GC-QTOFMS with a low-energy electron ionization source for advancing isotopologue analysis in 13 C-based metabolic flux analysis

Analytical and Bioanalytical Chemistry
Teresa MairingerStephan Hann

Abstract

For the study of different levels of (intra)cellular regulation and condition-dependent insight into metabolic activities, fluxomics experiments based on stable isotope tracer experiments using 13C have become a well-established approach. The experimentally obtained non-naturally distributed 13C labeling patterns of metabolite pools can be measured by mass spectrometric detection with front-end separation and can be consequently incorporated into biochemical network models. Here, despite a tedious derivatization step, gas chromatographic separation of polar metabolites is favorable because of the wide coverage range and high isomer separation efficiency. However, the typically employed electron ionization energy of 70 eV leads to significant fragmentation and consequently only low-abundant ions with an intact carbon backbone. Since these ions are considered a prerequisite for the analysis of the non-naturally distributed labeling patterns and further integration into modeling strategies, a softer ionization technique is needed. In the present work, a novel low energy electron ionization source is optimized for the analysis of primary metabolites and compared with a chemical ionization approach in terms of trueness, precision, a...Continue Reading

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Apr 9, 2017·Analytical and Bioanalytical Chemistry·Teresa Mairinger, Stephan Hann
Apr 15, 2018·Analytical and Bioanalytical Chemistry·Teresa MairingerStephan Hann
Nov 23, 2018·Nature Communications·Özge AtaDiethard Mattanovich

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Citations

Apr 4, 2021·Metabolites·Evelyn RamplerGunda Koellensperger
May 29, 2021·Current Opinion in Biotechnology·Tomasz K BednarskiJamey D Young
Sep 10, 2021·Rapid Communications in Mass Spectrometry : RCM·Patrizia LeograndeFrancesco Botrè

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