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• W2912121921 abstract "Targeted tandem mass spectrometry (LC–MS/MS) has been extremely useful for profiling small molecules extracted from biological sources, such as cells, bodily fluids and tissues. Here, we present a protocol for analysing incorporation of the non-radioactive stable isotopes carbon-13 (13C) and nitrogen-15 (15N) into polar metabolites in central carbon metabolism and related pathways. Our platform utilizes selected reaction monitoring (SRM) with polarity switching and amide hydrophilic interaction liquid chromatography (HILIC) to capture transitions for carbon and nitrogen incorporation into selected metabolites using a hybrid triple quadrupole (QQQ) mass spectrometer. This protocol represents an extension of a previously published protocol for targeted metabolomics of unlabeled species and has been used extensively in tracing the metabolism of nutrients such as 13C-labeled glucose, 13C-glutamine and 15N-glutamine in a variety of biological settings (e.g., cell culture experiments and in vivo mouse labelling via i.p. injection). SRM signals are integrated to produce an array of peak areas for each labelling form that serve as the output for further analysis. The processed data are then used to obtain the degree and distribution of labelling of the targeted molecules (termed fluxomics). Each method can be customized on the basis of known unlabeled Q1/Q3 SRM transitions and adjusted to account for the corresponding 13C or 15N incorporation. The entire procedure takes ~6–7 h for a single sample from experimental labelling and metabolite extraction to peak integration. This protocol describes the analysis of stable isotope (13C and 15N) incorporation into polar metabolites in central carbon metabolic pathways using HILIC separation and selected reaction monitoring with a hybrid triple quadrupole mass spectrometer." @default.
• W2912121921 created "2019-02-21" @default.
• W2912121921 creator A5027755683 @default.
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• W2912121921 date "2019-01-25" @default.
• W2912121921 modified "2023-10-16" @default.
• W2912121921 title "Ex vivo and in vivo stable isotope labelling of central carbon metabolism and related pathways with analysis by LC–MS/MS" @default.
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• W2912121921 doi "https://doi.org/10.1038/s41596-018-0102-x" @default.
• W2912121921 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7382369" @default.
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• W2912121921 hasPublicationYear "2019" @default.
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