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Influence of complex solubility on formulations based on lambda carrageenan and basic drugs.
Carola Aguzzi1, Maria Cristina Bonferoni, Maria Rosario Osorio Fortich
1Department of Pharmaceutical Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
AAPS Pharmscitech
|August 15, 2003
Summary
Drug solubility in carrageenan complexes impacts controlled release. More soluble complexes showed gelation and altered drug release kinetics, indicating suitability for controlled drug delivery.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
Background:
- Carrageenan complexes are utilized in controlled release formulations.
- Drug solubility is a key factor influencing complex behavior.
Purpose of the Study:
- To compare the controlled release behavior of drug/carrageenan complexes with varying water solubilities.
- To investigate the relationship between complex solubility, hydration, gelation, and drug release profiles.
Main Methods:
- Characterization of drug/carrageenan complexes using solubility, water uptake, and release tests.
- Evaluation of gelation behavior upon hydration.
- Analysis of drug release kinetics over 10-12 hours.
Main Results:
- Significant differences in hydration and gelation behavior were observed based on drug solubility (metoprolol, tramadol, diltiazem, bupropion).
- Drug release profiles varied, correlating with complex solubility and hydration properties.
- All complexes demonstrated potential for controlled release applications.
Conclusions:
- Drug/carrageenan complex solubility is a critical determinant of hydration, gelation, and drug release kinetics.
- Understanding these properties is essential for designing effective controlled release formulations.
- Carrageenan complexes offer versatile platforms for tailoring drug release profiles.