Commonly occurring product ions for PE(20:4(5Z,8Z,11Z,14Z)/16:0) (View full structure)

m/zIon DescriptionStructure (click to enlarge)
738.5079Precursor ion [M-H]-
500.2783Loss of sn2 acyl chain as ketene (RCH=C=O) from [M-H]-
482.2677Neutral loss of sn2 RCOOH group from [M-H]-
452.2783Loss of sn1 acyl chain as ketene (RCH=C=O) from [M-H]-
434.2677Neutral loss of sn1 RCOOH group from [M-H]-
303.2330sn1 RCOO- ion
259.2431Loss of CO2 from sn1 RCOO- ion (PUFA)
255.2330sn2 RCOO- ion
152.9958Glycerol-3-phosphate ion with loss of H2O
140.0118Ethanolamine phosphate ion
122.0013Ethanolamine 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