Liquid atmospheric pressure matrix-assisted laser desorption/ionization mass spectrometry using a commercial ion source and orbitrap mass analyzer

Challen, B. ORCID: https://orcid.org/0000-0001-7970-3697, Adair, L. R. and Cramer, R. ORCID: https://orcid.org/0000-0002-8037-2511 (2024) Liquid atmospheric pressure matrix-assisted laser desorption/ionization mass spectrometry using a commercial ion source and orbitrap mass analyzer. Analytical Chemistry, 96 (40). pp. 15865-15870. ISSN 1520-6882 doi: 10.1021/acs.analchem.4c04458

Abstract/Summary

A liquid atmospheric pressure-matrix-assisted laser desorption/ionization (LAP-MALDI) method has been developed and applied to a commercial AP-MALDI source on a hybrid orbitrap mass analyzer. It is shown that electrospray ionization (ESI)-like mass spectra of a range of peptides and proteins can be acquired by LAP-MALDI mass spectrometry (MS) as previously demonstrated on a home-made LAP-MALDI-Q-TOF setup but without the need of any modification to the commercially available MS equipment used. Multiply charged peptide ions were recorded with a resolution of around 100,000 and a mass accuracy of less than 5 ppm. The higher resolution and mass accuracy of the orbitrap analyzer compared to previously employed Q-TOF instrumentation provided high confidence in bacterial proteoform and species identification by top-down protein analysis.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/118598
Identification Number/DOI	10.1021/acs.analchem.4c04458
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Mass Spectrometry (CAF)
Publisher	American Chemical Society
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