A comparative study of secondary ion yield from model biological membranes using Aun + and C60 + primary ion sources

M. J. Baker, J. S. Fletcher, H. Jungnickel, N. P. Lockyer, J. C. Vickerman

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Abstract

Aun+ and C60+ primary ion sources have been used to acquire spectra from phospholipids, symmetric liposomes and asymmetric liposomes. We demonstrate that when using different ion beams different chemical information can be obtained. Symmetric and asymmetric liposomes, with 95% asymmetry, were produced and analysed with Au+, Au3+ and C60+ primary ion beams. C60+ gave the greatest yield from the symmetric liposome but after correcting for the yield effects on the data obtained from the asymmetric liposome it has been shown that C60+ is the most surface sensitive, providing the least information from the inner leaflet of the liposome. Aun+ provides the greatest amount of information from the inner leaflet. The results present the possibility of designing ToF-SIMS experiments that selectively probe specific regions of a (bio)molecular surface.

Original languageEnglish
Pages (from-to)6731-6733
Number of pages3
JournalApplied Surface Science
Volume252
Issue number19
Early online date3 May 2006
DOIs
Publication statusPublished - 30 Jul 2006

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Keywords

  • cluster ion beams
  • depth information
  • liposomes
  • phospholipids
  • polyatomic ions
  • yield enhancement

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