Structural studies of an acidic polysaccharide from the mucin secreted by Drosera capensis

✍ Scribed by D.Channe Gowda; Gerd Reuter; Roland Schauer

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 988 KB
• Volume: 113
• Category: Article
• ISSN: 0008-6215
• DOI: 10.1016/0008-6215(83)88223-8

✦ Synopsis

The polysaccharide of the mucin secreted by the leaves of Drosera capensis is composed of L-arabinose, D-xylose, D-galactose, D-mannose, and D-glucuronic acid in the molar ratio of 3.6 : 1 .O : 4.9 : 8.4 : 8.2. For structural elucidation, methylation analysis using g.1.c. and g.l.c.-m.s. was performed on the native, the carboxyl-reduced, and the degraded polysaccharides.

Partial hydrolysis, periodate oxidation, chromium trioxide oxidation, and uranic acid degradation were also performed on the native and carboxyl-reduced polysaccharides. Partial hydrolysis of the native and carboxylreduced polysaccharides gave various oligosaccharides that were characterized and suggest a structure containing a D-glucurono-D-mannan backbone having a repeating unit -t4)-fi-D-GlcpA-(1 +2)-cr-D-Manp-(1 +. L-Arabinose and D-xylose are present as nonreducing furanosyl and pyranosyl end-groups, respectively, both attached to O-3 of D-glucuronic acid residues of the backbone. D-Galactose is present as nonreducing pyranosyl end-group linked to O-3 of D-mannose residues.