Abstract
Pulsed NMR spectroscopy has been used to study Na + binding to several simple carbohydrates in aqueous solution. Changes in the 23Na spin-lattice relaxation time (T 1) were monitored to indicate complex formation between sodium ions and a ligand. It was found that Na + interacts with these hydroxy-compounds in a manner similar to other metal cations, but very weakly. Among the sugars investigated, c i s -inositol forms the strongest complexes with the stability constant about 1.2 M −1 (if 1:1 complexes are assumed). A qualitative study of competition between Na + and Ca 2+ was done, indicating that both cations have the same binding sites.
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