Interactions of the Beechvood Xylan Component with Other Cell Wall Polymers

Autor:	Anna Ebringerová, Zdena Hromádková, Juraj Alföldi, Marta Kačuráková
Rok vydání:	1996
Předmět:	chemistry.chemical_classification General Chemical Engineering Sodium chlorite General Chemistry Polymer Galactan Polysaccharide Xylan Cell wall chemistry.chemical_compound chemistry Sodium hydroxide Organic chemistry General Materials Science Cellulose
Zdroj:	Journal of Wood Chemistry and Technology. 16:221-234
ISSN:	1532-2319 0277-3813
DOI:	10.1080/02773819608545805
Popis:	ABTRACT Sodium chlorite holocellulose of beechwood was extracted in succession with aqueous ammonia solutions of increasing concentration (1–26% NH4OH), and finally with 5% sodium hydroxide. The polymeric fractions obtained were composed mainly of 4-0-methylglucuronoxylan polymers which occur in two distinct molecular populations. The 1% NH4OH-extract contained the most accessible polysaccharide fraction which represents a mixture of O-acetylated 4-0-methylglucuronoxylan, residual lignin, cellulose fragments and pectic polysaccharides of the rhamnogalacturonan type containing arabinan and galactan chains. A 4-0-methylglucuronoxylan-polygalacturonan complex with a minor proportion of neutral sugars and residual lignin was isolated from the 10% NH4OH-extract. The results suggest that some of the residual lignin and pectic polysaccharides are bound by alkali-stable linkages to xylan and/or cellulose chains in the cell-wall complex.
Databáze:	OpenAIRE
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