Carboxymethyl chitosan-glycerol multi-aldehyde based self-healing hydrogel system

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Chemistry

Background:

• Self-healing hydrogels with dynamic covalent chemistry offer robust network structures resilient to environmental changes.
• Schiff base reactions provide dynamic covalent bonds suitable for physiological conditions (pH, temperature).

Purpose of the Study:

• Investigate gelation kinetics between glycerol multi-aldehyde (GMA) and carboxymethyl chitosan (CMCS).
• Evaluate the self-healing capabilities and cytotoxicity of the resulting hydrogels.

Main Methods:

• Synthesized hydrogels using GMA and CMCS.
• Characterized hydrogels via macroscopic inspection, electron microscopy, and rheological tests.
• Assessed self-healing by applying alternating high and low strains.
• Evaluated cytotoxicity using direct cell encapsulation and double staining tests.

Main Results:

• Optimal self-healing capacity observed at 3-4% CMCS and 0.5-1% GMA concentrations.
• Hydrogels restored physical integrity after 200% strain application.
• No acute cytotoxicity detected on mammalian cells.

Conclusions:

• GMA-CMCS hydrogels demonstrate significant self-healing properties due to dynamic covalent Schiff base bonds.
• These biocompatible hydrogels show promise for soft tissue engineering applications.