title: New Approach for Differentiating Sessile and Pedunculate Oak: Development of a LC-HRMS Method To Quantitate Triterpenoids in Wood.
abstract: Oak aging is a crucial step in winemaking during which the organoleptic properties of wine are modified. Various parameters affect the chemical composition of oak wood including botanical origin, which has been previously shown to be a determinant factor. This study focused on the development of a LC-HRMS method to assay four recently discovered taste-active triterpenes (three sweet and one bitter). The method was applied to evaluate the effect of oak species (Quercus petraea and Quercus robur) on the concentration of these molecules in wood. The results showed that sessile oak was richer in sweet triterpenes and poorer in the bitter one than pedunculate oak, with high interindividual variations within species. Furthermore, a triterpenoid index was calculated to reveal the triterpenoid composition of oak wood. This index appears to be a promising tool for the unambiguous discrimination of oak species and could offer new insights into oak wood selection by coopers and the monitoring of oak aging by winemakers.
authors.affiliation: Université de Bordeaux , ISVV, EA 4577, Unité de recherche Oenologie, F-33882 Villenave d'Ornon, France.|INRA , ISVV, USC 1366 Oenologie, F-33882 Villenave d'Ornon, France.
authors.forename: Axel
authors.initials: A
authors.lastname: Marchal
authors.affiliation: Seguin Moreau France , Z. I. Merpins, B.P. 94, F-16103 Cognac, France.
authors.forename: Andréi
authors.initials: A
authors.lastname: Prida
authors.affiliation: Université de Bordeaux , ISVV, EA 4577, Unité de recherche Oenologie, F-33882 Villenave d'Ornon, France.|INRA , ISVV, USC 1366 Oenologie, F-33882 Villenave d'Ornon, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Dubourdieu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D016002:Discriminant Analysis; D013058:Mass Spectrometry / Q000379:methods*; D029963:Quercus / Q000737:chemistry* / Q000145:classification; D014315:Triterpenes / Q000737:chemistry*; D014934:Wood / Q000737:chemistry* / Q000145:classification
chemical_list: D014315:Triterpenes
keywords: Orbitrap; bitterness; quercotriterpenosides; sweetness; taste; wine aging