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Developing dissolution testing methodologies for extended-release oral dosage forms with supersaturating properties.
Tomokazu Tajiri1, Shigeaki Morita2, Ryosaku Sakamoto3
1CTM Manufacturing, Astellas Pharma Europe B.V., Leiden 2333 BE, The Netherlands.
International Journal of Pharmaceutics
|May 30, 2015
Summary
This study developed a dissolution test for extended-release solid dispersion matrices using USP Apparatus 4. The method effectively evaluates drug release from poorly soluble formulations.
Area of Science:
- Pharmaceutical Technology
- Drug Delivery Systems
- Analytical Chemistry
Background:
- Developing in vitro dissolution tests for extended-release (ER) formulations is crucial for predicting in vivo performance.
- Lipophilic drugs in solid dispersion matrices present challenges for dissolution testing due to solubility issues.
- United States Pharmacopeia (USP) Apparatus 4 (flow-through cell) offers potential for improved dissolution testing.
Purpose of the Study:
- To develop and validate an in vitro dissolution test method with discrimination capability for an ER solid dispersion matrix of a lipophilic drug.
- To utilize USP Apparatus 4 in an open-loop configuration to assess drug release.
- To investigate the drug release mechanism and polymer behavior during dissolution.
Main Methods:
- Employing USP Apparatus 4 (flow-through cell) in an open-loop configuration.
- Maintaining sink conditions by adjusting the flow rate of the dissolution medium.
- Quantifying hydroxypropyl methylcellulose (HPMC) release using size-exclusion chromatography.
- Investigating drug release kinetics from matrices containing hydrophobic and hydrophilic polymers.
Main Results:
- The developed method demonstrated discrimination ability for the ER solid dispersion matrix.
- Sink conditions were successfully maintained by flow rate manipulation.
- Hydroxypropyl methylcellulose (HPMC) was found to maintain drug concentrations above solubility limits.
- Size-exclusion chromatography confirmed HPMC release into the dissolution medium.
Conclusions:
- USP Apparatus 4 is a suitable tool for developing in vitro dissolution methods for ER solid dispersion formulations of poorly water-soluble drugs.
- The flow-through cell apparatus allows for effective control of dissolution conditions and evaluation of drug release.
- Understanding polymer behavior, like HPMC, is important for characterizing drug release from these complex matrices.
Keywords:
Extended-release solid dispersionIn vitro dissolution testIndomethacinPoorly water-soluble drugsSink conditionSupersaturationUSP Apparatus 4 (flow-through cell)More Related Videos
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