alexa Abstract | Photo- and Thermal Degradation of Piroxicam in Aqueous Solution

Indian Journal of Pharmaceutical Sciences
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Research Paper Open Access


Light and temperature have considerable effect on the degradation of piroxicam in aqueous solutions. The pH and acetate buffer ions also affect the degradation process. The apparent first-order rate constants for the photochemical and thermal degradation of piroxicam have been determined as 2.04–10.01 and 0.86-3.06×10−3 min−1, respectively. The first-order plots for the degradation of piroxicam showed good linearity within a range of 20-50% loss of piroxicam at pH 2.0-12.0. The rate-pH profile for the photodegradation of piroxicam is a U-shaped curve and for the thermal degradation a bell-shaped curve in the pH range of 2.0-12.0. The thermal degradation of piroxicam was maximum around pH 6.0. It is increased in the presence of acetate ions but was not affected by citrate and phosphate ions.

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Author(s): M Aminuddin U Nazim I Ahmad


Buffer effect, kinetics, piroxicam, photodegradation, thermal degradation

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