Highly-Bioreactive Silica-Based Mesoporous Bioactive Glasses Enriched with Gallium(III)

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Tissue Engineering

Background:

• Gallium (Ga³⁺) ions are known for beneficial effects on bone cell growth and antibacterial action.
• Mesoporous bioactive glasses (MBGs) are investigated for tissue engineering applications.
• Incorporating gallium into MBGs can enhance their therapeutic potential.

Purpose of the Study:

• To synthesize and characterize gallium-enriched MBGs.
• To evaluate the in vitro bioactivity and ion release of these gallium-doped MBGs.
• To assess the potential of these materials for tissue engineering applications.

Main Methods:

• Synthesis of three gallium-enriched MBGs (Ga₁, Ga₂, Ga₃) and one gallium-free MBG (B) with varying compositions.
• ²⁹Si and ³¹P Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) analyses.
• In vitro bioactivity testing in simulated body fluid (SBF).
• Gallium ion release studies in Todd Hewitt Broth culture medium.

Main Results:

• ²⁹Si and ³¹P MAS NMR confirmed Ga³⁺ acts as both a network modifier and former depending on glass composition.
• Ga₁ and Ga₂ MBGs demonstrated rapid in vitro bioactivity, forming an apatite-like layer within 1-3 days in SBF.
• Ga₁ MBG released high, non-cytotoxic levels of Ga³⁺ ions, significantly exceeding the inhibitory concentration for *Pseudomonas aeruginosa*.

Conclusions:

• Gallium incorporation into MBGs influences their structure and bioactivity.
• Gallium-enriched MBGs show potential for enhanced tissue engineering applications due to their bioactivity and ion release profile.
• Further biological evaluation is warranted to fully explore the therapeutic capabilities of these gallium-doped MBGs.