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このアイテムを引用あるいはリンクする場合は次の識別子を使用してください  http://hdl.handle.net/10228/6039

タイトル: In vitro apatite formation and drug loading/release of porous TiO2 microspheres prepared by sol-gel processing with different SiO2 nanoparticle contents
著者: Kawashita, Masakazu
Tanaka, Yui
Ueno, Shoji
Liu, Gengci
Li, Zhixia
Miyazaki, Toshiki
Graduate School of Biomedical Engineering, Tohoku University
School of Engineering, Tohoku University
School of Engineering, Tohoku University
Graduate School of Biomedical Engineering, Tohoku University
School of Chemistry and Chemical Engineering, Guangxi University
Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology
キーワード: TiO2; Microsphere
Apatite
Rhodamine B
Bioactivity
Drug-release
発行日: 2015年2月17日
出版者: Elsevier
抄録: Bioactive titania (TiO2) microparticles can be used as drug-releasing cement fillers for the chemotherapeutic treatment of metastatic bone tumors. Porous anatase-type TiO2 microspheres around 15 μm in diameter were obtained through a sol–gel process involving a water-in-oil emulsion with 30:70 SiO2/H2O weight ratio and subsequent NaOH solution treatment. The water phase consisted of methanol, titanium tetraisopropoxide, diethanolamine, SiO2 nanoparticles, and H2O, while the oil phase consisted of kerosene, Span 80, and Span 60. The resulting microspheres had a high specific surface area of 111.7 m2·g− 1. Apatite with a network-like surface structure formed on the surface of the microspheres within 8 days in simulated body fluid. The good apatite-forming ability of the microspheres is attributed to their porous structure and the negative zeta potential of TiO2. The release of rhodamine B, a model for a hydrophilic drug, was rapid for the first 6 h of soaking, but diffusion-controlled thereafter. The burst release in the first 6 h is problematic for clinical applications; nonetheless, the present results highlight the potential of porous TiO2 microspheres as drug-releasing cement fillers able to form apatite.
URI: http://hdl.handle.net/10228/6039
出現コレクション:4 自然科学

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