Journal
EUROPEAN JOURNAL OF MASS SPECTROMETRY
Volume 11, Issue 4, Pages 409-417Publisher
IM PUBLICATIONS
DOI: 10.1255/ejms.760
Keywords
mass spectrometry; atmospheric pressure photoionization; phosphatidylcholine; fragmentation
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The potential of atmospheric pressure photoionization was investigated for the structural analysis of phosphatidylcholine lipids (PCs). [M+H](+) ions of high abundance were obtained, along with several fragment ions. Three of these dissociation products corresponded to quite unusual fragmentation pathways but allowed the determination of both the nature and the position on the glycerol backbone (sn-1 or sn-2) of the fatty acyl chains. The loss of a methyl group from the choline head was also observed. These results suggest a complex ionization mechanism in atmospheric pressure photoionization. However, this method proved to be very powerful for the rapid structural analysis of PC species without using tandem mass spectrometry experiments.
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