Gallium-containing phospho鈥恠ilicate glasses: Synthesis and in vitro bioactivity

详细信息	查看全文 | 推荐本文 |

• 作者：Mirco Franchini ; Gigliola Lusvardi ; Gianluca Malavasi ; ^{gmalavasi@unimo.it} ; Ledi Menabue
• 关键词：Phospho-silicate glasses ; Gallium oxide ; Bioactivity test
• 刊名：Materials Science and Engineering ; C
• 出版年：2012
• 期刊代码：63_09284931
• 类别：ms
• 出版时间：1 August, 2012
• 卷：32
• 期：6
• 页码：1401-1406
• 文件大小：844 K

摘要

A series of Ga-containing phospho-silicate glasses based on Bioglass 45S5, having molar formula 46.2SiO₂路24.3Na₂O路26.9CaO路2.6P₂O₅路xGa₂O₃ (x = 1.0, 1.6, 3.5), were prepared by fusion method. The reference Bioglass 45S5 without gallium was also prepared. The synthesized glasses were immersed in simulated body fluid (SBF) for 30 days in order to observe ion release and hydroxyapatite (HA) formation. All Ga-containing glasses maintain the ability of HA formation as indicated by main X-ray diffractometric peaks and/or electronic scanning microscopy results. HA layer was formed after 1 day of SBF soaking in 45S5 glass containing up to 1.6%Ga₂O₃ content. Moreover, gallium released by the glasses was found to be partially precipitated on the glass surface as gallium phosphate. Further increase in gallium content reduced the ion release in SBF. The maximum of Ga³⁺ concentration measured in solution is ~ 6 ppm determined for 3.5%Ga₂O₃ content. This amount is about half of the toxic level (14 ppm) of gallium and the glasses release gallium till 30 days of immersion in SBF. Considering the above results, the studied materials can be proposed as bioactive glasses with additional antimicrobial effect of gallium having no toxic outcome.