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Biocompatible polypeptide-based interpenetrating network (IPN) hydrogels with enhanced mechanical properties.

Shona O'Brien1, Ruairí P Brannigan, Rita Ibanez

  • 1Department of Chemistry, Royal College of Surgeons in Ireland, 123 St. Stephens Green, Dublin 2, Ireland. andreasheise@rcsi.com.

Journal of Materials Chemistry. B
|August 4, 2020
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Summary

Novel polypeptide-based interpenetrating network (IPN) hydrogels were synthesized with enhanced mechanical properties and good biocompatibility, offering potential for soft tissue scaffolds.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Hydrogels are crucial for biomedical applications due to their tissue-mimetic properties.
  • Peptide-based hydrogels offer enhanced biocompatibility but often lack mechanical strength.
  • Synthetic hydrogels can overcome limitations of natural materials.

Purpose of the Study:

  • To synthesize novel polypeptide-based interpenetrating network (IPN) hydrogels with improved mechanical properties.
  • To evaluate the mechanical strength, cell compatibility, and water diffusion characteristics of these IPN hydrogels.
  • To demonstrate the potential of these robust hydrogels as artificial tissue scaffolds.

Main Methods:

  • Synthesis of polypeptide single network via copper-catalyzed alkyne-azide cycloaddition (CuAAC).
  • Formation of IPN hydrogels through orthogonal UV-crosslinking with varying ratios of pentaerythritol tetraacrylate.
  • Characterization using mechanical testing (UCS, fracture strain, Young's modulus), cell viability assays, and 1H NMR diffusometry for water mobility.

Main Results:

  • The synthesized polypeptide-based IPN hydrogels exhibited significantly enhanced mechanical properties.
  • Mechanical strength, morphology, hydrophilicity, water diffusion, and swellability were concurrently tunable.
  • The IPN hydrogels demonstrated good biocompatibility with human Mesenchymal Stem Cells.

Conclusions:

  • Polypeptide-based IPN hydrogels represent a promising class of mechanically robust biomaterials.
  • These hydrogels offer tunable properties suitable for various biomedical applications, particularly soft tissue engineering.
  • The developed hydrogels show potential for use as advanced artificial tissue scaffolds.