Novel hydrogel obtained by chitosan and dextrin-VA co-polymerization

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Materials Engineering

Background:

• Chitosan and dextran are biocompatible polysaccharides with potential in hydrogel formation.
• Developing novel hydrogels without chemical cross-linking agents is desirable for biomedical applications.
• Enzymatic cross-linking offers a greener alternative for hydrogel synthesis.

Purpose of the Study:

• To synthesize a novel hydrogel via enzymatic cross-linking of chitosan with vinyl acrylate-modified dextran (dextrin-VA).
• To characterize the physical properties, including mechanical behavior and porous structure, of the synthesized hydrogel.
• To evaluate the glucose diffusion characteristics within the hydrogel matrix.

Main Methods:

• Hydrogel synthesis through enzymatic cross-linking of chitosan and dextrin-VA.
• Rheological measurements to determine storage (G') and loss (G'') moduli.
• Scanning Electron Microscopy (SEM) to analyze the hydrogel's microstructure.
• Glucose diffusion studies to quantify transport properties.

Main Results:

• A novel hydrogel was successfully synthesized using chitosan and dextrin-VA without external cross-linking agents.
• The hydrogel demonstrated solid-like viscoelastic behavior (G' >> G'').
• SEM analysis revealed a porous structure with pore sizes ranging from 50 to 150 micrometers.
• Glucose diffusion coefficients were measured at approximately 3.9 x 10⁻⁶ cm²/s and 2.9 x 10⁻⁶ cm²/s for different dextrin-VA substitution degrees.

Conclusions:

• The enzymatic cross-linking approach provides a viable method for creating chitosan-dextrin based hydrogels.
• The synthesized hydrogel possesses favorable mechanical properties and a porous architecture.
• The tunable glucose diffusion characteristics suggest potential applications in controlled release systems.