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Low-collision (a) and high-collision (b) energy exact mass spectra of PC (16:0/18:2). The low-energy spectrum only contains the precursor ion at m/z 758.57038, whereas in the high-energy spectrum, various diagnostic fragments appear as the loss of the various FA chains at m/z 496.3410 and 478.32789 (the water loss) and 502.32807, which belong to the water loss of the chain at m/z 520.3407. Also, the major fragment ion at m/z 184.0733 can be seen corresponding to the polar head group.
