Commonly occurring product ions for PC(13:0/20:0) (View full structure)

m/zIon DescriptionStructure (click to enlarge)
747.5784Precursor ion [M+]-
732.5549Loss of CH3 and from precursor ion
661.4814Loss of choline and from precursor ion
536.3722Loss of sn1 acyl chain as ketene (RCH=C=O), CH3 and from precursor ion
518.3616Neutral loss of sn1 RCOOH group, loss of CH3 and from precursor ion
438.2626Loss of sn2 acyl chain as ketene (RCH=C=O), CH3 and from precursor ion
420.2521Neutral loss of sn2 RCOOH group, loss of CH3 and from precursor ion
311.2956sn2 RCOO- ion
224.0693Glycerophosphocholine with loss of CH3 and H2O
213.1860sn1 RCOO- ion
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