Bone-like Collagen Matrices Through Rapid Intrafibrillar Mineralisation

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biomineralization

Background:

• Bone tissue engineering requires scaffolds that mimic native bone's complex structure and mechanical properties.
• Current methods for creating biomimetic bone scaffolds are often slow and may not fully replicate natural mineralization processes.

Purpose of the Study:

• To introduce an innovative strategy, Rapid Fibrillogenic Mineralisation (RFM), for accelerated collagen self-assembly and mineralization.
• To generate bone scaffolds with biomimetic properties, enhanced density, and mechanical strength.

Main Methods:

• Utilized coprecipitation with 10× Simulated Body Fluid (10× SBF) during collagen fibril formation.
• Employed plastic compression driven by capillary action for rapid scaffold densification.
• Characterized mineral formation and scaffold properties using Transmission Electron Microscopy, X-ray Diffraction, Scanning Electron Microscopy, and Infrared Spectroscopy.

Main Results:

• Confirmed intrafibrillar hydroxyapatite crystal formation within 15 minutes and extrafibrillar mineralization within 6 hours.
• Achieved bone-like scaffold density and compressive moduli approaching cancellous bone (up to 283 ± 31 MPa).
• Demonstrated increased carbonate content indicating natural bone-like lattice substitutions and supported cellular growth.

Conclusions:

• RFM enables rapid, reproducible fabrication of biomimetic bone scaffolds that emulate native mineralization patterns and mechanical behavior.
• The process offers insights into bone physiology and in vitro modeling.
• RFM provides a translational approach for designing functional biomaterials for tissue engineering.