Effect of pH on chitosan hydrogel polymer network structure.

Area of Science:

• Polymer Science
• Materials Science
• Biomaterials Engineering

Background:

• Chitosan forms versatile 3D polymer networks (hydrogels) with diverse applications.
• Understanding chitosan hydrogel behavior, particularly pH-dependent properties, is crucial for optimizing their use.
• Existing models may not fully capture the intricate relationship between pH, crosslinking, and mechanical response.

Purpose of the Study:

• To develop a coarse-grained model for chitosan hydrogels.
• To investigate the pH-dependent self-assembly and mechanical properties of chitosan hydrogels.
• To elucidate the molecular mechanisms underlying pH-induced changes in hydrogel structure and mechanics.

Main Methods:

• Development of a novel coarse-grained computational model for chitosan hydrogels.
• Simulation of chitosan hydrogel behavior across a range of pH conditions.
• Analysis of structural changes, crosslinking patterns, and elastic moduli.

Main Results:

• The model accurately predicts pH-dependent structural and mechanical property variations observed experimentally.
• Solution pH significantly influences the physical crosslinking pattern within the chitosan hydrogel.
• Specific molecular mechanisms driving changes in polymer crosslinking with pH were identified.

Conclusions:

• The developed coarse-grained model provides a valuable tool for studying chitosan hydrogels.
• The study highlights the critical role of pH-induced physical crosslinking in determining hydrogel elasticity.
• This work offers molecular insights into the design and application of chitosan-based materials.