Abstract

Abstract Equilibria involved in the Schiff base formations of pyridoxal 5′-phosphate (PLP) and 5′-deoxypyridoxal with mono-, di-, and peraminocyclodextrins have been studied to determine equilibrium binding constants in aqueous media at several pH values. These results, as well as the circular dichroism study, show that remote electrostatic interactions between the negatively charged 5′-phosphate group and a second ammonium group on the cyclodextrins play a significant role in the complexation.

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