31P MAS-NMR studies of phosphate salts formation on calcium-containing oxide glasses in a simulated body fluid

Satoshi Hayakawa, Kanji Tsuru, Hirohisa Iida, Chikara Ohtsuki, Akiyoshi Osaka

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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 1 d, and the chemical state of adsorbed phosphate ions were examined. The 31P chemical shift indicated that orthophosphate ions, HxPO4 -(3-x) (02O3; pyrophosphate ions, HzP2O7 -(4-z), 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 spectra, 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.

Original languageEnglish
Pages (from-to)1000-1003
Number of pages4
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume104
Issue number11
Publication statusPublished - Nov 1996

Fingerprint

body fluids
Body fluids
calcium oxides
Oxides
Calcium
phosphates
Phosphates
Salts
Nuclear magnetic resonance
Ions
salts
Glass
nuclear magnetic resonance
glass
ions
Apatites
soaking
Apatite
apatites
rabbits

Keywords

  • P MAS-NMR
  • Hydroxyapatite
  • Orthophosphate
  • Pyrophosphate
  • Simulated body fluid

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

31P MAS-NMR studies of phosphate salts formation on calcium-containing oxide glasses in a simulated body fluid. / Hayakawa, Satoshi; Tsuru, Kanji; Iida, Hirohisa; Ohtsuki, Chikara; Osaka, Akiyoshi.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 104, No. 11, 11.1996, p. 1000-1003.

Research output: Contribution to journalArticle

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AU - Osaka, Akiyoshi

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N2 - 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 1 d, and the chemical state of adsorbed phosphate ions were examined. The 31P chemical shift indicated that orthophosphate ions, HxPO4 -(3-x) (02O3; pyrophosphate ions, HzP2O7 -(4-z), 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 spectra, 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.

AB - 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 1 d, and the chemical state of adsorbed phosphate ions were examined. The 31P chemical shift indicated that orthophosphate ions, HxPO4 -(3-x) (02O3; pyrophosphate ions, HzP2O7 -(4-z), 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 spectra, 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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