Development of a biodegradable antibiotic delivery system.

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Infectious Disease Treatment

Background:

• Surgical site infections pose significant challenges, necessitating effective localized antibiotic delivery.
• Biodegradable antibiotic beads offer a promising approach for sustained drug release at infection sites.

Purpose of the Study:

• To develop and evaluate biodegradable antibiotic beads using a 50:50 poly(DL-lactide):co-glycolide copolymer and vancomycin.
• To assess the in vitro release kinetics and efficacy of vancomycin from these beads.

Main Methods:

• Vancomycin powder was mixed with 50:50 poly(DL-lactide):co-glycolide copolymer and hot compressed molded.
• Beads were incubated in phosphate-buffered saline at 37°C, with daily media changes.
• Vancomycin concentration was quantified using high-performance liquid chromatography (HPLC).

Main Results:

• Vancomycin concentrations remained above the breakpoint sensitivity concentration for over 32 days.
• Significant drug release occurred within the first 48 hours, with sustained release over 4–6 weeks.
• Inhibition zone diameters ranged from 6.5 mm to 10 mm, indicating effective antibiotic activity.

Conclusions:

• The developed biodegradable vancomycin beads provide sustained in vitro release suitable for treating bone infections.
• Controlling copolymer heat of formation and bead diameter allows for tunable drug release profiles.
• This method offers a flexible approach for tailoring antibiotic delivery to patient-specific needs.