Xylose in pyranose form.
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In several hardwood species, about 60% to 70% of xylose residues are esterified with acetic acid, and up to 2.7% of the dry matter of grasses consists of O-acetyl groups linked to the C-2 or C-3 of the xylopyranose residues (Thomson, 1993).
The peak heights and areas of the 1510 and 1739 [cm.sup.-2] peaks )lignin skeletal aromatic and ester carbonyl vibrations respectively) of the peracetic-acid-treated samples were calculated relative to both the 899 [cm.sup.-1] peak (cellulose [beta]-1,4 linked xylopyranose backbone--anomeric carbon group frequency in cellulose and hemicellulose) and the 1370 [cm.sup.-1] peak (cellulose CH deformations).
(2006) showed that it was a type of heteropolysaccharide composed of glucose, galactose, arabinose, mannose, rhamnose, and xylopyranose.