Analytical and Bioanalytical Chemistry

, Volume 405, Issue 27, pp 8769–8780

Mass spectrometric monitoring of Sr-enriched bone cements—from in vitro to in vivo

  • Marcus Rohnke
  • Anja Henss
  • Julia Kokesch-Himmelreich
  • Matthias Schumacher
  • Seemun Ray
  • Volker Alt
  • Michael Gelinsky
  • Juergen Janek
Research Paper

DOI: 10.1007/s00216-013-7329-8

Cite this article as:
Rohnke, M., Henss, A., Kokesch-Himmelreich, J. et al. Anal Bioanal Chem (2013) 405: 8769. doi:10.1007/s00216-013-7329-8

Abstract

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a well-established technique in materials science, but is now increasingly applied also in the life sciences. Here, we demonstrate the potential of this analytical technique for use in the development of new bone implant materials. We tracked strontium-enriched calcium phosphate cements, which were developed for the treatment of osteoporotic bone, from in vitro to in vivo. Essentially, the spatial distribution of strontium in two different types of strontium-modified calcium phosphate cements is analysed by SIMS depth profiling. To gain information about the strontium release kinetics, the cements were immersed for 3, 7, 14 and 21 days in α-MEM and tris(hydroxymethyl)-aminomethane solution and analysed afterwards by ToF-SIMS depth profiling. For cements stored in α-MEM solution an inhibited strontium release was observed. By using principal component analysis to evaluate TOF-SIMS surface spectra, we are able to prove the adsorption of proteins on the cement surface, which inhibit the release kinetics. Cell experiments with human osteoblast-like cells cultured on the strontium-modified cements and subsequent mass spectrometric analysis of the mineralised extracellular matrix (mECM) prove clearly that strontium is incorporated into the mECM of the osteoblast-like cells. Finally, in an animal experiment, the strontium-doped cements are implanted into the femur of osteoporotic rats. After 6 weeks, only a slight release of strontium was found in the vicinity of the implant material. By using ToF-SIMS, it is proven that strontium is localised in regions of newly formed bone but also within the pre-existing tissue.

https://static-content.springer.com/image/art%3A10.1007%2Fs00216-013-7329-8/MediaObjects/216_2013_7329_Figa_HTML.gif
Figure

Schematic illustration of the performed measurements.

Keywords

Sr-enriched calcium phosphate cementsTime-of-flight secondary ion mass spectrometryOsteoporosisBone imagingBone implant interface

Supplementary material

216_2013_7329_MOESM1_ESM.pdf (789 kb)
ESM 1(PDF 788 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Marcus Rohnke
    • 1
  • Anja Henss
    • 1
  • Julia Kokesch-Himmelreich
    • 1
  • Matthias Schumacher
    • 2
  • Seemun Ray
    • 3
  • Volker Alt
    • 3
    • 4
  • Michael Gelinsky
    • 2
  • Juergen Janek
    • 1
  1. 1.Institute for Physical ChemistryJustus-Liebig-University of GiessenGiessenGermany
  2. 2.Centre for Translational Bone, Joint and Soft Tissue ResearchTechnische Universität DresdenDresdenGermany
  3. 3.Laboratory of Experimental Trauma SurgeryUniversity of GiessenGiessenGermany
  4. 4.Department of Trauma SurgeryUniversity Hospital of Giessen-MarburgGiessenGermany