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Dry adsorbed emulsion: 2. Dissolution behaviour of an intricate formulation
O Chambin1, V Bérard, M H Rochat-Gonthier
1Groupe Technologie des Poudres à Usage Pharmaceutique, Université de Bourgogne, U.F.R. Pharmacie, 7 boulevard Jeanne d'Arc, 21 079 Cedex, Dijon, France. odile.chambin@u-bourgogne.fr
International Journal of Pharmaceutics
|March 7, 2002
Summary
Dry adsorbed emulsion (DAE) offers controlled drug release for sparingly soluble theophylline. DAE particles, acting as inert matrices, demonstrated extended release kinetics, suggesting potential for improved bioavailability in pharmaceutical formulations.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Drug Delivery Systems
Background:
- Dry adsorbed emulsion (DAE) is a pharmaceutical form designed to improve the delivery of sparingly soluble drugs.
- Understanding the dissolution and drug release kinetics of DAE is crucial for its application in pharmaceutical formulations.
- Theophylline, a sparingly soluble drug, was used as a model compound to study DAE behavior.
Purpose of the Study:
- To investigate the in vitro dissolution and drug release kinetics of a dry adsorbed emulsion (DAE) containing theophylline.
- To characterize the relationship between DAE structure and its drug release performance.
- To evaluate the influence of various experimental conditions on DAE drug release.
Main Methods:
- In vitro dissolution testing of DAE with theophylline under varying conditions (pH, surfactant presence, particle size, particle densification).
- Characterization of DAE structure and its correlation with drug release profiles.
- Analysis of dissolution data using kinetic models, such as the Higuchi model.
Main Results:
- Discrete DAE particles exhibited extended drug release compared to theophylline powder, influenced by drug solubility and particle size.
- Surfactant addition (0.1% sodium lauryl sulfate) did not significantly enhance dissolution data.
- Dissolution followed the Higuchi model after initial surface layer release, indicating matrix-controlled diffusion through the hydrophobic DAE component.
- Densified DAE particles showed slower dissolution due to reduced wettability and disintegration properties.
Conclusions:
- Dry adsorbed emulsion (DAE) functions as an inert matrix, controlling drug release primarily through diffusion.
- DAE demonstrates potential as a drug delivery system for capsules or tablets to enhance the bioavailability of sparingly soluble drugs like theophylline.
- Particle characteristics, such as densification, significantly impact the dissolution rate and drug release profile of DAE formulations.