Commonly occurring product ions for PI(O-16:0/21:0) (View full structure)

m/zIon DescriptionStructure (click to enlarge)
865.6175Precursor ion [M-H]-
703.5647Loss of inositol from [M-H]-
557.3096Loss of sn2 acyl chain as ketene (RCH=C=O) from [M-H]-
539.2991Neutral loss of sn2 RCOOH group from [M-H]-
395.2568Loss of sn2 acyl chain as ketene (RCH=C=O) and inositol from [M-H]-
377.2462Neutral loss of sn2 RCOOH group and inositol from [M-H]-
325.3112sn2 RCOO- ion
315.0487Glycerophosphoinositol -H2O
297.0381Glycerophosphoinositol -2H2O
259.0225Inositol phosphate ion
241.0119Inositol phosphate ion - H2O
223.0013Inositol phosphate ion - 2 H2O
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