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- W1968654416 abstract "Recent advances in the understanding of the effects of various cations on the disorder—order transitions of the charged carrageenans (iota- and kappa-carrageenan and furcellaran) are reviewed, with special emphasis on the occurrence and origin of cation specificity. Analysis within a general electrostatic model, the Poisson—Boltzmann cell model, shows that, for charged polysaccharides, the stabilizing effect of divalent ions on the ordered conformation is expected from non-specific electrostatic interactions alone. On the other hand, if the ordered conformation contains a site which may specifically bind certain cations (as for kappa-carrageenan), even a weak intrinsic binding constant may have large consequences for its stability in the presence of binding ions. The ordered conformation of furcellaran contains sites very similar to those in kappa-carrageenan, which specifically bind certain monovalent cations. Iota-carrageenan, on the other hand, contains no ion-binding sites, but is influenced only by non-specific electrostatic interactions. Ion-specific effects seen in conventionally prepared iota-carrageenan samples are due to small impurities of kappa-carrageenan structure. The nature of the binding site in kappa-carrageenan and furcellaran is unclear. It is concluded that it contains more than one functional group in the carrageenan helix, but not necessarily the sulfate group." @default.
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- W1968654416 date "1991-05-01" @default.
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- W1968654416 title "Effects of ions on the disorder—order transitions of gel-forming polysaccharides" @default.
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- W1968654416 doi "https://doi.org/10.1016/s0268-005x(09)80288-9" @default.
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