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Desorption/ionization on porous silicon mass spectrometry (DIOS) of model cationized fatty acids

✍ Scribed by Natali Budimir; Jean-Claude Blais; Françoise Fournier; Jean-Claude Tabet

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
625 KB
Volume
42
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

Desorption/ionization on porous silicon (DIOS) is a very useful technique in the case of small molecular weight compounds, compared to the matrix‐assisted laser desorption ionization (MALDI). This is because MALDI generates matrix‐related ions that overlap with the mass range of interest. The aim of our work was to investigate the suitability of the DIOS technique in the case of fatty acids in negative ion mode. The analysis of the chosen fatty acid models, nonadecanoic acid (C~19~H~38~O~2~) and heneicosanoic acid (C~21~H~42~O~2~), gave rise to the observation of the deprotonated monomeric species and selective cationized multimeric species. This cation selectivity was further elucidated by complementary studies based on the addition of various metals such as Ag^I^, Zn^II^, Fe^II^, and also Cu^II^. Specific behavior, depending upon the introduced metal, was highlighted by different redox reaction processes and also metastable decompositions (in PSD mode). Copyright © 2006 John Wiley & Sons, Ltd.

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