Abstract
The technique of solution calorimetry has been employed to study the interaction between diclofenac sodium and beta-cyclodextrin by determining the enthalpies of solution of the drug in water and in aqueous beta-cyclodextrin solution. Thermodynamic parameters characterizing the binding process such as enthalpy deltaH0, equilibrium constant K, free energy deltaG0 and entropy deltaS0 have been calculated to be 12.00 kJ mol(-1), 1670 dm3 mol(-1), -19.03kJ mol(-1) and 22.98 J K(-1) mol(-1), respectively. Enthalpies of solution of diclofenac sodium have also been determined in water-ethanol mixtures.
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