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A fractionation study of crude agar from the red seaweed  Digenea simplex  led to isolation of a galactan sulfate fraction consisting of a carrageenan-agaroid hybrid-type backbone. This polysaccharide fraction, containing D-galactose (Gal), L-Gal, 3,6-anhydro-D-galactose (D-AnGal), L-AnGal, sulfate and a small amount of xylose, appeared to consist of repeating units of both 4- O -β-D-galactopyranosyl-3,6-anhydro-L-galactose (agarobiose) and 4- O -β-D-galactopyranosyl-3,6-anhydro-D-galactose (carrabiose) on the basis of results from a partial methanolysis study. Two other repeating disaccharide units in the backbone, 4- O -β-D-galactopyranosyl- L-galactose and 4- O -β-D-galactopyranosyl-D-galactose, were also suggested by the methylation study. The sulfate groups were also suggested to be located at O-4 of (1→3)-linked D-Gal, O-6 of (1→3)-linked D-Gal, O-6 of (1→4)-linked L-Gal and/or O-2 of (1→4)-linked AnGal residues, besides O-3 of (1→4)-linked D-Gal residue. Co-occurrence of carrageenan and agarocolloid backbone structure among the genera in the Florideophycidae was also reviewed.

botanica marina

Occurrence of Carrageenan Structure in an Agar from the Red Seaweed Digenea simplex (Wulfen) C. Agardh (Rhodomelaceae, Ceramiales) with a Short Review of Carrageenan-Agarocolloid Hybrid in the Florideophycidae