(2-O-alpha-D-galactopyranosyl-4-O-methyl-alpha-D-glucurono)-D-xylan from Eucalyptus globulus Labill

resumo

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 H-1, 2D H-1-H-1 COSY and C-13 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. (C) 1999 Elsevier Science Ltd. All rights reserved.

palavras-chave

METHYLATION ANALYSIS; POLYSACCHARIDES; ACID; PURIFICATION; SPECTROSCOPY; HETEROXYLAN; CELLULOSE; CELLS; FIBER; BRAN

categoria

Biochemistry & Molecular Biology; Chemistry

autores

Shatalov, AA; Evtuguin, DV; Neto, CP

nossos autores

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