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Researchers developed advanced injectable hydrogels using fiber reinforcement for enhanced strength and rapid gelation. These new materials show excellent cell compatibility, paving the way for improved minimally invasive applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Injectable hydrogels face limitations in gelation speed, mechanical strength, and cytocompatibility.
  • Polymeric self-assembly offers a method to create functional materials with tunable properties.
  • Chitosan-based hydrogels are explored for biomedical applications but require optimization.

Purpose of the Study:

  • To develop fiber-reinforced composite hydrogels with improved mechanical strength, reduced gelling time, and excellent cytocompatibility.
  • To evaluate the feasibility of using hydroxyapatite and polyelectrolyte complex (PEC) self-assembled fibers in a chitosan-based thermogelling system.
  • To optimize hydrogel formulations for cell encapsulation, growth, and proliferation under physiological conditions.

Main Methods:

  • Fabrication of chitosan-based hydrogels reinforced with PEC self-assembled fibers and hydroxyapatite.
  • Investigation of the effect of β-glycerophosphate (βGP) concentration on gelation time.
  • Characterization of mechanical properties (Young's modulus), gelation kinetics, and porous structure.
  • Assessment of cytocompatibility using MTT assays and confocal imaging with MG63 cells.
  • Analysis of molecular interactions using Fourier-transform infrared spectroscopy (FTIR).

Main Results:

  • Fiber-reinforced hydrogels demonstrated a three-fold increase in stiffness (Young's modulus) compared to conventional chitosan-βGP gels.
  • Gelation time was significantly reduced to 3 minutes under physiological conditions (pH and temperature).
  • The hydrogels exhibited porous structures and supported >80% cell viability and proliferation for MG63 cells.
  • FTIR analysis confirmed molecular interactions between gelling agents, hydroxyapatite, and PEC fibers.

Conclusions:

  • The developed fiber-reinforced composite hydrogels overcome key limitations of traditional injectable hydrogels.
  • The combination of hydroxyapatite and polymer self-assembly provides an efficient strategy for creating advanced injectable biomaterials.
  • These improved hydrogels hold significant promise for minimally invasive biomedical applications, including tissue regeneration.