Abstract
The very fast separation and identification of isomeric small substances with a molecular weight under 800 Da is still a challenge for high-throughput analysis. Inadequate chromatographic or spectrometric separation hampers an unequivocal identification of isomers, which may be recorded as a sum parameter. Reversed-phase liquid chromatography can be considered a generic method for the separation of isomers. However, a separation is usually achieved within minutes and not milliseconds as is typical for ion mobility spectrometry. The aim of this study, therefore, was to investigate the potential of IMS to separate small isomeric compounds. Hence, 23 substances divided into 11 isomeric groups have been selected. Among them, cancer drugs, hormones, pain relievers and others are contained. Three ion mobility spectrometers with different separation principles were compared with respect to their resolving performance. These systems comprised a traveling wave ion mobility spectrometer, a differential ion mobility spectrometer and a differential mobility analyzer. For reference, the chromatographic resolution and peak capacity was determined by high-performance liquid chromatography using a reversed phase.
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05 July 2019
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Acknowledgements
The authors would like to thank for financial aid support the German Federal Ministry for Economic Affairs and Energy within the agenda for the promotion of industrial cooperative research and development (IGF) on the basis of a decision by the German Bundestag. The access was opened by the German Federation of Industrial Research Association—AiF—and its member organisation Environmental Technology in short- member organization Environmental Technology (IGF Project No. 18861N). Special thanks to the technological SME SEADM, Dr. Marcus Winkler from Waters Corporation and Dr. Michael Schlüsener from the Bundesanstalt für Gewässerkunde for the kind opportunity to perform the resolution measurements on their systems. Additional thanks for the scientific exchange to Dr. Michaela Wirtz, Dr. Stefan Zimmermann and Dr. Terence Hetzel.
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Published in Chromatographia’s 50th Anniversary Commemorative Issue.
Published in the topical collection 24th International Symposium on Separation Sciences combined with 21st International Conference Analytical Methods and Human Health with guest editors Milan Hutta and Dušan Berek.
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Werres, T., Leonhardt, J., Jäger, M. et al. Critical Comparison of Liquid Chromatography Coupled to Mass Spectrometry and Three Different Ion Mobility Spectrometry Systems on Their Separation Capability for Small Isomeric Compounds. Chromatographia 82, 251–260 (2019). https://doi.org/10.1007/s10337-018-3640-z
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DOI: https://doi.org/10.1007/s10337-018-3640-z