Characterization of O-acetyl-(4-O-methylglucurono)xylan isolated from birch and beech

Anita Teleman (Corresponding Author), Maija Tenkanen, Anna Jacobs, Olof Dahlman

Research output: Contribution to journalArticleScientificpeer-review

181 Citations (Scopus)

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-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.
Original languageEnglish
Pages (from-to)373-377
JournalCarbohydrate Research
Volume337
Issue number4
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Keywords

  • hardwood
  • hemicellulose
  • extraction
  • xylan
  • structure
  • O-acetylation
  • 1H and 13C NMR spectroscopy
  • MALDI-MS

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