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glucuronoxylan
Glucuronoxylans are the primary components of hemicellulose as found in hardwood trees, for example birch.〔http://www.ipst.gatech.edu/faculty/ragauskas_art/technical_reviews/Chemical%20Overview%20of%20Wood.pdf〕
They are hemicellulosic plant cell wall polysaccharides, containing glucuronic acid and xylose as its main constituents.〔http://www.biology-online.org/dictionary/Glucuronoxylan〕 They are linear polymers of β-D-xylopyranosyl units linked by (1→4) glycosidic bonds, with many of the xylose units substituted with 2, 3 or 2,3-linked glucuronate residue, which are often methylated at position 4. Most of the glucuronoxylans have single 4-O-methyl-α-D-glucopyranosyl uronate residues (MeGlcA) attached at position 2. This structural type is usually named as 4-O-methyl-D-glucurono-D-xylan (MGX).〔http://metacyc.org/META/NEW-IMAGE?object=Glucuronoxylans〕
Angiosperm (hardwood) glucuronoxylans also have a high rate of substitution (70-80%) by acetyl groups, at position 2 and/or 3 of the β-D-xylopyranosyl, conferring on the xylan its partial solubility in water.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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