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Gallium-containing phosphosilicate glasses: functionalization and in-vitro bioactivity.
Gigliola Lusvardi1, Gianluca Malavasi, Ledi Menabue
1Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Modena, Italy.
Summary
Functionalizing bioactive glasses with TEOS and APTS enhances biomolecule bonding. These modified glasses maintain bioactivity, forming apatite layers in simulated body fluid without releasing gallium.
Area of Science:
- Biomaterials Science
- Materials Chemistry
- Biotechnology
Background:
- Bioactive glasses, like Bioglass® 45S5, exhibit excellent bone regeneration properties.
- Enhancing the surface chemistry of bioactive glasses is crucial for improved drug delivery and protein immobilization.
- Gallium-containing glasses offer potential therapeutic benefits, but their surface interactions require further investigation.
Purpose of the Study:
- To functionalize a gallium-containing bioactive glass (Ga1.0) and its parent Ga-free glass (H) using Tetraethoxysilane (TEOS) and (3-Aminopropyl)triethoxysilane (APTS).
- To investigate the effect of functionalization on the surface chemistry and in vitro bioactivity of these glasses.
- To assess the potential for improved biomolecule bonding and gallium ion stability.
Main Methods:
- Synthesis of gallium-containing (Ga1.0) and gallium-free (H) bioactive glasses.
- Surface functionalization using TEOS (to introduce OH groups) and APTS (to introduce NH2 groups).
- Characterization using IR spectroscopy and elemental analysis; in vitro assessment in simulated body fluid (SBF).
Main Results:
- Successful functionalization of both glasses, confirmed by the presence of OH and NH2 groups.
- Functionalized glasses maintained their bioactivity, forming an apatite layer within 30 days in SBF.
- APTS-functionalized glasses also showed CaCO3 formation on their surfaces.
- No detectable gallium release was observed during SBF immersion.
Conclusions:
- TEOS and APTS functionalization effectively modifies the surface of bioactive glasses, enhancing their potential for biomolecule conjugation.
- The functionalization process preserves the inherent bioactivity of the glasses, promoting apatite formation.
- Gallium-containing bioactive glasses can be surface-modified without compromising gallium stability in physiological conditions.
