Self-assembled high-strength hydroxyapatite/graphene oxide/chitosan composite hydrogel for bone tissue engineering

Area of Science:

• Materials Science
• Biomaterials Engineering
• Nanotechnology

Background:

• Graphene hydrogels show promise in bone tissue engineering but often lack sufficient mechanical strength for practical applications.
• Developing robust and functional graphene-based hydrogels is crucial for advancing regenerative medicine.

Purpose of the Study:

• To develop a facile method for synthesizing a high-strength composite graphene hydrogel.
• To create a novel ternary composite hydrogel for enhanced bone tissue engineering applications.

Main Methods:

• Simultaneous crosslinking of chitosan with genipin and reduction of graphene oxide with sodium ascorbate.
• Self-assembly of graphene oxide, hydroxyapatite nanoparticles, and chitosan into a 3D hydrogel structure.

Main Results:

• The composite hydrogel exhibited a dense, oriented microstructure.
• Achieved high mechanical strength, excellent hydroxyapatite nanoparticle fixation, and high porosity.
• Demonstrated good biocompatibility, indicating suitability for bone regeneration.

Conclusions:

• The developed ternary composite graphene hydrogel is a promising material for bone tissue engineering due to its superior mechanical properties and biocompatibility.
• The simultaneous crosslinking and reduction strategy is versatile and applicable to various 3D graphene-polymer nanocomposites for diverse applications.