title: Glycosidically bound volatiles and flavor precursors in Laurus nobilis L.
abstract: Glycosidically bound volatile compounds in different parts (leaves and buds) of Laurus nobilis L. were investigated. After isolation of extracts obtained by Amberlite XAD-2 adsorption and methanol elution, glycosides were analyzed after enzymatic hydrolysis by GC-MS or directly after trifluoroacetyl (TFA) derivatization by GC-MS in EI and NCI mode. In the leaves most of the glycosidically bound volatiles occur as beta-D-glucopyranosides. Among the disaccharides, primeverosides are predominant; smaller amounts of alpha-L-arabinofuranosyl-beta-D-glucopyranosides, rutinosides, and vicianocides could also be identified. Major aglycons comprised benzyl alcohol, some linalool-diols, 2-hydroxy-1,8-cineole and its derivatives such as 2,3-dehydro-1,8-cineole, sobrerols, and menthadien-8-ols. Among the identified nor-carotenoids, 3-oxo-alpha-ionol, the corresponding 7,8-dihydro derivative, and vomifoliol are predominant in leaves. 3-Hydroxy-beta-damascone and 3-hydroxy-7,8-didehydro-beta-ionol, precursors of the sensorially active damascenone, were identified only in the buds.
authors.affiliation: Faculty of Forestry, Zonguldak Karaelmas University, 74100 Bartin, Turkey. ayben_kilic@hotmail.com
authors.forename: Ayben
authors.initials: A
authors.lastname: Kilic
authors.forename: Hubert
authors.initials: H
authors.lastname: Kollmannsberger
authors.forename: Siegfried
authors.initials: S
authors.lastname: Nitz
mesh_terms: D035264:Flowers / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006027:Glycosides / Q000378:metabolism*; D027442:Laurus / Q000737:chemistry*; D009812:Odorants / Q000032:analysis*; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D014835:Volatilization
chemical_list: D006027:Glycosides; D010936:Plant Extracts