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Comparing gas chromatography with time-of-flight, quadrupole time-of-flight and quadrupole mass spectrometry for stable isotope tracing (part-I)

ABSTRACT: Stable isotope tracers are applied in vivo and in vitro studies to reveal the activity of enzymes and intracellular metabolic pathways. Most often, such tracers are used with gas chromatography coupled to mass spectrometry (GC-MS) due to its ease of operation and reproducible mass spectral databases. Differences in isotope tracer performance of classic GC-quadrupole MS instrument and newer time-of-flight instruments are not well-studied. Here, we used three commercially available instruments for the analysis of identical samples from a stable isotope labeling study that used [U-13C6] d-glucose to investigate the metabolism of Rothia mucilaginosa with respect to 29 amino acids and hydroxyl acids involved in primary metabolism. Overall, all three GC-MS instruments (low-resolution GC-SQ-MS, low-resolution GC-TOF-MS, and high-resolution GC-Q-TOF-MS) can be used to perform stable isotope tracing studies for glycolytic intermediates, TCA metabolites and amino acids, yielding similar biological results, with high-resolution GC-Q-TOF-MS offering additional capabilities to identify chemical structures of unknown compounds that might show significant isotope enrichments in biological studies.

ORGANISM(S): Rothia Mucilaginosa Rothia

TISSUE(S): Bacterial Cells

SUBMITTER: Ying Zhang

PROVIDER: ST001608 | MetabolomicsWorkbench | Thu Nov 19 00:00:00 GMT 2020

REPOSITORIES: MetabolomicsWorkbench

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Comparing gas chromatography with time-of-flight, quadrupole time-of-light and quadrupole mass spectrometry for stable isotope tracing (part-II)

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