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Characterization of O-acetyl-(4-O-methylglucurono)xylan isolated from birch and beech
STFI.ORCID iD: 0000-0002-2624-5693
VTT, Finland.
STFI.ORCID iD: 0000-0002-9892-5954
STFI.
2002 (English)In: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 337, no 4, p. 373-377Article in journal (Refereed) Published
Abstract [en]

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-GlcpA-(1 → 2)][3-O-Ac]-β-D-Xylp-(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.

Place, publisher, year, edition, pages
2002. Vol. 337, no 4, p. 373-377
Keywords [en]
hardwood, hemicellulose, extraction, xylan, structure, O-acetylation, NMR spectroscopy, MALDI-MS
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-38305DOI: 10.1016/S0008-6215(01)00327-5Scopus ID: 2-s2.0-0036177591OAI: oai:DiVA.org:ri-38305DiVA, id: diva2:1302171
Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2023-05-09Bibliographically approved

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Teleman, AnitaJacobs, Anna

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