essential oil.

Topics: Eugenol; Lebanon; Oils, Volatile; Palmitic Acid; Plant Components, Aerial; Polycyclic Sesquiterpenes; Sesquiterpenes; Stachys; Terpenes

The volatile constituents of the flowerheads of Centaurea nicaeensis All., C. parlatoris Helder and C. solstitialis L. ssp. schouwii (DC.) Dostál were extracted by hydrodistillation and analysed by GC and GC-MS. Altogether 113 components were identified. Fatty acids and hydrocarbons were the most abundant components in the oils. Caryophyllene and caryophyllene oxide were the main compounds of the sesquiterpene fraction. The study on the biological activity of the oils shows no significant activity.

Topics: Bacillus subtilis; Candida albicans; Centaurea; Chromatography, Gas; Flowers; Fusarium; Gas Chromatography-Mass Spectrometry; Italy; Microbial Sensitivity Tests; Oils, Volatile; Palmitic Acid; Plant Extracts; Plant Oils; Polycyclic Sesquiterpenes; Pseudomonas aeruginosa; Saccharomyces cerevisiae; Sesquiterpenes; Terpenes