Abstract
Aeodes ulvoidea, a red seaweed of the Grateloupiaceae, yielded a highly sulphated polysaccharide which was shown to contain d-galactose, 4- O-methyl-L-galactose, and 2- O-methyl- d-galactose, together with chromatographic traces of 6- O-methylgalactose, xylose, and mannose. The sulphate was not labile to alkali, but it was largely removed with methanolic hydrogen chloride. Periodate oxidation of the polysaccharide and methylation of the desulphated polymer indicate ( a) the presence of (1→3)- and (1→4)-glycosidic links in the macromolecule, ( b) that the 2- O-methyl- d-galactose is either (1→4)= and/or (1→3)-linked, and ( c) that the 4- O-methyl-L-galactose is probably present only as non-reducing end-group.
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