Abstract
The acidic polysaccharide isolated from the gum exudate of Swietenia mahogany, and the degraded polysaccharide obtained by its mild hydrolysis with acid, are composed of residues of d-galactose, l-arabinose, l-rhamnose, and d-galacturonic acid. The products of methylation of these two polysaccharides and their carboxyl-reduced derivatives were characterized. The results of the methylation and periodate-oxidation experiments showed that these polysaccharides are extensively branched, and that their backbone is a (1 → 3)-linked d-galactan chain. The periodate consumption was in accord with the linkage distributions proposed. End-group analysis showed that the polysaccharide has a high value of average degree of polymerization.
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