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

被引：8

作者：

Magaton, Andreia S. ^{[2
]}

Silva, Teresa Cristina F. ^{[1
]}

Colodette, Jorge Luiz ^{[1
]}

Pilo-Veloso, Dorila ^{[2
]}

Milagres, Flaviana Reis ^{[1
]}

机构：

[1] Univ Fed Vicosa, Lab Celulose & Papel, Dept Engn Florestal, BR-36570000 Vicosa, MG, Brazil

[2] Univ Fed Reconcavo Bahia, Dept Quim, BR-44380000 Cruz Das Almas, BA, Brazil

来源：

HOLZFORSCHUNG | 2013年 / 67卷 / 02期

关键词：

eucalyptus; NMR; SEC; uronic acids; xylans retention; HEMICELLULOSES; METHANOLYSIS; BIRCH; ACIDS;

D O I：

10.1515/hf-2012-0034

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

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 H-1 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 M-w 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.

引用

页码：115 / 122

页数：8

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