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Development of a dialysis in vitro release method for biodegradable microspheres
Susan S D'Souza1, Patrick P DeLuca
1University of Kentucky College of Pharmacy, Lexington, KY 40536, USA.
AAPS Pharmscitech
|December 16, 2005
Summary
A novel dialysis method using a Float-a-Lyzer offers a simple in vitro release test for biodegradable microspheres. This method accurately assesses peptide diffusion and drug release from Leuprolide PLGA microspheres.
Area of Science:
- Pharmaceutical Sciences
- Biomaterials Science
- Drug Delivery Systems
Background:
- Biodegradable microspheres are advanced drug delivery systems.
- Developing a simple and reliable in vitro release method is crucial for quality control and formulation development.
- Existing methods like sample and separate can be time-consuming and may not accurately reflect in vivo conditions.
Purpose of the Study:
- To develop and validate a convenient in vitro release method for biodegradable microspheres using a commercial dialyzer.
- To evaluate peptide diffusion across a dialysis membrane under various conditions.
- To compare the performance of the dialysis method with the traditional sample and separate method for Leuprolide PLGA microspheres.
Main Methods:
- Utilized a 25 KD MWCO Float-a-Lyzer for in vitro release studies.
- Investigated peptide diffusion at 37°C and 55°C in different buffers and peptide concentrations.
- Assessed in vitro release of Leuprolide from PLGA microspheres using the dialyzer and compared it to the sample and separate method.
Main Results:
- Peptide diffusion through the dialysis membrane was rapid and independent of peptide concentration at both tested temperatures.
- No significant peptide binding to the dialysis membrane was observed.
- The dialysis technique demonstrated a tri-phasic release of Leuprolide from PLGA microspheres, completing in 28 days.
- The sample and separate method yielded linear release profiles, with complete release achieved under agitation.
Conclusions:
- The Float-a-Lyzer is suitable for developing an in vitro release system for microparticulate dosage forms due to rapid diffusion.
- The dialysis method provides a reliable and convenient approach for studying drug release from microspheres under various conditions.
- This method can be applied to study drug release under both real-time and accelerated conditions, aiding formulation development and quality control.
