Commonly occurring product ions for PA(20:4(5Z,8Z,11Z,14Z)/22:0) (View full structure)

m/zIon DescriptionStructure (click to enlarge)
779.5596Precursor ion [M-H]-
493.3300Loss of sn1 acyl chain as ketene (RCH=C=O) from [M-H]-
475.3194Neutral loss of sn1 RCOOH group from [M-H]-
457.2361Loss of sn2 acyl chain as ketene (RCH=C=O) from [M-H]-
439.2255Neutral loss of sn2 RCOOH group from [M-H]-
339.3269sn2 RCOO- ion
303.2330sn1 RCOO- ion
259.2431Loss of CO2 from sn1 RCOO- ion (PUFA)
171.0064Glycerol-3-phosphate ion
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