Abstract
The mucilage isolated from Opuntia aurantiaca has been shown by methylation and partial hydrolysis studies to possess a highly branched structure. The mucilage is composed of 4-linked galactosyluronic acid, 2-linked rhamnosyl, and 6-linked galactosyl residues. Most of the last-named residues carry branches at C-3 or C-4, or both C-3 and C-4. The branches are composed mainly of (1→3)-linked, (1→5)-linked, and end-group arabinofuranosyl residues, and end-group xylopyranosyl residues. The mucilage possesses both acid-stable and acid-labile galactosyluronic acid residues. The ratio of galacturonic to rhamnose in the degraded polysaccharide is 1:2.
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