Glycosidically bound volatiles and flavor precursors in Laurus nobilis L.
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.
Kilic
Ayben
A
Faculty of Forestry, Zonguldak Karaelmas University, 74100 Bartin, Turkey. ayben_kilic@hotmail.com
Kollmannsberger
Hubert
H
Nitz
Siegfried
S
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
D006027:Glycosides; D010936:Plant Extracts