Isolation and structural characterization of polysaccharides dissolved in Eucalyptus globulus kraft black liquors
authors Lisboa, SA; Evtuguin, DV; Neto, CP; Goodfellow, BJ
nationality International
journal CARBOHYDRATE POLYMERS
author keywords Eucalyptus globulus; kraft pulping; black liquor; xylan; structural analysis; NMR spectroscopy
keywords C-13 NMR-SPECTROSCOPY; PULPING CONDITIONS; CELLULOSE FIBRES; POTATO STARCH; LIGNIN; HEMICELLULOSES; BEHAVIOR; H-1; SORPTION; LABILL
abstract Polysaccharides dissolved in black liquors from Eucalyptus globulus kraft pulping were isolated by acid precipitation, analysed for monosaccharide composition and structurally characterized by methylation analysis and NMR spectroscopy. The precipitated oligo- and polysaccharides, representing 20% of the dissolved and/or degraded wood polysaccharides are essentially composed of xylan and amylopectin. The xylan dissolved in the alkaline black liquor showed a M, of about 17-19 kDa as revealed by GPC analysis. The major part of the 4-O-methylglucuronic residues in the xylan from black liquor were degraded to hexenuronic (4-deoxy-beta-L-threo-hex4-enopyranosyluronic acid) units, which was not found to be so pronounced in the case for xylan in the corresponding kraft pulps. The overall structural and molecular weight features of both black liquor and pulp xylans during the kraft pulping are discussed. (c) 2004 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2005
volume 60
issue 1
beginning page 77
ending page 85
digital object identifier (doi) 10.1016/j.carbpol.2004.11.024
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000228351700011
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journal impact factor 5.158
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