Abstract
The aim of this work was to study the effect of steam explosion conditions (severity factor, pH of pre-soaking medium) on the extraction of high molecular weight hemicelluloses from spruce sawdust. The highest yields were obtained at severity factor of 3.65 (47 and 44 mg/g or dry wood in neutral and basic mediums respectively). Treatment at high severity gave lower yield with lower molecular mass. A high extraction selectivity of high molecular weight hemicelluloses was observed as a function of the medium of the impregnation step: after a basic impregnation, ∼90% of extracted hemicelluloses are arabinoglucuronoxylans (∼70 kDa) whereas after a water impregnation ∼85% of galactoglucomannans (∼28 kDa) were recovered. FTIR, HSQC 2D and acetyl content analysis show that the GGM isolated are highly acetylated, with an acetylation rate very closed to the values reported for native AcGGM.
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