抄録
Cyanobacterial polysaccharides, sacrans, are anionic megamolecules having extremely high molecular weights (Mw: 1.6 x 107). We confirmed by FT-MS analyses that sacran is composed of various partial structures such as continuous and combination structures of uronic acids and hexoses. We used highly swollen sacran gels (swelling degree: 700-800 times of dry weight) prepared by chemical cross-linking with diamines such as l-lysine. Sacran gels shrank and clouded in aqueous solutions of In and Gd ions and showed more than 100 times adsorption ratios of these metal ions compared with non cross-linked sacran presumably due to continuous uronic acids.
