Bioactivity and protein attachment onto bioactive glasses containing silver nanoparticles

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Biomedical Engineering

Background:

• Silver-containing glasses are of interest for bone replacement due to their antibacterial properties.
• Bioactive glasses promote bone regeneration by forming a carbonated apatite layer.
• Integrating silver into bioactive glass may enhance both antibacterial and osteoconductive capabilities.

Purpose of the Study:

• To synthesize and characterize silver-doped bioactive glasses within the CaO-SiO2-P2O5 system.
• To investigate the effect of silver incorporation on the glass matrix, bioactivity, and protein adsorption.
• To evaluate the potential of these materials for bone replacement applications.

Main Methods:

• Sol-gel synthesis of glasses with 2 and 8 mol% silver.
• Characterization using ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS).
• Bioactivity assessment via simulated body fluid (SBF) immersion tests and protein binding studies using cw-electron paramagnetic resonance (cw-EPR).

Main Results:

• Silver was successfully embedded into the glass matrix as nanoparticles.
• Silver incorporation preserved or improved the bioactivity of the base glass, promoting carbonated apatite formation.
• Enhanced protein binding to the silver-doped bioactive glass surface was observed.
• XPS confirmed silver presence and its state within the glass matrix.

Conclusions:

• Silver-doped CaO-SiO2-P2O5 glasses exhibit promising antibacterial and enhanced bioactive properties.
• The formation of carbonated apatite indicates good osteoconductivity, facilitating bone bonding.
• These silver-containing bioactive glasses are potential candidates for advanced bone graft substitutes.