Nano- and Microstructures of Collagen-Nanocellulose Hydrogels as Engineered Extracellular Matrices

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Materials Characterization

Background:

• The extracellular matrix (ECM) is crucial for tissue structure and cell signaling.
• Three-dimensional (3D) tissue models utilize hydrogels to mimic the ECM in vitro.
• Collagen-nanocellulose (COL-NC) hydrogels are promising biomaterials for 3D models, but their structure is not well understood.

Purpose of the Study:

• To investigate the structural organization of collagen-nanocellulose (COL-NC) hydrogels.
• To determine the effects of incorporating nanocellulose (NC) fibers into collagen (COL) hydrogels.
• To elucidate polymer organization at nano- and micron-scales using scattering techniques.

Main Methods:

• Small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS) were employed.
• These techniques analyzed the hierarchical structure of COL-NC hydrogels.
• Structural parameters including fiber dimensions and interfiber distances were determined.

Main Results:

• Nanocellulose (NC) expanded and increased the homogeneity of the collagen (COL) network.
• The inherent fiber properties of both collagen and nanocellulose remained unaffected.
• Cells cultured within COL-NC hydrogels remodeled the network but did not significantly alter its architecture.

Conclusions:

• This study reveals the polymer organization within COL-NC hydrogels.
• SANS and USANS are powerful tools for characterizing hydrogel nano- and micron-scale structures.
• Understanding COL-NC hydrogel structure is key for engineering novel ECM mimics for tissue models.