Abstract
The structures of water-soluble birch and beech xylans, extracted from holocellulose using dimethyl sulfoxide, were determined employing 1H and 13C NMR spectroscopy together with chemical analysis. These polysaccharides were found to be O-acetyl-(4- O-methylglucurono)xylans containing one 4- O-methylglucuronic acid substituent for approximately every 15 d-xylose residues. The average degree of acetylation of the xylose residues in these polymers was 0.4. The presence of the structural element →4)[4- O-Me-α- d-Glc pA-(1→2)][3- O-Ac]-β- d-Xyl p-(1→ was demonstrated. Additional acetyl groups were present as substituents at C-2 and/or C-3 of the xylopyranosyl residues. Utilizing size-exclusion chromatography in combination with mass spectroscopy, the weight-average molar masses (and polydispersities) were shown to be 8000 (1.09) and 11,100 (1.08) for birch and beech xylan, respectively.
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