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|Title:||Formation of oligomeric alkenylperoxides during the oxidation of unsaturated fatty acids: an electrospray ionization tandem mass spectrometry study|
|Author:||Villaverde, Juan José|
Santos, Sónia A. O.
Simões, Mário M. Q.
Pascoal Neto, Carlos
Domingues, M. Rosário M.
Silvestre, Armando J. D.
|Keywords:||Fenton’s and Fe2+/O2 systems|
Unsaturated fatty acids
|Publisher:||John Wiley and Sons|
|Abstract:||This study reports the identification of oligomeric alkenylperoxides by electrospray ionization mass spectrometry (ESI-MS) and tandem mass spectrometry (ESI-MS2), during the oxidation of oleic, linoleic and linolenic acids with Fenton's (Fe2+/H2O2) and Fe2+/O2 systems. The reactions were followed by ferrous oxidation-xylenol orange method together with GC-MS and GC-FID, allowing to observe that both oxidation systems are different in terms of hydroperoxide evolution, probably due to the presence of different intermediate reactive species: perferryl ion and OH radical responsible for the decomposition of lipid hydroperoxides and formation of new compounds. The analysis of ESI-MS in the negative mode, obtained after oxidation of each fatty acid, confirmed the presence of the monomeric oxidation products together with other compounds at high mass region above m/z 550. These new ions were attributed to oligomeric structures, identified by the fragmentation pathways observed in the tandem mass spectra. Copyright (C) 2012 John Wiley & Sons, Ltd.|
|Appears in Collections:||CICECO - Artigos|
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|J.Mass.Spectrom.2012 47 163_172.pdf||450.67 kB||Adobe PDF|
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