DSC kinetic study of the incompatibility of doxepin with dextrose
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In the present paper, the physicochemical incompatibility of doxepin with dextrose was evaluated in solid-state mixtures. The compatibility was evaluated using different physicochemical methods such as differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy and mass spectrometry. Non-isothermally stressed physical mixtures were used to study the solid-state kinetic parameters. Different thermal models such as Friedman, Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose were used for the characterization of the drug–excipient mixtures. Overall, the incompatibility of doxepin as a tertiary amine with dextrose as a reducing carbohydrate was successfully assessed. DSC-based kinetic analysis is a simple and fast method in evaluation of different drug–excipient mixtures incompatibility. Finally, it can be recommended to exclude dextrose from doxepin pharmaceutical formulations and also to apply the easy and versatile DSC method in kinetic study of drug–excipient incompatibility.
KeywordsDoxepin Dextrose Incompatibility Kinetic DSC Mass
This paper was extracted from a PhD thesis (No: 91) submitted to faculty of Pharmacy, Tabriz University of Medical Sciences and financially supported by the same University.
Compliance with ethical standards
Conflict of interest
The authors have no conflicts of interest.
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