Combined experimental and computational characterization of crosslinked collagen-based hydrogels

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biophysics

Background:

• Collagen hydrogels are vital for in-vitro studies and tissue engineering due to biocompatibility.
• Native collagen hydrogels often lack optimal mechanical properties like stiffness.
• Hydrogel mechanics depend on filament network architecture and properties.

Purpose of the Study:

• To investigate the impact of transglutaminase crosslinking on collagen hydrogel mechanical properties.
• To explore the relationship between collagen concentration and gel rigidity.
• To adapt a computational model for predicting collagen hydrogel mechanics.

Main Methods:

• Investigated collagen hydrogels with varying collagen concentrations.
• Utilized transglutaminase as a crosslinking agent.
• Adapted a worm-like chain (WLC) computational model to analyze mechanical behavior.

Main Results:

• Observed a linear correlation between gel rigidity and collagen concentration.
• Transglutaminase addition resulted in earlier strain-stiffening of collagen gels.
• The adapted WLC model successfully reproduced experimental mechanical behaviors.

Conclusions:

• Collagen concentration directly influences hydrogel stiffness.
• Transglutaminase crosslinking enhances mechanical performance by inducing earlier strain-stiffening.
• The computational model provides a method to estimate biopolymer network parameters and predict mechanical properties.