title: Fragrant volatile sesquiterpenoids isolated from the essential oil of Laggera pterodonta by using olfactory-guided fractionation.
abstract: Chemical composition of the essential oil from Laggera pterodonta (Compositae) was inverstigated. GC/MS Analyses led to the identification of 68 components, representing more than 96% of the total oil. By focusing on the woody note fraction of the essential oil, one new bisabolane-type sesquiterpenoid, bisabola-2,7(14),11-trien-10-ol (1), together with ten known compounds, bisabolol oxide B (2), ylangenol (3), copaborneol (4), guai-11-en-10-ol (5), spathulenol (6), aromadendran-10-ol (7), caryophyllenol (8), 5α,7α-eudesm-11(13)-en-4α-ol (9), γ-costic acid (10), and eudesma-4(15),11(13)-diene-12,5β-olide (11), were isolated by using olfactory-guided fractionation. The structures of the eleven compounds were determined by NMR and MS analyses. All the volatile compounds reported here were isolated for the first time from this plant. On the basis of preliminary odor assessment, the odor of the woody-note fractions of the essential oil was assumed to be due to these isolated sesquiterpenoids.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources of West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, P. R. China (phone: +86-871-65223224; fax: +86-871-65216335); University of the Chinese Academy of Sciences, Beijing 100049, P. R. China.
authors.forename: Jian-Long
authors.initials: JL
authors.lastname: Gu
authors.forename: Zhi-Jian
authors.initials: ZJ
authors.lastname: Li
authors.forename: Hong-Xia
authors.initials: HX
authors.lastname: Zhang
authors.forename: Zhi-Zhi
authors.initials: ZZ
authors.lastname: Du
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009812:Odorants; D009822:Oils, Volatile / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification*; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet; D014835:Volatilization
chemical_list: D009822:Oils, Volatile; D012717:Sesquiterpenes
keywords: Essential oils; Laggera pterodonta; Olfactory-guided fractionation; Sesquiterpenoids