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. Author manuscript; available in PMC: 2018 Nov 8.
Published in final edited form as: J Am Chem Soc. 2017 Oct 25;139(44):15681–15690. doi: 10.1021/jacs.7b06416

Figure 2.

Figure 2

HCD/UVPD spectra of two double-bond positional PC isomers, sodium-cationized (A) PC 18:1(n-12)/18:1(n-12) and (B) PC 18:1(n-9)/18:1(n-9). These spectra were obtained by trapping the headgroup loss ions (m/z 625.5) generated by HCD and subjecting them to 10 laser pulses (193 nm) with 4 mJ per pulse.