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Sources of variation during collaborative evaluation of in vitro dissolution tests for two solid preparations.
The Journal of Pharmacy and Pharmacology
|July 1, 1979
Summary
Collaborative dissolution testing revealed product release differences, especially in disintegration. Variance patterns differed, with tolbutamide tablets showing more inter-laboratory variation and oxytetracycline capsules showing more within-laboratory error.
Area of Science:
- Pharmaceutical Sciences
- Analytical Chemistry
Background:
- In vitro dissolution testing is crucial for pharmaceutical quality control.
- Variability in dissolution results can impact drug product performance assessment.
Purpose of the Study:
- To assess inter-laboratory variability in dissolution testing for commercial drug products.
- To identify sources of variation in dissolution testing for tolbutamide tablets and oxytetracycline capsules.
Main Methods:
- Eight laboratories conducted collaborative in vitro dissolution tests on tolbutamide tablets and oxytetracycline capsules.
- Analysis focused on release characteristics, disintegration, and variance patterns.
Main Results:
- Significant differences in release characteristics, particularly disintegration, were observed between the two drug products.
- Tolbutamide tablets exhibited greater inter-laboratory variance, while oxytetracycline capsules showed higher within-laboratory variance.
- Identified sources of inter-laboratory variation included vibration levels and inconsistent use of extinction coefficients.
Conclusions:
- Dissolution testing variability is influenced by both product-specific factors and laboratory procedures.
- Optimizing dissolution testing protocols, including controlling environmental factors and standardizing analytical methods, is essential for reliable drug product evaluation.