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Hydrogel-based magnetoelectric microenvironments for tissue stimulation.

B Hermenegildo1, C Ribeiro2, L Pérez-Álvarez3

  • 1Centro/Departamento de Física, Universidade do Minho, 4710-057 Braga, Portugal; BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain.

Colloids and Surfaces. B, Biointerfaces
|August 7, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnetoelectric hydrogel scaffold for bone tissue engineering. The scaffold, made from cobalt ferrite (CoFe2O4), methacrylated gellan gum (GGMA), and polyvinylidene fluoride (PVDF), offers controlled tissue regeneration via magnetic field stimulation.

Keywords:
HydrogelMagnetoelectricPoly(vinylidene fluoride)SpheresTissue engineering

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Nanotechnology

Background:

  • Mimicking natural tissue environments with engineered scaffolds is a key challenge in tissue engineering.
  • Hydrogels are promising scaffold materials due to their high water content, biocompatibility, and ability to incorporate functional nanomaterials.
  • Magnetically responsive and magnetoelectric materials offer unique advantages for bone tissue engineering, enabling stimuli-responsive regeneration and external control.

Purpose of the Study:

  • To develop a novel hydrogel-based scaffold incorporating magnetoelectric CoFe2O4/PVDF nanoparticles within a GGMA matrix.
  • To evaluate the scaffold's potential for bone tissue engineering applications by assessing its mechanical, magnetic, piezoelectric, and magnetoelectric properties.
  • To demonstrate the ability to trigger dynamic mechanical and electrical responses using an external magnetic field for controlled tissue regeneration.

Main Methods:

  • Fabrication of a CoFe2O4/Methacrylated Gellan Gum (GGMA)/poly(vinylidene fluoride) (PVDF) hydrogel scaffold.
  • Characterization of the scaffold's mechanical properties (Young's modulus), cell viability, magnetic properties (magnetization saturation, coercivity), and piezoelectric/magnetoelectric responses.
  • Incorporation of PVDF/CoFe2O4 spheres (2 wt.%) into the GGMA hydrogel, with specific filler content (20 wt.%) for optimal properties.

Main Results:

  • The developed CoFe2O4/GGMA/PVDF scaffold exhibits a Young's modulus of 20 kPa and cell viability exceeding 80%.
  • The incorporated PVDF/CoFe2O4 spheres show significant magnetization saturation (20 emu/g) and coercivity (2.7 kOe), with a β-phase content of approximately 78%.
  • The scaffold demonstrates a notable piezoelectric response (|d33| ≈ 22 pC/N) and a magnetoelectric response (Δ|d33| ≈ 6 pC/N) upon application of a DC magnetic field.

Conclusions:

  • The CoFe2O4/GGMA/PVDF hydrogel scaffold possesses a porous 3D structure, biocompatibility, and bioresorbability, making it suitable for tissue engineering.
  • The scaffold's unique combination of mechanical/electrical dynamic responses, triggerable by an external magnetic field, opens new avenues for bone tissue regeneration strategies.
  • This magnetoelectric scaffold offers a promising platform for developing advanced, externally controllable therapeutic devices for regenerative medicine.