Abstract
The photostability of ciprofloxacin in the presence and absence of α-, β-, γ-cyclodextrins (CDs) has been investigated in aqueous solutions by UV-visible spectroscopy. The results show that a linear relationship between irradiation time and the absorbance of the drug after irradiation proved that the degradation reaction is first-order. In addition, the half-life of the degradation process is evidence that the process is first-order kinetics with respect to the drug, and independent of cyclodextrin concentrations. The complexation of the drug with α-cyclodextrin causes an increase in the photostability of the drug, but with β-and γ-cyclodextrins have no effect. In this study, the characterization of the inclusion complexes has been proved by differential scanning calorimetry and 1H NMR