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A. K. Sen Sr., A. K. Das, K. K. Sarkar, A. K. Siddhanta, R. Takano, K. Kamei, S. Hara

An Agaroid-Carrageenan Hybrid Type Backbone Structure for the Antithrombotic Sulfated Polysaccharide from Grateloupia indica Boergensen (Halymeniales, Rhodophyta)

The water-soluble antithrombotic polysaccharide sulfate fraction designated GI-1 was isolated from the marine red alga Grateloupia indica. It consists mainly of D-galactose (Gal), L-Gal, 3,6-anhydro-D-galactose (D-AnGal) and 3,6-anhydro L-galactose (L-AnGal). On the basis of the results from ¹³C NMR and methylation analysis of completely desulfated GI-1, we assigned a typical agarocolloid-carrageenan hybrid type of the backbone consisting of both disaccharide repeating units, [?3)?-D-Gal(1?4)?-D-Gal(1?] and [?3)?-D-Gal(1?4)?-LGal( 1?]. In addition, two repeating units, [?3)?-D-Gal(1?4)?-D-AnGal(1?] and [?3)?-D-Gal(1?4)?-L-AnGal(1?], were also suggested for the native GI-1 from partial methanolysis and ¹³C NMR studies.

Botanica Marina, Walter de Gruyter

Print ISSN: 0006-8055
Volume: 45, 07/2002
Pages: 331 - 338

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