<sup>31</sup>P MAS-NMR Studies of Phosphate Salts Formation on Calcium-Containing Oxide Glasses in a Simulated Body Fluid

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  • HAYAKAWA Satoshi
    Department of Bioengineering Science, Faculty of Engineering, Okayama University
  • TSURU Kanji
    Department of Bioengineering Science, Faculty of Engineering, Okayama University
  • IIDA Hirohisa
    Department of Bioengineering Science, Faculty of Engineering, Okayama University
  • OHTSUKI Chikara
    Department of Bioengineering Science, Faculty of Engineering, Okayama University
  • OSAKA Akiyoshi
    Department of Bioengineering Science, Faculty of Engineering, Okayama University

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  • 擬似体液中でカルシウム含有酸化物ガラス上に形成されたリン酸塩の<sup>31</sup>P MAS-NMRによる研究
  • 31P MAS-NMR Studies of Phosphate Salts

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Abstract

31P MAS-NMR spectra were measured for pulverized binary and ternary glasses containing Ca2+ ions after soaking in a simulated body fluid (Kokubo solution; pH=7.25) for 1d, and the chemical state of adsorbed phosphate ions were examined. The 31P chemical shift indicated that orthophosphate ions, HxPO4-(3-x) (0<x<3), were adsorbed on all the glasses but 60CaO⋅40Al2O3; pyrophosphate ions, HzP2O7-(4-z) (0<z<4), were detected on the aluminate glass, indicating that orthophosphate ions in the Kokubo solution were dimerized on the glass surface. For the glasses such as 60CaO⋅40Al2O3, 40CaO⋅60B2O3, 40CaO⋅30B2O3⋅30Al2O3 and 40CaO⋅30B2O3⋅30SiO2, those phosphate ions gave broad 31P MAS-NMR speetra, hence have a broad distribution by coordinating to the various surface sites of the glasses. On the other hand, sharp 31P MAS-NMR spectra as for a cortical bone (rabbit) were obtained for the rest of the glasses, 50CaO⋅50SiO2 and 40CaO⋅30B2O3⋅30TiO2, on which apatite formed in shorter soaking period in the Kokubo solution. It was thus concluded that presence of orthophosphate ions on the glass surfaces favored the deposition of apatite.

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