Plant gums of the genus Khaya. Part V. Further studies on Khaya senegalensis gum

Abstract

The fractionation of deacetylated Khaya senegalensis gum has been re-examined. The main component of the gum, polysaccharide A, has been converted into the carboxy-reduced derivative, and oligosaccharides formed on acetolysis of the modified polysaccharide have been shown to include 4-O-rhamnopyranosylgalactose (I), 4-O-galactopyranosylgalactose (II), the polymer-homologous trisaccharide (III), 2-O-galactopyranosylrhamnose (IV), 4-O-(4-O-methylglucopyranosyl)galactose (V), and O-galactopyranosyl-(1 → 2)-O-rhamnopyranosyl-(1 → 4)-galactose (VI). The results confirm that this polysaccharide differs in composition but is similar in structure to polysaccharide A from K. ivorensis gum.