Abstract
The potassium and sodium ion selectivities of extracellular polysaccharides in red algae were investigated by an elemental quantitative determination of Na+ and K+, the release of these ions in a dialysis experiment, viscosity and potentiometric titration. The elemental analysis indicated that all polysaccharides studied had a higher affinity toward K+ than toward Na+ in a purified and ion-exchanged state, although only carrageenan had such a tendency in a natural state without purification. The release of Na+ from the solution was faster than that of K+ for all polysaccharides studied. Among these, κ-carrageenan released Na+ most readily, in agreement with the K+ ion selectivity of this polysaccharide. The intrinsic viscosity of the potassium salt was always smaller than that of the sodium salt. Also, viscometry revealed a marked difference in the affinity of K+ toward κ- and λ-carrageenans. The potentiometric titration curve, however, showed no difference for either Na+ or K+. These results support all cases of K+ ion selectivity, especially that of κ-carrageenan. Possible mechanisms of the difference in the ion specificity among these polysaccharides are discussed.
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Akahane, T., Kawashima, S., Hirao, I. et al. Ion Selectivities of Some Extracellular Viscous Polysaccharides from Red Algae. Polym J 14, 181–188 (1982). https://doi.org/10.1295/polymj.14.181
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DOI: https://doi.org/10.1295/polymj.14.181
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