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Quantification of polyphosphoinositides using selected ion monitoring electrospray mass spectrometry
Author(s) -
Michelsen Peter,
Jergil Bengt,
Odham Göran
Publication year - 1995
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290091206
Subject(s) - chemistry , electrospray , mass spectrometry , ion , molecule , chromatography , deprotonation , analytical chemistry (journal) , electrospray ionization , tandem mass spectrometry , organic chemistry
Polyphosphoinositides (PIP) and (PIP 2 ) show prominent negative singly and doubly charged deprotonated molecules in electrospray mass spectrometry. These ions can be used for quantification of PIP and PIP 2 in the low picomole range, without prior chromatographic separation, using selected ion monitoring and consecutive measurements of the signals from the deprotonated singly charged molecules. The dose response curves for both compounds are linear. In a complex matrix consisting of polar lipids (Folch extract) PIP and PIP 2 monitored at m/z 965.4 and 1045.5 (stearoyl and arachidonoyl) were determined in the low picomole range, at a flow rate of 100 μL/min. Collision‐induced decomposition of PIP and PIP 2 using a mixture of xenon and argon at 25 eV afforded identical high mass ions formed by loss of a molecule of water from PIP and a phosphate group and a molecule of water from PIP 2 . The results indicate that polyphosphoinositides, and biologically relevant changes in their concentrations, can be quantified directly in cells and cellular membranes by selected‐ion monitoring with electrospray mass spectrometry.