Characterization of an acetylated heteroxylan from Eucalyptus globulus Labill
authors Evtuguin, DV; Tomas, JL; Silva, AMS; Neto, CP
nationality International
journal CARBOHYDRATE RESEARCH
author keywords xylan; acetyl groups; Eucalyptus globulus; structural analysis; NMR spectroscopy
keywords C-13 NMR-SPECTROSCOPY; POLYSACCHARIDES; XYLAN; KRAFT; FIBER; H-1
abstract A heteroxylan was isolated from Eucalyptus globulus wood by extraction of peracetic acid delignified holocellulose with dimethyl sulfoxide. Besides (1 --> 4)-linked beta-D-xylopyranosyl units of the backbone and short side chains of terminal (1 --> 2)-linked 4-O-methyl-alpha-D-glucuronosyl residues (MeGlcA) in a 1:10 molar ratio, this hemicellulose contained galactosyl and glucosyl units attached at O-2 of MeGlcA originating from rhamnoarabinogalactan and glucan backbones, respectively. About 30% of MeGlcA units were branched at O-2. The O-acetyl-(4-O-methylglucurono)xylan showed an acetylation degree of 0.61, as determined by H-1 NMR spectroscopy, and a weight-average molecular weight (M-w) of about 36 kDa (P = 1.05) as revealed from size-exclusion chromatography (SEC) analysis. About half of the beta-D-xylopyranosyl units of the backbone were found as acetylated moieties at O-3 (34 mol%), O-2 (15 mol%) or O-2,3 (6 mol%). Practically, all beta-D-xylopyranosyl units linked at O-2 with MeGlcA residues were 3-O-acetylated (10 mol%). (C) 2003 Elsevier Science Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0008-6215
year published 2003
volume 338
issue 7
beginning page 597
ending page 604
digital object identifier (doi) 10.1016/S0008-6215(02)00529-3
web of science category Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic
subject category Biochemistry & Molecular Biology; Chemistry
unique article identifier WOS:000181952300003
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journal impact factor 1.841
5 year journal impact factor 1.973
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