Circular dichroism evidence is given for the involvement of carboxylate n orbitals of contiguous α-L-guluronate residues, in specific binding of Ca2+ which occurs co-operatively with the sol → gel transition for alginate.
E. R. Morris, D. A. Rees and D. Thom, J. Chem. Soc., Chem. Commun., 1973, 245 DOI: 10.1039/C39730000245
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