Beyond Reinforcement: Collagen-Inorganic Composites as a Roadmap for Next-Generation Biomaterials.

Area of Science:

• Biomaterials Science
• Materials Science
• Nanotechnology
• Biotechnology

Background:

• Collagen is a key natural polymer for biomaterials due to biocompatibility and extracellular matrix similarity.
• Limitations of native collagen include poor mechanical strength, rapid degradation, and insufficient bioactivity for clinical use.

Purpose of the Study:

• To review advances in collagen-inorganic composites for enhanced biomaterial functionality.
• To examine structure-property-function relationships, manufacturing, and translational challenges.
• To propose a roadmap for developing reproducible, multifunctional collagen-based biomaterials.

Main Methods:

• Bibliometric analysis to map research trends.
• Synthesis of evidence from recent studies on collagen-inorganic composites.
• Critical examination of hybridization strategies and interfacial phenomena.

Main Results:

• Incorporating inorganic phases (nanocarbons, nanoparticles, oxides) improves collagen properties, offering antimicrobial, osteoconductive, and responsive functionalities.
• Interfacial phenomena and structural organization (pores, fibers, topography) are critical for performance.
• Inconsistent results are linked to variations in collagen source, particle distribution, and cross-linking.

Conclusions:

• Mechanism-guided design is essential for predictable biological outcomes in collagen-inorganic composites.
• Addressing reproducibility and long-term safety is crucial for clinical translation.
• Future development requires integrated approaches linking composition, structure, and function.