bisabolol and sabinene

Essential oil samples obtained by steam distillation of the whole aerial parts and roots of Selinum wallichianum Raizada & Saxena (syn Selinum tenuifolium) growing wild in the Himalayan region of Uttarakhand, India, were analysed by capillary gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS). A total of 24 and 43 constituents representing 97.0 and 95.4% of the oil composition, respectively, were identified. Both the oil samples were constituted mainly of monoterpene hydrocarbons 68.1 and 77.4%, with sabinene 31.0 and 11.5%, β-phellandrene 18.2 and 34.5%, α-bisabolol 16.0 and 1.8% and α-phellandrene 3.5 and 11.2%, respectively, as a major constituents. Presence of sabinene, β-phellandrene, α-phellandrene and complete absence of previously reported 3,5-nonadiyne (53.8-90.0%) justifies it to be a new chemotype of S. wallichianum.

Topics: Apiaceae; Bicyclic Monoterpenes; Cyclohexane Monoterpenes; Cyclohexenes; Gas Chromatography-Mass Spectrometry; India; Monocyclic Sesquiterpenes; Monoterpenes; Oils, Volatile; Sesquiterpenes; Terpenes

The chemical composition of the essential oils obtained by hydrodistillation from the pastinocello carrot, Daucus carota ssp. major (Vis.) Arcang. (flowers and achenes), and from nine different commercial varieties of D. carota L. ssp. sativus (achenes) was investigated by GC/MS analyses. Selective breeding over centuries of a naturally occurring subspecies of the wild carrot, D. carota L. ssp. sativus, has produced the common garden vegetable with reduced bitterness, increased sweetness, and minimized woody core. On the other hand, the cultivation of the pastinocello carrot has been abandoned, even if, recently, there has been renewed interest in the development of this species, which risks genetic erosion. The cultivated carrot (D. carota ssp. sativus) and the pastinocello carrot (D. carota ssp. major) were classified as different subspecies of the same species. This close relationship between the two subspecies urged us to compare the chemical composition of their essential oils, to evaluate the differences. The main essential-oil constituents isolated from the pastinocello fruits were geranyl acetate (34.2%), α-pinene (12.9%), geraniol (6.9%), myrcene (4.7%), epi-α-bisabolol (4.5%), sabinene (3.3%), and limonene (3.0%). The fruit essential oils of the nine commercial varieties of D. carota ssp. sativus were very different from that of pastinocello, as also confirmed by multivariate statistical analyses.

Topics: Acetates; Acyclic Monoterpenes; Alkenes; Bicyclic Monoterpenes; Cluster Analysis; Cyclohexenes; Daucus carota; Flowers; Fruit; Gas Chromatography-Mass Spectrometry; Limonene; Monocyclic Sesquiterpenes; Monoterpenes; Oils, Volatile; Principal Component Analysis; Sesquiterpenes; Terpenes