Structure of hardwood glucuronoxylans: modifications and impact on pulp retention during wood kraft pulping
authors Pinto, PC; Evtuguin, DV; Neto, CP
nationality International
journal CARBOHYDRATE POLYMERS
author keywords glucuronoxylan; E. globulus; kraft pulping; kraft pulp; xylan structure; O-acetylation
keywords EUCALYPTUS-GLOBULUS LABILL; HEXENURONIC ACID; POLYSACCHARIDES; SPECTROSCOPY
abstract The behaviour of different hardwood glucuronoxylans during the kraft pulping process was investigated. Woods and pulps xylans were isolated and characterized by size exclusion chromatography, methylation (linkage) analysis and H-1 NMR. Eucalyptus globulus and Eucalyptus urograndis showed xylan retention significantly higher than that of Betula pendula. The higher retention of Eucalyptus xylans was assigned to (i) their higher average molecular weight (31 against 24 KDa in B. pendula) and to (ii) the presence of O-2 substituted 4-O-methyl-alpha-D-glucuronic acid groups ([-> 2)-GlcpA-(1 ->]) with galactopyranosyl/glucopyranosyl residues belonging to fragments of galactan/glucan chains that were absent in B. pendula xylans. A significant part of uronic acids, particularly [ -> 2)-GlcpA-(1 ->] units, remain in fibres until the end of pulping. The acetylation degree and distribution of acetyl groups between Xylp units, in general terms, was similar in the three types of xylans. Unexpectedly, about 20% of the acetyl groups persisted in pulps xylans till the end of pulping. (c) 2005 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2005
volume 60
issue 4
beginning page 489
ending page 497
digital object identifier (doi) 10.1016/j.carbpol.2005.03.001
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000230075300009
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journal analysis (jcr 2019):
journal impact factor 7.182
5 year journal impact factor 6.89
category normalized journal impact factor percentile 96.638
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