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Unexpected observation of ion suppression in a liquid chromatography/atmospheric pressure chemical ionization mass spectrometric bioanalytical method

2004; Wiley; Volume: 18; Issue: 12 Linguagem: Inglês

10.1002/rcm.1477

1097-0231

Tim Sangster, Mike Spence, Peta Sinclair, Richard K. Payne, Christopher Smith,

Metabolomics and Mass Spectrometry Studies

Ion suppression is a well-known phenomenon in electrospray ionization (ESI) mass spectrometry. These suppression effects have been shown to adversely affect the accuracy and precision of quantitative bioanalytical methods using ion spray. Such suppression effects have not been as well defined in atmospheric pressure chemical ionization (APCI) and there is some debate whether these effects actually occur in the ionization process using APCI. Here an example is described where clear ion suppression was observed during studies on a model compound and three metabolites using APCI liquid chromatography/tandem mass spectrometry (LC/MS/MS).