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Pullulan-based composite scaffolds for bone tissue engineering: Improved osteoconductivity by pore wall

Amrita1, Aditya Arora1, Poonam Sharma1

  • 1Department of Biological Sciences and Bioengineering, Indian Institute of Technology-Kanpur, Kanpur, 208016, India.

Carbohydrate Polymers
|April 7, 2015
PubMed
Summary

Researchers improved pullulan hydrogels for bone tissue engineering by adding nano-crystalline hydroxyapatite (nHAp) and poly(3-hydroxybutyrate) (PHB) fibers. Mineralization enhanced mechanical properties and osteoconductivity for potential bone graft applications.

Keywords:
Bone tissue engineeringCompositeHydrogelHydroxyapatitePore surface mineralizationPullulan

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Materials Science

Background:

  • Porous hydrogels are investigated for bone tissue engineering but often exhibit inadequate mechanical strength for bone graft substitutes.
  • Incorporating fillers is a common strategy to enhance hydrogel mechanical properties.

Purpose of the Study:

  • To reinforce pullulan hydrogels with nano-crystalline hydroxyapatite (nHAp) and poly(3-hydroxybutyrate) (PHB) fibers.
  • To improve the mechanical properties and cellular compatibility of pullulan-based hydrogels for bone tissue engineering.
  • To develop osteoconductive scaffolds via surface mineralization.

Main Methods:

  • Pullulan hydrogels were reinforced with 5 wt% nHAp and 3 wt% PHB fibers containing 3 wt% nHAp.
  • A double diffusion method was employed to deposit hydroxyapatite onto the pore walls of the composite scaffolds.
  • Scaffolds were characterized for mechanical properties and in vitro osteoconductivity.

Main Results:

  • Reinforcement with nHAp and PHB fibers increased the compressive modulus of the pullulan hydrogel by tenfold.
  • The double diffusion method successfully coated the porous scaffolds with hydroxyapatite, improving uniformity.
  • Mineralized scaffolds exhibited enhanced osteoconductivity in vitro and further improved compressive modulus.

Conclusions:

  • Mineralized pullulan-based composite scaffolds show promise for non-load-bearing bone tissue engineering applications.
  • The developed composite scaffolds offer improved mechanical strength and osteoconductivity compared to plain hydrogels.
  • Surface modification via mineralization is an effective strategy to enhance the performance of hydrogel scaffolds for bone regeneration.