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Development and Characterization of Collagen Composites With Chemically Functionalized Mesoporous Silica Particles
Christian E Olivetti1,2, María I Alvarez Echazú3,4, Sandra J Renou3
1Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Cátedra de Química Analítica Instrumental, Buenos Aires, Argentina.
Journal of Biomedical Materials Research. Part A
|May 28, 2026
Summary
Mesoporous silica particles (MSPs) modified with different functional groups were incorporated into collagen hydrogels for bone tissue engineering. Surface chemistry impacts interactions, drug loading, and biological response, but mineralization was not observed.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Nanotechnology
Background:
- Mesoporous silica particles (MSPs) offer high surface area and tunable porosity for biomaterial applications.
- Functionalization of MSPs is key to controlling their interaction with biological matrices like collagen.
Purpose of the Study:
- To investigate the impact of anionic functional groups on MSPs incorporated into collagen hydrogels for bone tissue engineering.
- To evaluate structural, biological, and drug-loading properties of these hybrid composites.
Main Methods:
- MSPs functionalized with carboxyl, phosphate, and sulfonate groups were synthesized.
- Incorporation into Type I collagen hydrogels.
- Comprehensive analysis including FTIR, SEM/EDS, zeta potential, porosity, drug loading, cytocompatibility, in vitro mineralization, and in vivo studies.
Main Results:
- Phosphate-modified MSPs exhibited cytotoxicity and interfered with collagen assembly.
- Hydroxyl or carboxyl groups on MSPs improved cytocompatibility and distribution.
- Sulfonate-functionalized MSPs showed enhanced simvastatin loading.
- No significant in vitro or in vivo mineralization or bone formation was observed.
Conclusions:
- The surface chemistry of MSPs significantly influences their integration with collagen hydrogels and biological performance.
- Excessive negative surface charge may hinder ion-mediated mineralization.
- Careful balancing of MSP chemistry and the biological environment is crucial for designing effective bone tissue engineering scaffolds.
