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Dry vs soaked wood: modulating the volatile extractible fraction of oak wood by heat treatments.

Food chemistry (2012-12-26)
Charlie J Duval, Nicolas Sok, Jérémy Laroche, Karine Gourrat, Andréi Prida, Sonia Lequin, David Chassagne, Régis D Gougeon
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Furfural, 99%
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Furfural, ≥98%, FCC, FG
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Furfural, ACS reagent, 99%
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SPME/HPLC Interface, rheodyne valve version
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SPME Sampling Stand, for use with 15 mL vials
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SPME Portable Field Sampler, coating PDMS/DVB
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 75 μm (CAR/PDMS), for use with manual holder, needle size 24 ga
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 24 ga, for use with manual holder
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SPME fiber assembly polyacrylate (PA), df 85 μm (PA), for use with manual holder, needle size 24 ga
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SPME fiber assembly Polydimethylsiloxane (PDMS), df 7 μm (PDMS), needle size 24 ga, for use with manual holder
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SPME fiber assembly, Carbowax-Polyethylene Glycol (PEG) Coating, needle size 23 ga, df 60 μm (PEG), metal alloy fiber, for use with manual holder
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SPME fiber assortment kit 1, for use with manual holder, needle size 24 ga
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SPME fiber assortment kit 2, for use with manual holder, needle size 24 ga
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SPME fiber assortment kit 4, for use with manual holder, size 24 ga
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SPME LC Tips, C18, tray of 96 ea
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SPME fiber assembly Polydimethylsiloxane (PDMS), df 7 μm (PDMS), needle size 24 ga, for use with autosampler
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SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 24 ga, for use with manual holder