Location of Lignin-Bonded Pectic Polysaccharides
作者:
JamesL. Minor,
期刊:
Journal of Wood Chemistry and Technology
(Taylor Available online 1991)
卷期:
Volume 11,
issue 2
页码: 159-169
ISSN:0277-3813
年代: 1991
DOI:10.1080/02773819108050268
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The hypothesis that galactose and arabinose pectic substances are disributed with lignin throughout wood cell walls was tested by analyzing a high-yield loblolly pine kraft pulp that had been separated into middle-lamella-rich and secondary-wall-rich fractions. The fractions were first treated with a polysaccharidase enzyme mixture to obtain “enzyme lignins.” The structures of the galactose and arabinose oligomers remaining attached to the lignin were determined by methylation analysis. The 1→4 linked galactose structure, characteristic of pectic materials, was present in significant amounts in the middle-lamella-rich fraction, but to only a very small extent in the secondary-wall-rich fraction. In contrast, the pectic arabinan 1→5 linked structure was a significant proportion of the arabinose from both fractions. The 1→5 linked arabinose structure can arise from a linkage of arabinoxylan to lignin through the 5 position of the arabinose substituent as well as from pectic structures. After partial acid hydrolysis, approximately half the remaining arabinose in the secondary-wall-rich fraction was attached as monomeric units to lignin through the 5 position.
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