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Optimizing Electroconductive PPy-PCL Scaffolds for Enhanced Tissue Engineering Performance.

Ana M Muñoz-González1, Dianney Clavijo-Grimaldo2,3, Sara Leal-Marin4,5

  • 1Faculty of Engineering, Universidad Nacional de Colombia, Bogotá, Colombia.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|November 22, 2024
PubMed
Summary

Researchers developed conductive polypyrrole-polycaprolactone (PPy-PCL) scaffolds for tissue regeneration. Optimized fabrication enhanced conductivity, mechanical strength, and hydrophilicity, supporting cell growth without toxicity.

Keywords:
electrically conductiveelectrospinningpolycaprolactonepolypyrrolescaffolds

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Electrically conductive materials show promise for enhancing tissue regeneration.
  • Developing functional scaffolds requires optimizing material properties and fabrication processes.

Purpose of the Study:

  • To create and optimize electroconductive polypyrrole-polycaprolactone (PPy-PCL) scaffolds for tissue engineering applications.
  • To investigate the effect of processing parameters on scaffold conductivity, morphology, mechanical properties, and biocompatibility.

Main Methods:

  • Utilized Box-Behnken response surface methodology for in situ chemical polymerization of polypyrrole (PPy) within a polycaprolactone (PCL) matrix.
  • Characterized scaffold composition and morphology using Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-ray (EDX), and Scanning Electron Microscopy (SEM).
  • Assessed mechanical properties (tensile strength, Young's modulus), hydrophilicity, and cell viability (MTT and Alamar Blue assays with L929 fibroblasts and bone marrow mesenchymal stem cells).

Main Results:

  • Achieved a maximum conductivity of 2.542 mS/cm in the optimized PPy-PCL scaffolds.
  • SEM revealed uniform PPy dispersion within PCL fibers.
  • Optimized scaffolds demonstrated superior tensile strength and Young's modulus compared to pure PCL, alongside improved hydrophilicity.
  • Cell viability assays showed no cytotoxicity and increased metabolic activity, indicating support for cellular functions.

Conclusions:

  • In situ synthesis of PPy in a PCL matrix, optimized via fabrication parameters, yields conductive scaffolds with enhanced structural and functional properties.
  • These PPy-PCL scaffolds are suitable for tissue engineering applications due to their improved conductivity, mechanical integrity, hydrophilicity, and biocompatibility.