Hemicelluloses in Hardwoods Growing on Southern Pine Sites
Keywords:
Southern hardwoods, hemicelluloses, chemical analysis, carbohydrates, pentoses, hexoses, xylans, glucomannansAbstract
Aspects of the chemistry of the two more common hemicelluloses found in hardwoods growing on southern pine sites are outlined. The 4-O-methylglucuronoxylans have been investigated chemically by several groups of workers and have been shown to consist of an essentially linear backbone of 1,4-β-linked D-xylopyranose residues. To this backbone are attached in a random fashion, α-linked 4-O-methyl-D-glucuronopyranosyl residues through position 2 of about one in ten of the D-xylopyranosyl groups. O-Acetyl residues may also be present. The glucomannans have received less attention. They consist of essentially linear polymers formed of 1,4-β-linked-D-glucopyranose and 1,4-β-linked-D-mannopyranose residues joined in random sequence and may also contain O-acetyl residues. The ratio of the sugars varies between 1:2 and 1:1.References
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