Plant mucilages. XXIII. Partial hydrolysis of Abelmoschus-mucilage M and the structural features of its polysaccharide moiety.

Abstract

Partial acid hydrolysis of Abelmoschus-mucilage M, a representative mucilage isolated from the roots of Abelmoschus manihot MEDICUS, led to the isolation of three oligosaccharides. Analysis of components, reduction and methylation, and partial degradation studies showed that these oligosaccharides are O-α-(D-galactopyranosyluronic acid)-(1→2)-L-rhamnopyranose, O-β-(D-glucopyranosyluronic acid)-(1→3)-O-α-(D-galactopyranosyluronic acid)-(1→2)-L-rhamnopyranose, and O-β-(D-glucopyranosyluronic acid)-(1→3)-O-α-(D-galactopyranosyluronic acid)-(1→2)-O-α-L-rhamnopyranosyl-(1→4)-[O-β-(D-glucopyranosyluronic acid)-(1→3)]-O-α-(D-galactopyranosyluronic acid)-(1→2)-L-rhamnopyranose. The structural features of the polysaccharide moiety in the mucilage are discussed.