title: Dry vs soaked wood: modulating the volatile extractible fraction of oak wood by heat treatments.
abstract: The aim of this study was to analyze the impact of the water content of wood on the concentrations of volatile compounds which can be extracted after heat treatments. Head Space-Solid Phase Micro Extraction Gas Chromatography coupled to Mass Spectrometry (HS-SPME GC-MS) has been used to compare the concentrations of six aroma compounds (vanillin, furfural, eugenol, guaïacol and cis- and trans-whisky lactones) in hydroalcoholic extracts of heated oak wood samples either previously soaked in hot water or not. Except for eugenol, concentrations of extracted aromas appeared to be lower in soaked woods than in dry woods for temperatures up to 200 °C. If a delaying effect of water could explain such overall lower extracted concentrations from soaked woods, a PCA analysis revealed that for the longer duration (25 min of heat treatment), the adsorbed water could promote a higher impact of furfural, eugenol and both whisky lactones on the composition of hydroalcoholic extracts, suggesting that alternative mechanisms of thermal modifications of the wood macromolecular network could exist at high temperatures in presence of adsorbed water.
authors.affiliation: Equipe Procédés Alimentaires et Physico-Chimie, UMR A 02.102 PAM AgroSup Dijon/Université de Bourgogne, Institut Universitaire de la Vigne et du Vin, Jules Guyot, Rue Claude Ladrey, BP 27877, 21078 Dijon Cedex, France. lilo.duval@gmail.com
authors.forename: Charlie J
authors.initials: CJ
authors.lastname: Duval
authors.forename: Nicolas
authors.initials: N
authors.lastname: Sok
authors.forename: Jérémy
authors.initials: J
authors.lastname: Laroche
authors.forename: Karine
authors.initials: K
authors.lastname: Gourrat
authors.forename: Andréi
authors.initials: A
authors.lastname: Prida
authors.forename: Sonia
authors.initials: S
authors.lastname: Lequin
authors.forename: David
authors.initials: D
authors.lastname: Chassagne
authors.forename: Régis D
authors.initials: RD
authors.lastname: Gougeon
mesh_terms: D005662:Furaldehyde / Q000032:analysis / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D006139:Guaiacol / Q000032:analysis / Q000302:isolation & purification; D010936:Plant Extracts / Q000032:analysis* / Q000302:isolation & purification*; D029963:Quercus / Q000737:chemistry*; D052617:Solid Phase Microextraction; D013696:Temperature; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000302:isolation & purification*; D014867:Water / Q000032:analysis; D014934:Wood / Q000737:chemistry*
chemical_list: D010936:Plant Extracts; D055549:Volatile Organic Compounds; D014867:Water; D006139:Guaiacol; D005662:Furaldehyde