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Modeling dissolution of sparingly soluble multisized powders
L P de Almeida1, S Simöes, P Brito
1Laboratório de Galénica e Tecnologia Farmacéutica, Facuìdade de Farmácia, Universidade de Coimbra, Portugal.
Journal of Pharmaceutical Sciences
|June 1, 1997
Summary
This study developed a new method for modeling drug dissolution, improving predictions for sparingly soluble drugs. The new approach accurately simulates experimental dissolution profiles by considering particle size distribution.
Area of Science:
- Pharmaceutical Sciences
- Physical Chemistry
Background:
- Drug dissolution is critical, especially for sparingly soluble compounds, but current models have limitations.
- Understanding dissolution kinetics is essential for drug formulation and bioavailability.
Purpose of the Study:
- To obtain experimental dissolution profiles for ibuprofen.
- To analyze dissolution data and develop improved dissolution modeling techniques.
- To propose a new methodology accounting for powder characteristics.
Main Methods:
- Characterization of ibuprofen particle size distribution, surface area, density, solubility, and diffusion coefficient.
- Utilizing the Coulter counter technique to monitor particle number and size over time.
- Developing a new dissolution modeling approach based on experimental data and powder polydispersity.
Main Results:
- Experimental dissolution profiles for ibuprofen were successfully obtained.
- Existing dissolution model assumptions were found to be invalid under experimental conditions.
- The proposed methodology, considering particle size classes, showed high agreement with experimental data.
Conclusions:
- A novel dissolution modeling methodology was developed, outperforming traditional models.
- Accurate dissolution modeling requires considering the polydisperse nature of drug powders.
- This approach enhances the understanding and prediction of dissolution for sparingly soluble drugs.