Abstract
An acid-extractable, water-soluble, polysaccharide sulphate, isolated from Padina pavonia, comprised variable proportions of glucuronic acid, galactose, glucose, mannose, xylose, and fucose in addition to a protein moiety. Partial acid hydrolysis and autohydrolysis of the free acid polysaccharide yielded several oligosaccharides. Evidence from periodate oxidation studies indicated that the inner polysaccharide portion is composed of (1 → 4)-linked β- D-glucuronic acid, (1 → 4)-linked β- D-mannose and (1 → 4)-linked β- D-glucose residues. The heteropolymeric partially sulphated exterior portion is attached to the inner part and comprises various ratios of (1 → 4)-linked β- D-galactose, β- D-galactose-3-sulphate residues, (1 → 4)-linked β- D-glucose residues, (1 → 2)-linked α- L-fucose 4-sulphate residues and (1 → 3)-linked β- D-xylose residues.
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