Commonly occurring product ions for PC(21:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) (View full structure)

m/zIon DescriptionStructure (click to enlarge)
875.6410Precursor ion [M+]-
860.6175Loss of CH3 and from precursor ion
789.5440Loss of choline and from precursor ion
552.3096Loss of sn1 acyl chain as ketene (RCH=C=O), CH3 and from precursor ion
550.3878Loss of sn2 acyl chain as ketene (RCH=C=O), CH3 and from precursor ion
534.2990Neutral loss of sn1 RCOOH group, loss of CH3 and from precursor ion
532.3773Neutral loss of sn2 RCOOH group, loss of CH3 and from precursor ion
327.2330sn2 RCOO- ion
325.3112sn1 RCOO- ion
283.2431Loss of CO2 from sn2 RCOO- ion (PUFA)
224.0693Glycerophosphocholine with loss of CH3 and H2O
168.0431Phosphocholine with loss of CH3
152.9958Glycerol-3-phosphate ion with loss of H2O
96.9696H2PO4- ion (from phosphate)
78.9591PO3- ion (from phosphate)
Note: Structures of product ions may represent one of a number of possible isobaric molecules in some cases