Steam explosion process for the selective extraction of hemicelluloses polymers from spruce sawdust

•Steam explosion at mild conditions permits the extraction of hemicellulose polymers.•Highest yields of hemicellulose polymers were obtained at severity factor of 3.65.•High selectivity of extraction was observed as a function of pH of presoaking step.•Acetylated galactoglucomannas polymers were ext...

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Bibliographic Details
Published inIndustrial crops and products Vol. 141; p. 111757
Main Authors Chadni, Morad, Grimi, Nabil, Bals, Olivier, Ziegler-Devin, Isabelle, Brosse, Nicolas
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2019
Elsevier
Subjects
Arabinoglucuronoxylans
Chemical and Process Engineering
Chemical Sciences
Engineering Sciences
Galactoglucomannans
Hemicellulose
Materials
Organic chemistry
Polymers
spruce sawdust
Steam explosion
HMF
Hemicellulose
AD
NREL/TP
Galactoglucomannans
kDa
Mw
GGM
M
spruce sawdust
Ac-GGM
SD
AGX
SE
DW
SF
Steam explosion
PD
FTIR
SPS
Arabinoglucuronoxylans
WPS
HPLC
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Summary:•Steam explosion at mild conditions permits the extraction of hemicellulose polymers.•Highest yields of hemicellulose polymers were obtained at severity factor of 3.65.•High selectivity of extraction was observed as a function of pH of presoaking step.•Acetylated galactoglucomannas polymers were extracted after neutral presoaking.•High molecular mass arabinoglucuronoxylans were extracted after basic presoaking. 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.
ISSN:0926-6690
1872-633X
DOI:10.1016/j.indcrop.2019.111757