Chitosan-based enzyme-immobilized nanocomposite cryogels with controlled biodegradation profile

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Tissue engineering scaffolds require degradation rates matched to new tissue formation.
• Controlling scaffold degradation is crucial for successful tissue regeneration and functional recovery.
• Poly(glycerol carbonate methacrylate) (p(GCMA)) nanoparticles offer tunable properties for biomaterial development.

Purpose of the Study:

• To synthesize and characterize p(GCMA) nanoparticles.
• To incorporate these nanoparticles into chitosan-based cryogels.
• To evaluate the resulting nanocomposite cryogels for controlled degradation and biomedical applications.

Main Methods:

• Synthesis of p(GCMA) nanoparticles (∼50 nm).
• Fabrication of chitosan-based nanocomposite cryogels with p(GCMA).
• Characterization of cryogel structure, swelling, mechanical, and thermal properties.
• Enzyme immobilization and assessment of controlled biodegradation under physiological conditions.
• Biocompatibility testing using L929 fibroblast cells.

Main Results:

• p(GCMA) nanoparticles were successfully synthesized.
• Nanocomposite cryogels exhibited macroporous structure (55-60 μm) and high swelling capacity (23-35x dry weight).
• p(GCMA) incorporation enhanced cryogel flexibility and thermal stability.
• Cryogels immobilized up to 7 mg/g protease, enabling sustained release and controlled biodegradation.
• Cryogels with 50 mg/mL p(GCMA) showed ~17% weight loss over 15 days, while pure chitosan cryogels remained undegraded.
• No significant cytotoxicity was observed in L929 fibroblast cell assays.

Conclusions:

• Chitosan-based nanocomposite cryogels incorporating p(GCMA) nanoparticles demonstrate tunable degradation properties.
• These materials offer controlled enzyme release and biodegradation, suitable for tissue engineering scaffolds.
• The developed nanocomposite cryogels are biocompatible and show significant potential for biomedical applications.