Effects of ion‐pairing reagents on the electrospray signal suppression of sulphonated dyes and intermediates
- 20 January 2004
- journal article
- research article
- Published by Wiley in Journal of Mass Spectrometry
- Vol. 39 (1) , 43-50
- https://doi.org/10.1002/jms.551
Abstract
High-performance liquid chromatography/mass spectrometry (HPLC/MS) analysis of anionic species such as sulphonic acid dyes and intermediates requires volatile ion-pairing mobile phase additives. Six di- and trialkylammonium acetates were compared with tetraalkylammonium salts and ammonium acetate in the concentration range 0–20 mmol l−1 as mobile phase additives for HPLC/MS of polysulphonated compounds. The effects of the structure and concentration of the ion-pairing reagents on the electrospray response of mono-, di- and tetrasulphonic aromatic acids and acid dyes were studied in detail. Further, five different mass analysers and instrument geometries were compared. A higher signal decrease is observed with linear geometry instruments in comparison to orthogonal or even Z-spray geometry mass spectrometers. The concentration of mobile phase additives has a significant influence on the abundance ratios of multiply charged ions in the mass spectra of polysulphonated compounds. The competing ions of sulphonic acids may also cause significant signal suppression. Copyright © 2004 John Wiley & Sons, Ltd.Keywords
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