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The MS2 spectrum of the M+ ions of Δ918:1-AMPP at m/z 449 obtained with low energy CID (a), HCD (b) LIT, and with high energy MALDI LIFT TOF-TOF (c). Panel d and Panel e show the MALDI LIFT TOF-TOF spectra of Δ618:1-AMPP (d) and Δ1118:1-AMPP (e) isomers, respectively. High energy CID TOF-TOF (Panels c, d, and e) yielded fragment ions from CRF losses of CnH2n+2 residues which are informative for complete structural characterization including double bond and the entire aliphatic tail.
