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. Author manuscript; available in PMC: 2009 Sep 21.
Published in final edited form as: J Am Soc Mass Spectrom. 2007 Feb 14;18(4):783–790. doi: 10.1016/j.jasms.2006.12.012

Figure 3.

Figure 3

The product-ion spectrum of the ion at m/z 743 obtained with (a) a TSQ, and (b) an IT instrument. Panel (c) is the IT MS2-spectrum of the ion at m/z 757, which may consist of a h18:3/Δ316:1-PG structure. The presence of the hydroxylated 18:3-fatty acid substituent is consistent with the presence of a prominent ion at m/z 275, corresponding to loss of H2O from m/z 293, as shown in the MS3-spectrum of m/z 293 (757 → 293) (d).