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Poly(3-hydroxybutyrate) multifunctional composite scaffolds for tissue engineering applications.

Superb K Misra1, Tahera I Ansari, Sabeel P Valappil

  • 1Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, UK; Natural History Museum, Mineralogy, Cromwell Road, London SW75BD, UK.

Biomaterials
|January 5, 2010
PubMed
Summary

Researchers developed advanced Poly(3-hydroxybutyrate) (P(3HB)) scaffolds using sugar cubes. These bioactive glass-enhanced foams show potential for bone tissue engineering due to their biocompatibility and antibacterial properties.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Science

Background:

  • Poly(3-hydroxybutyrate) (P(3HB)) is a biodegradable polymer with potential for biomedical applications.
  • Developing advanced scaffolds with enhanced properties is crucial for effective tissue regeneration.
  • Bioactive glass (BG) incorporation can improve the bioactivity and functionality of polymer scaffolds.

Purpose of the Study:

  • To create multifunctional Poly(3-hydroxybutyrate) (P(3HB)) scaffolds for bone tissue engineering.
  • To investigate the effect of incorporating bioactive glass (BG) particles (micrometer and nanometer sizes) on scaffold properties.
  • To evaluate the bioactivity, biocompatibility, and antibacterial efficacy of the developed P(3HB)/BG composite foams.

Main Methods:

  • Utilized solvent casting and particulate leaching with sugar cubes as porogens to create highly porous P(3HB) foams.
  • Incorporated 45S5 Bioglass grade particles (micrometer and nanometer) into the P(3HB) scaffold microstructure.
  • Assessed in vitro bioactivity in simulated body fluid, protein adsorption, MG-63 osteoblast cell attachment and proliferation, in vivo biocompatibility in rats, and antibacterial activity against Staphylococcus aureus.

Main Results:

  • P(3HB) foams with 85% interconnected porosity were successfully fabricated.
  • In vitro studies confirmed the bioactivity and high protein adsorption of P(3HB)/BG foams within 10 days.
  • Foams supported MG-63 osteoblast attachment and proliferation, showed non-toxic foreign body response in vivo, and exhibited bactericidal properties.
  • Multifunctional scaffolds with bactericidal, bioactive, electrically conductive, and antioxidative properties were developed by adding Vitamin E or carbon nanotubes.

Conclusions:

  • The developed P(3HB)/BG composite foams are bioactive, biocompatible, and possess bactericidal properties, making them promising for bone tissue engineering.
  • The incorporation of bioactive glass and other functional additives (Vitamin E, carbon nanotubes) leads to multifunctional scaffolds.
  • These advanced scaffolds represent a significant step towards next-generation materials for bone tissue engineering applications.