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Controlled release of antibiotics from biomedical polyurethanes: morphological and structural features
J M Schierholz1, H Steinhauser, A F Rump
1Institute of Medical Microbiology and Hygiene, University of Cologne, Germany.
Biomaterials
|June 1, 1997
Summary
Incorporating antibiotics like ciprofloxacin and gentamicin into polyurethane materials effectively inhibits bacterial colonization. Homogeneous polymer-antibiotic combinations are crucial for sustained drug release and long-term antimicrobial activity.
Area of Science:
- Biomaterials Science
- Infectious Diseases
- Polymer Chemistry
Background:
- Polymer-associated infections pose a significant and growing clinical challenge.
- Effective antimicrobial delivery systems are needed to combat these infections.
Purpose of the Study:
- To evaluate the antimicrobial properties of polyurethane materials loaded with various antistaphylococcal drugs.
- To understand the relationship between drug release, bacterial colonization, and material morphology.
Main Methods:
- Solvent casting technique used to incorporate ciprofloxacin, gentamicin, fosfomycin, and flucloxacillin into polyurethanes.
- Drug release rates assessed via bioassay and high-performance liquid chromatography (HPLC).
- Bacterial colonization and material morphology examined using scanning electron microscopy (SEM).
Main Results:
- Ciprofloxacin exhibited rapid initial drug release; gentamicin showed a more continuous release pattern.
- Sustained antimicrobial delivery from homogeneous polymer-antibiotic combinations effectively inhibited bacterial colonization.
- SEM revealed homogeneous distribution for gentamicin and flucloxacillin, while ciprofloxacin and fosfomycin showed granular structures.
Conclusions:
- Physicochemical similarity between polymers and antibiotics enhances combination homogeneity.
- High homogeneity is essential for sustained drug release and effective inhibition of bacterial colonization in polymer-based delivery systems.