(2-O-alpha-D-galactopyranosyl-4-O-methyl-alpha-D-glucurono)-D-xylan from Eucalyptus globulus Labill.
An unusual heteroxylan composed of galactosyl, 4-O-methyl-glucuronosyl and xylosyl residues with molar ratio 1:3:30 was isolated from the wood of Eucalyptus globulus Labill. The results of linkage analysis, supported by data of 1H, 2D 1H-1H COSY and 13C NMR spectroscopy, revealed that the polysaccharide is a (2-O-alpha-D-galactopyranosyl-4-O-methyl-alpha-D- glucurono)-D-xylan with a (1-->4)-linked beta-D-xylopyranosyl backbone branched at O-2 by short side chains composed of terminal 4-O-methyl-alpha-D-glucuronic acid and of 4-O-methyl-alpha-D-glucuronic acid substituted at O-2 with alpha-D-galactose.
Shatalov
A A
AA
Department of Chemistry, University of Aveiro, Portugal.
Evtuguin
D V
DV
Pascoal Neto
C
C
D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D014197:Trees; D014990:Xylans / Q000737:chemistry / Q000302:isolation & purification
D011134:Polysaccharides; D014990:Xylans