Cefazolin-loaded mesoporous silicon microparticles show sustained bactericidal effect against Staphylococcus aureus

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Infectious Disease Research

Background:

• Cefazolin is a common antibiotic for surgical prophylaxis and post-operative infections.
• Systemic cefazolin delivery can lead to resistance and toxicity.
• Local, controlled release offers potential benefits like reduced dosage and minimized side effects.

Purpose of the Study:

• To develop and evaluate a mesoporous silicon microparticle system for sustained cefazolin release.
• To assess the in vitro release kinetics, antibacterial efficacy, and cytotoxicity of the system.
• To demonstrate the potential of this system for orthopedic surgery and tissue engineering.

Main Methods:

• Mesoporous silicon microparticles with varying nanopore sizes were fabricated.
• Cefazolin loading and in vitro release kinetics were studied.
• Antibacterial activity against Staphylococcus aureus (MIC 250 µg/mL) and cytotoxicity in mesenchymal stem cells were evaluated.
• Zone of inhibition assays and suspension culture tests were performed.

Main Results:

• Mesoporous silicon microparticles demonstrated efficient cefazolin loading and continuous release over several days.
• Medium pore size particles showed sustained bactericidal properties.
• The system exhibited minimal toxicity to mesenchymal stem cells over a 7-day period.
• Effective bacterial killing in suspension cultures within 24 hours was observed.

Conclusions:

• Sustained cefazolin release from mesoporous silicon microparticles provides effective, long-term bacterial growth control.
• This delivery system minimizes cefazolin toxicity to surrounding cells.
• Mesoporous silicon microparticles enhance drug bioavailability and stability for tissue engineering applications.