Abstract
Anionic polysaccharide (PS) was extracted from Aphanothece stagnina biomaterials where trivalent metal ions were remarkably condensed from environmental water. Structural analyses indicated that the PS was considered to be a kind of sulfated rhamnoglucan-containing uronic acid at a composition of 23 mol% and that the total composition of anionic groups such as sulfate and carboxylate was 31 mol% to the monosaccharide residues. Since the PS was found to be a huge macromolecule with an ultra-high molecular weight (3.14 × 107 g/mol), the simple calculation indicated that about 9.5 × 104 anions exist on one chain of the PS. The electric conductivity of the highly anionic PS solutions indicated that the metal ions such as Ga3+, La3+, and Ca2+ complexed ionically with PS chains. The PS formed the gels as a result of trivalent metal complexation, but the gelation behavior of the PS was different from that of the representative metal-complexable polysaccharide, alginate, in terms of the minimum gel formation concentration and the average molecular weight between cross-linking points.
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We appreciate Dr. Osaka who is a technician in JAIST for the measurement of FT-ICR-MS and for his precious advice.
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M. Okajima contributed equally to 1st author.
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le Nguyen, Q.T., Okajima, M., Mitsumata, T. et al. Trivalent metal-mediated gelation of novel supergiant sulfated polysaccharides extracted from Aphanothece stagnina . Colloid Polym Sci 290, 163–172 (2012). https://doi.org/10.1007/s00396-011-2528-3
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DOI: https://doi.org/10.1007/s00396-011-2528-3