Analysis of γ-irradiated synthetic bone grafts by 29Si MAS-NMR spectroscopy, calorimetry and XRD

D. Boyd, S. Murphy, M. R. Towler, A. W. Wren, Satoshi Hayakawa

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Ca-Sr-Zn-Si glasses have demonstrated excellent biocompatibility both in vitro using the MTT assay with L929 mouse fibroblast cells, and in vivo using healthy and ovariectomized female Wistar rats. However, the biological evaluation of the materials was performed on glass granules that were autoclaved, rather than γ-irradiated; the sterilisation procedure required prior to implantation of these materials in the human body. Given the fact that when a glass is exposed to ionizing radiation changes in its physical properties can take place, it is imperative to determine whether the structure of such glasses will be altered as a result of exposure to the typical amounts of γ-irradiation required to sterilise such materials prior to implantation. This paper examines the structure of Na-Ca-Sr-Zn-Si glasses using 29Si MAS-NMR, XRD and DTA and to evaluate the effect of 30 kGy γ-irradiation on their structure. The 29Si MAS-NMR results indicate that the peak maxima for each glass remains between -74 ppm and -79 ppm; a chemical shift for 29Si associated with Q1 units in silicate glasses, and that the local environment around the 29Si isotope remains unaltered as a result of exposure. Additional analysis (DTA and XRD) showed that the onset of the glass transition temperature, Tg (in the range 553 °C-619 °C depending on composition) typically remains unchanged, as a result of exposure to the ionizing radiation, as do the XRD diffractograms for each glass. Therefore it can be concluded that the use of 30 kGy γ-irradiation does not effect the local environment of the 29Si isotope in the glasses, nor does it significantly alter the XRD diffraction patterns or the Tg values for CaO-SrO-NaO-ZnO-SiO2 described in this work.

Original languageEnglish
Pages (from-to)2285-2288
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume355
Issue number45-47
DOIs
Publication statusPublished - Nov 1 2009

Fingerprint

Calorimetry
Grafts
bones
Nuclear magnetic resonance spectroscopy
Bone
heat measurement
Glass
nuclear magnetic resonance
glass
spectroscopy
Ionizing radiation
Irradiation
Isotopes
ionizing radiation
Differential thermal analysis
irradiation
implantation
thermal analysis
isotopes
Nuclear magnetic resonance

Keywords

  • Bioglass
  • Biomaterials

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Analysis of γ-irradiated synthetic bone grafts by 29Si MAS-NMR spectroscopy, calorimetry and XRD. / Boyd, D.; Murphy, S.; Towler, M. R.; Wren, A. W.; Hayakawa, Satoshi.

In: Journal of Non-Crystalline Solids, Vol. 355, No. 45-47, 01.11.2009, p. 2285-2288.

Research output: Contribution to journalArticle

Boyd, D. ; Murphy, S. ; Towler, M. R. ; Wren, A. W. ; Hayakawa, Satoshi. / Analysis of γ-irradiated synthetic bone grafts by 29Si MAS-NMR spectroscopy, calorimetry and XRD. In: Journal of Non-Crystalline Solids. 2009 ; Vol. 355, No. 45-47. pp. 2285-2288.
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