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Licensed Unlicensed Requires Authentication Published by De Gruyter September 4, 2012

Behavior of xylans from Eucalyptus species. Part 1. The influence of structural features of eucalyptus xylans on their retention in kraft pulp

Andréia S. Magaton, Teresa Cristina F. Silva, Jorge Luiz Colodette, Dorila Piló-Veloso and Flaviana Reis Milagres
From the journal Holzforschung

Abstract

4-O-methylglucuronoxylans were isolated from the wood and pulp of different Eucalyptus species (E. dunni, E. grandis, E. nitens, E. urograndis and E. urophylla) and characterized by 1H NMR spectroscopy and size-exclusion chromatography (SEC). The content of 4-O-methylglucuronic acid (MeGlcA) varied between the eucalyptus species from 1.90 to 2.80 expressed as MeGlcA/10 xyloses, whereas in the pulp, the total uronic acid content was approximately 1.02, from which the half was hexenuronic acid (HexA). From the MeGlcA linked to the xylan chain 9–26% are substituted in position O-2 by hexose units. The Mw of the xylans extracted from wood ranged between 26.1 and 28.4 kDa. The retention of 4-O-methylglucuronoxylans (51.3–58.7%) during kraft pulping was high, and the retention is related to the content of MeGlcA group, the content of MeGlcA group substituted at O-2, and the average molecular weight of the xylans. The parameters observed affect the overall pulp yield and pulp properties.


Corresponding author: Teresa Cristina F. Silva, Departamento de Engenharia Florestal, Laboratório de Celulose e Papel, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil, Phone: +55 31 3899 2088

Received: 2012-2-27
Accepted: 2012-8-8
Published Online: 2012-09-04
Published in Print: 2013-02-01

©2013 by Walter de Gruyter Berlin Boston