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DOI: 10.1039/A807916A (Paper) Reference Section for: Phys. Chem. Chem. Phys., 1999, 1, 441-444

Investigation of buffer-cyclodextrin systems

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Zhengping Yi, Changchun Zhao, Zhengzi Huang, Huilan Chen and Junsheng Yu

Abstract

Equilibrium constants for the formation of inclusion compounds of 3-hydroxy-2-naphthoic acid with β-cyclodextrin were determined in aqueous solutions, in the absence and presence of buffers, by the steady-state fluorescence Benesi–Hildebrand method. Almost all the buffers that are usually used have been tested and they are found to have an influence on the formation constants. We suggest that buffers should not be used in aqueous solutions of cyclodextrins unless the experimental error is unacceptable. Furthermore, we obtained the inclusion compound formation constants (Ksalt) of β-CD with some buffer components by using a fluorescence competitive inhibition technique. NaClO4, KClO4, KCl, KHC8H4O4, KH2C6H5O7 and NaHC4H4O6 can form 1:1 inclusion complexes with β-cyclodextrin (Ksalt>0) while KF, K2SO4, NaH2PO4, NaAc, Na2HPO4 and NaHCO3 cannot (Ksalt<0).

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