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Local pharmaceutical release from a new hydrogel implant
Peter B Petratos1, Jie Chen, Diane Felsen
1Center for Pediatric Urology and Laboratory for Minimal Invasive Urologic Surgery, Weill Medical College of Cornell University, New York, New York 10021, USA.
The Journal of Surgical Research
|February 22, 2002
Summary
This study shows that cross-linked matrix (CLM) hydrogels offer controlled drug release, with release rates dependent on molecular weight and concentration. The CLM maintains antibiotic activity, demonstrating potential for localized biologic delivery.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Drug Delivery Systems
Background:
- Solid hydrogel polymers serve as reservoirs for controlled pharmaceutical release.
- Cross-linked matrix (CLM) hydrogels are permanent implants that release drugs via diffusion.
- These biocompatible CLMs polymerize in situ, mechanically bonding to implant sites and offering tissue sealing capabilities.
Purpose of the Study:
- To quantify the release kinetics of a specific hydrogel polymer system.
- To evaluate the diffusion-based release mechanism of dyes and antibiotics from CLMs.
- To assess the retention of antibiotic activity after release from the CLM.
Main Methods:
- Prepared CLMs with varying prepolymer concentrations (6% and 20%).
- Quantified dye release using spectrophotometry over 168 hours.
- Assessed tetracycline release and its antibacterial efficacy against Escherichia coli via agar diffusion assays.
Main Results:
- Dye and antibiotic release rates were inversely proportional to molecular weight, consistent with diffusion.
- Higher molecular weight compounds exhibited slower release kinetics.
- Released antibiotics demonstrated potent inhibition of E. coli growth, confirming retained biologic activity.
Conclusions:
- Pharmaceutical release from CLMs is controllable by adjusting pharmaceutical concentration.
- Polymerization and release processes do not degrade the biologic activity of antibiotics.
- CLMs represent a versatile class of biocompatible polymers for localized delivery of biologics with predictable release kinetics.