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Related Experiment Videos

Biodegradable polyhydroxyalkanoate implants for osteomyelitis therapy: in vitro antibiotic release.

F Türesin1, I Gürsel, V Hasirci

  • 1Health Sciences Centre, Gastrointestinal Sciences, Calgary, AB, Canada.

Journal of Biomaterials Science. Polymer Edition
|June 14, 2001
PubMed
Summary

Biodegradable polymer rods deliver antibiotics for osteomyelitis. Coating enhances sustained drug release over two weeks, unlike uncoated rods which release faster.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Polymer Chemistry

Background:

  • Chronic osteomyelitis requires effective local antibiotic delivery.
  • Biodegradable polymers offer potential for controlled drug release implants.
  • Polyhydroxyalkanoates (PHAs) are a class of biodegradable polyesters.

Purpose of the Study:

  • To develop and evaluate biodegradable implantable rods for local antibiotic delivery in osteomyelitis.
  • To investigate the influence of polymer type, drug loading, and surface coating on antibiotic release kinetics.
  • To compare the release profiles of Sulperazone and Duocid from poly(3-hydroxybutyrate-co-4-hydroxybutyrate) rods.

Main Methods:

  • Fabrication of biodegradable rods using random copolyesters: poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-4HB)).

Related Experiment Videos

  • Loading of antibiotics (Sulperazone and Duocid) into the polymer matrix.
  • In vitro drug release studies under varying conditions (drug loading, uncoated vs. coated rods).
  • Surface topography analysis of drug-loaded rods.

    • Main Results:

    • Drug loading, antibiotic type, and rod coating significantly affected in vitro release profiles.
    • Sulperazone release rate from P(3HB-4HB) rods was controlled by polymer/drug ratio, primarily driven by drug dissolution.
    • Coating rods reduced initial burst effect and sustained Sulperazone release for over two weeks with near zero-order kinetics.
    • Duocid release from hydrophobic rods was faster than Sulperazone, and zero-order release was not achieved.

    Conclusions:

    • Biodegradable P(3HB-4HB) rods are effective for controlled local antibiotic delivery.
    • Surface coating is a viable strategy to achieve sustained, zero-order antibiotic release, crucial for chronic osteomyelitis treatment.
    • The choice of antibiotic and polymer matrix significantly influences drug release characteristics.