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Licensed Unlicensed Requires Authentication Published by De Gruyter August 8, 2007

Characterization of non-cellulosic glucans in Eucalyptus globulus Labill. wood and kraft pulp

Sara A. Lisboa, Dmitry V. Evtuguin and Carlos Pascoal Neto
From the journal

Abstract

The amount of non-cellulosic glucans in Eucalyptus globulus wood (approx. 4.5%) was assessed by extraction of sawdust with a 0.5 M NaOH solution at 90–120°C and the structural features were elucidated in a glucan-enriched polysaccharide fraction isolated by hot water extraction (120°C, 2 h). Isolated soluble glucans were characterized by wet chemistry methods and a set of 1D and 2D NMR techniques. The major proportion of glucans consisted of amylose (20%) and amylopectin (80%), although a small proportion of β-(1→3)-glucan (<0.2% on wood weight) was also detected. Although glucans are easily removed in the initial phase of kraft pulping, notable amounts were found in unbleached pulp and it was supposed that in the final stage of kraft pulping a fraction of α-glucan is precipitated onto the fiber surface and contributes to the pulp yield.


Corresponding author. CICECO and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal

Received: 2007-1-30
Accepted: 2007-6-7
Published Online: 2007-08-08
Published in Print: 2007-8-1

©2007 by Walter de Gruyter Berlin New York

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