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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2019 Feb 12;30(4):659–668. doi: 10.1007/s13361-018-02125-y

Figure 2.

Figure 2.

Defining Lipid Fragmentation. (a) Lipid structural component classification of Cer[AS] d18:1_14:0 [M+Ac-H]−used for constructing and defining lipid fragment types. For fragmentation mapping, the lipid adduct and headgroup are considered one unit. (b) Allowed lipid fragment type definitions for Cer[AS] d18:1_14:0 [M+Ac-H]− defined in terms of headgroup m/z (blue square), sphingoid backbone m/z (orange square), fatty acid m/z (green square), fragment m/z (spectral peaks), and rule specific modifier m/z (question mark). Each transformation used to generate annotation spectra is simply the corresponding fragment definition solved for the rule modifier.