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Solid-state stability testing of drugs by isothermal calorimetry
M J Koenigbauer1, S H Brooks, G Rullo
1ICI Pharmaceuticals Group, ICI Americas, Wilmington, Delaware 19897.
Pharmaceutical Research
|July 1, 1992
Summary
A novel isothermal calorimetry technique rapidly predicts drug degradation rates at room temperature. This method accelerates stability testing for new drug candidates, improving drug development efficiency.
Area of Science:
- Pharmaceutical Science
- Chemical Kinetics
- Materials Science
Background:
- Drug stability is crucial for efficacy and safety.
- Predicting solid-state degradation rates at room temperature is challenging.
- Current methods can be time-consuming and resource-intensive.
Purpose of the Study:
- To introduce and validate a new, rapid technique for determining solid-state room-temperature degradation rates of drugs.
- To compare the results obtained by the new technique with conventional methods.
- To assess the applicability of the technique for various drug compounds.
Main Methods:
- Utilizing isothermal calorimetry to measure initial heat output rates at elevated temperatures.
- Employing chromatography to determine degradation rates at a single elevated temperature.
- Calculating activation energies and degradation rates at 25°C using both conventional and the new method.
Main Results:
- The new isothermal calorimetry technique provides rapid calculation of degradation rates.
- Comparison with conventional methods shows good agreement for activation energies and degradation rates.
- The technique was successfully applied to a range of drug compounds, including phenytoin, triamterene, digoxin, and tetracycline.
Conclusions:
- The developed isothermal calorimetry technique offers a fast and reliable method for predicting drug degradation.
- This approach can significantly expedite the stability assessment of drug candidates.
- The technique is versatile and applicable to diverse pharmaceutical compounds.