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首页> 外文期刊>Journal of Wood Chemistry and Technology >Behavior of Eucalyptus Wood Xylans across Kraft Cooking
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Behavior of Eucalyptus Wood Xylans across Kraft Cooking

机译：桉木木聚糖在牛皮纸蒸煮过程中的行为

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摘要

The 4-0-methylglucuronoxylans isolated from wood, pulp, and black liquor from six eucalyptus wood species were characterized. The 'H nuclear magnetic resonance (NMR) studies revealed that all eucalyptus wood xylans contain O-2-substituted 4-0-methylglucuronic acid (MeGlcA) groups with hexose residues (9-26%). Their molecular weight (Mw) and polydispersity varied in the range of 26,083-28,405 g.mor' and 1.13-1.17, respectively. The xylan retention during pulping increased with increasing degree of MeGlcA substitution in the xylose ring. An average of 54% xylans was retained in the pulp and the remaining 46% were degraded and/or dissolved in the black liquor (39% degraded and 7% dissolved). The average Mw of the xylans retained in the pulp and dissolved in the black liquor is influenced by pulp kappa number and averaged 20,134 and 14,778 g.mor1, respectively, at kappa 17. The average substitution degree of uronic acids, including MeGlcA and hexenuronic acids (HexA) in the xylans isolated from pulps (kappa 17) and black liquors were 1.05 and 1.13/10 xyloses, respectively. Of the total uronic acids present in the six original woods, an average of 36% w/w was retained in the pulps.
机译：从6种桉木木材的木材，纸浆和黑液中分离出4-0-甲基葡糖醛酸木聚糖。 'H核磁共振（NMR）研究表明，所有的桉木木聚糖均含有带有己糖残基（9-26％）的O-2-取代的4-0-甲基葡糖醛酸（MeGlcA）基团。它们的分子量（Mw）和多分散性分别在26,083-28,405 g.mor'和1.13-1.17的范围内变化。制浆过程中木聚糖的保留量随木糖环中MeGlcA取代程度的增加而增加。纸浆中平均保留了54％的木聚糖，其余46％的木聚糖被降解和/或溶解在黑液中（39％的降解和7％的溶解度）。保留在纸浆中并溶解在黑液中的木聚糖的平均Mw受纸浆中kappa值的影响，在kappa 17时分别平均为20,134和14,778 g.mor1。从果肉（kappa 17）和黑液中分离出的木聚糖中的（HexA）分别为1.05和1.13 / 10木糖。在六个原始木材中存在的总糖醛酸中，纸浆中平均保留了36％w / w。

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