Matrix-assisted laser desorption/ionisation mass spectra of antibiotic and cryptand complexes of alkali metal ions: a comparison with electrospray ionisation mass spectra

Eur. J. Mass Spectrom. 3, 229–232 (1997)
DOI: 10.1255/ejms.16

Matrix-assisted laser desorption/ionisation mass spectra of antibiotic and cryptand complexes of alkali metal ions: a comparison with electrospray ionisation mass spectra

Stephen F. Ralph^* and Margaret M. Sheil
Department of Chemistry, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia.
Elaine Scrivener and Peter J. Derrick
Institute of Mass Spectrometry and Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.

ABSTRACT:

Matrix-assisted laser desorption/ionisation (MALDI) mass spectra of samples containing valinomycin and all of the alkali metal ions suggest that the relative concentrations of metal complexes in solution play a role in determining relative peak intensities. However, in analogous studies performed using three cryptand ligands the most intense peak from a metal complex in each case was that due to the lithium complex, indicating that MALDI is not a reliable guide to the metal ion selectivities of this class of ligands.

Keywords: MALDI, electrospray, ESI-MS, mass spectrometry,valinomycin, cryptand.

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