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Evaluating the challenges associated with time-of-fight secondary ion mass spectrometry for metabolomics using pure and mixed metabolites

Journal article
Authors John S. Fletcher
Helen L Kotze
Emily G. Armitage
Nicholas P Lockyer
John C. Vickerman
Published in Metabolomics
Volume 9
Issue 3
Pages 535-544
ISSN 1573-3882
Publication year 2013
Published at Department of Chemistry and Molecular Biology
Pages 535-544
Language en
Links dx.doi.org/10.1007/s11306-012-0487-...
Keywords Secondary ion mass spectrometry ToF-SIMS Metabolomics Metabolite MSMS Matrix effects
Subject categories Analytical Chemistry

Abstract

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is potentially well placed to contribute to metabolomic analysis while bringing the added benefit of high resolution, label free imaging. The focused ion beams used to desorb species from the sample can be focused below 1 μm allowing chemical imaging on a sub-cellular scale. In this study we test the capability of ToF-SIMS to generate mass spectrometry and MSMS spectra from a set of standard metabolites that can be compared with open access metabolite databases containing ESI-CID MSMS spectra. The influence of the chemical environment, the matrix effect, on the observed mass spectra is assessed using a mixed metabolite sample and the data discussed in terms of compound identification and quantification. Radical ions and small fragment ions seem to be less sensitive to ion suppression or enhancement and may provide a route to quantification. Understanding such parameters will be key for the successful application of the technique for in situ metabolomics with ToF-SIMS.

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