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Isostatic compression, a new process for incorporating vancomycin into biphasic calcium phosphate: comparison with a
H Gautier1, C Merle, J L Auget
1Laboratoire de Pharmacie Galénique, Centre de Recherche sur les Matériaux d'intérêt Biologique, UPRES EA 2159, Equipe INSERM 99-03, France. helene.gautier@sante.univ-nantes.fr
Biomaterials
|January 26, 2000
Summary
Isostatic compression offers a novel method for loading calcium-phosphate biomaterials with vancomycin, extending drug release from 3 to 7 days. This technique enhances therapeutic agent delivery compared to traditional wet granulation.
Area of Science:
- Biomaterials Science
- Pharmaceutical Technology
- Drug Delivery Systems
Background:
- Calcium-phosphate biomaterials are crucial in bone regeneration and drug delivery.
- Loading therapeutic agents like vancomycin into biomaterials requires efficient and controlled methods.
- Traditional wet granulation has limitations in achieving sustained drug release.
Purpose of the Study:
- To compare isostatic compression with wet granulation for loading vancomycin into biphasic calcium-phosphate (BCP) granules.
- To investigate the effect of isostatic compression pressure on vancomycin loading and release.
- To assess the physicochemical integrity of BCP and vancomycin after isostatic compression.
Main Methods:
- Vancomycin was associated with BCP using either adsorption or incorporation via wet granulation.
- BCP powder was subjected to isostatic compression at 100, 140, and 200 MPa.
- Compressed BCP blocks were crushed and sieved to obtain granules loaded with vancomycin.
- In vitro dissolution tests were performed to assess vancomycin release profiles.
Main Results:
- Isostatic compression maintained the structural integrity of BCP and vancomycin.
- Vancomycin release was prolonged from 3 days with wet granulation to 7 days with isostatic compression.
- Increased isostatic compression pressure led to longer vancomycin release times, likely due to reduced granule porosity.
Conclusions:
- Isostatic compression is a viable and effective method for loading vancomycin into calcium-phosphate biomaterials.
- This technique offers superior control over drug release kinetics compared to wet granulation.
- The pressure-dependent release profile suggests potential for tailored therapeutic agent delivery in bone regeneration applications.