Terpenoid composition of essential oil from a new chemotype of <i>Selinum wallichianum</i> Raizada & Saxena

<p>Essential oil samples obtained by steam distillation of the whole aerial parts and roots of <i>Selinum wallichianum</i> Raizada & Saxena (syn <i>Selinum tenuifolium</i>) 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%, <i>β</i>-phellandrene 18.2 and 34.5%, α-bisabolol 16.0 and 1.8% and <i>α</i>-phellandrene 3.5 and 11.2%, respectively, as a major constituents. Presence of sabinene, <i>β</i>-phellandrene, <i>α</i>-phellandrene and complete absence of previously reported 3,5-nonadiyne (53.8–90.0%) justifies it to be a new chemotype of <i>S. wallichianum</i>.</p>