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Study on Complex Formation of Biologically Active Pyridine Derivatives with Cyclodextrins by Capillary Electrophoresis by Irina V. Terekhova; Gerhard K.E. Scriba is a Chemistry article available to read on EtoBox.

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The capillary electrophoretic separation of the pyridine derivatives pyridoxine, pyridoxal, nicotinamide, nicotinic acid and isonicotinic acid in phosphate buffer using cyclodextrins as buffer additives was studied at pH 2.0 and 3.5. Superior separation was achieved at pH 2.0. Addition of alpha- and beta-cyclodextrin and the respective 2-hydroxypropyl derivatives as well as carboxymethyl-alpha-cyclodextrin to the running buffer did not significantly improve the resolution of the compounds. The interactions of alpha- and beta-cyclodextrin as well as their hydroxypropyl derivatives with the pyridine derivatives were investigated by capillary electrophoresis at pH 2.0. No complex formation was observed between the cyclodextrins and pyridoxine, pyridoxal and nicotinamide. alpha-Cyclodextrin and 2-hydroxypropyl-alpha-cyclodextrin form weak 1:1 complexes with nicotinic and isonicotinic acids in aqueous media at 298.15K, while beta-cyclodextrin and its hydroxypropyl derivative did not form complexes. The apparent stability constants (K) of the complexes calculated from the electrophoretic mobility data ranged between 3 and 33 kg/mol. The negative values of enthalpy and entropy of complex

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Author

Irina V. Terekhova; Gerhard K.E. Scriba

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0731-7085)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)