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Published in: Cellulose 4/2023

12-01-2023 | Original Research

Water-insoluble and soluble glucuronoxylans from eucalyptus pulp and their behavior in alkaline pulping

Authors: Min Luo, Shenlong Tian, Xingyu Lan, Shiyu Fu

Published in: Cellulose | Issue 4/2023

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Abstract

Hemicellulose plays a versatile role in plant cell wall by linking cellulose and lignin or impeding lignin removal from sustainable cellulosic fibers. Herein, hemicellulose fractions (glucuronoxylans) of Eucalyptus pulp cooked to various cooking degree were extracted by potassium hydroxide solution and purified with ethanol. The glucuronoxylans are divided into water-insoluble (GXI) and -soluble (GXS) fractions. The release or degradation behavior of glycosylated side-chain of hemicellulose in alkaline cooking was explored according to the separate discussion of GXI and GXS, and take consideration of the effect of extraction temperature on polysaccharide degradation. The GXI is constructed of basically straight xylan chain with high linearity, and GXS contains multi-branches xylan chain. The harsher cooking conditions (corresponding to H factors 317, 586 and 904) and alkaline-extraction temperature significantly influenced the composition and structure, leading more glycosyl side chains removal. More content glucuronic acid (6.04–11.26%) in GXS, which may relate to high branch on xylans and great solubility, while less of glucuronic acid (MeGlcA, 2.28–5.48%) in GXI was accounting for the poor solubility. The glycosyl analyses of the two fractions extracted from different pulp showed that the hexenuronic acid (HexA) converted from MeGlcA in GXI was retained during cooking, while that in GXS was easier to be removed in pulping process.

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Metadata
Title
Water-insoluble and soluble glucuronoxylans from eucalyptus pulp and their behavior in alkaline pulping
Authors
Min Luo
Shenlong Tian
Xingyu Lan
Shiyu Fu
Publication date
12-01-2023
Publisher
Springer Netherlands
Published in
Cellulose / Issue 4/2023
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-023-05049-3

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