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. Author manuscript; available in PMC: 2021 Jul 7.
Published in final edited form as: Anal Chem. 2020 Jun 16;92(13):9146–9155. doi: 10.1021/acs.analchem.0c01449

Figure 1.

Figure 1.

MS analysis of unsaturated GPLs from bacterial extracts: (a) Base peak LC-MS trace of Salmonella enterica serovar Typhimurium (S. Typhimurium) lipid extract with XIC of m/z 714.51 highlighted. (b) HCD mass spectrum of m/z 714.51. (c) 193 nm UVPD mass spectrum (eight pulses, 2.5 mJ per pulse) of m/z 714.51. (d) Fragment ion map of m/z 714.51 identified as PE 16:1(9Δ)_18:1(11Δ). (Fragmentation sites are color-coded to correspond to the ions identified in panels b and c.) (e) List of all identified unsaturated GPLs in S. typhimurium lipid extract using LC-MS/MS with alternating HCD and UVPD.