Semi-Interpenetrated Polymeric Networks of Chitosan and Poly(γ-Glutamic Acid) with Potential Biomedical Applications

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Hydrogels mimic biological tissues due to their elasticity, porosity, and water absorption.
• Semi-interpenetrating polymer networks (semi-IPNs) offer improved properties over individual polymers.
• Chitosan and poly-(γ-glutamic acid) (γ-PGA) are biocompatible polymers with potential in biomedical applications.

Purpose of the Study:

• To synthesize and characterize chitosan/γ-PGA semi-IPN hydrogels.
• To evaluate the structural, mechanical, and swelling properties of these novel hydrogels.
• To assess the biocompatibility and potential of these hydrogels for biomedical applications.

Main Methods:

• Fourier transform infrared spectroscopy (FTIR) for chemical structure confirmation.
• Scanning electron microscopy (SEM) for morphological analysis.
• Thermogravimetric analysis (TGA), porosity testing, compressive strength, cell viability, and swelling capacity tests were performed.

Main Results:

• FTIR confirmed the presence of both chitosan and γ-PGA functional groups.
• SEM revealed a porous structure that became denser with increased γ-PGA content.
• Hydrogels exhibited pH and temperature-dependent swelling, with SF1 showing a high swelling ratio at pH 3.6 and 37 °C. Mechanical properties and biocompatibility were improved compared to chitosan hydrogels alone.

Conclusions:

• Chitosan/γ-PGA semi-IPNs demonstrate enhanced mechanical properties and improved biocompatibility.
• The developed hydrogels show tunable swelling behavior, sensitive to pH and temperature.
• These findings indicate significant potential for chitosan/γ-PGA semi-IPN hydrogels in diverse biomedical applications.