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MetabolomicsPositional Enrichment by Proton Analysis (PEPA): a One-Dimensional 1H-NMR Approach for 13C Stable Isotope Tracer Studies in Metabolomics
A novel metabolomics approach for NMR-based stable isotope tracer studies called PEPA is presented, and its performance validated using human cancer cells. PEPA detects the position of carbon label in isotopically enriched metabolites and quantifies fractional enrichment by indirect determination of...
2017-02-23 | MTBLS247 | MetaboLights
MetabolomicsUntargeted extraction of metabolites 13C labeling profiles from time course labeling switch experiment
Dynamic isotope labeling data provide crucial information about the operation of metabolic pathways, and are commonly generated via liquid chromatography mass spectrometry (LC-MS). Metabolome-wide analysis is challenging as it requires grouping of metabolite features over different samples. We devel...
2015-10-19 | MTBLS229 | MetaboLights
MetabolomicsUntargeted extraction of metabolites 13C labeling profiles from time course labeling switch experiment
Dynamic isotope labeling data provide crucial information about the operation of metabolic pathways, and are commonly generated via liquid chromatography mass spectrometry (LC-MS). Metabolome-wide analysis is challenging as it requires grouping of metabolite features over different samples. We devel...
2015-10-19 | MTBLS228 | MetaboLights
Metabolomics13C metabolomics reveals widespread change in carbon fate during coral bleaching
INTRODUCTION: Rising seawater temperatures are threatening the persistence of coral reefs; where above critical thresholds, thermal stress results in a breakdown of the coral-dinoflagellate symbiosis and the loss of algal symbionts (coral bleaching). As symbiont-derived organic products typically fo...
2018-12-04 | MTBLS538 | MetaboLights
MetabolomicsGlobal 13C tracing and metabolic flux analysis of intact human liver tissue ex vivo
Liver metabolism is central to human physiology and influences the pathogenesis of common metabolic diseases. Yet, our understanding of human liver metabolism remains incomplete, with much of current knowledge based on animal or cell culture models that do not fully recapitulate human physiology. He...
2024-07-23 | MTBLS10481 | MetaboLights
MetabolomicsIsotope tracing-based metabolite identification for mass spectrometry metabolomics

Modern mass spectrometry-based metabolomics is a key technology for biomedicine, enabling discovery and quantification of a wide array of biomolecules critical for human physiology. Yet, only a fraction of human metabolites have been structurally determined, and the majority of features in typica...

2025-08-15 | MTBLS12861 | MetaboLights
MetabolomicsA Comprehensive and Ultrasensitive Isotope Calibration Method for Soil Amino Compounds Using Orbitrap Mass Spectrometry
Bound amino compounds (amino acid and amino sugar polymers) comprise a significant proportion (~40%) of soil organic nitrogen and therefore represent an essential source of nitrogen for plant and microbial nutrition. The analysis of their content and isotope enrichment still represents a significant...
2025-06-16 | MTBLS12550 | MetaboLights
MetabolomicsIsotopomer analysis of MCF-7 breast cancer cell line incubated with 13C labelled glucose (GC-MS assay)
MS and NMR are two of the most powerful spectroscopic techniques used in the field of fluxomics, to analyze the flux distributions in cellular metabolomic pathways. Both of them possess pros and cons, such as, MS being the most sensitive and low-cost technique, while needs extensive sample processin...
2018-05-02 | MTBLS182 | MetaboLights
MetabolomicsStable isotope-resolved metabolomics of WT, GYG1 KO, and GYG2 KO human embryonic stem cells using 13C-labeled glucose and palmitate
Proper regulation of glycogen metabolism is fundamental to cellular energy homeostasis, and its disruption is associated with various metabolic disorders, including glycogen storage diseases (GSDs) and potentially diabetes. Despite glycogen’s role as an essential energy reservoir, the mechanisms gov...
2025-07-15 | MTBLS12586 | MetaboLights
Metabolomics13C-glucose tracing analysis of IFN-treated A549 cells expressing wild-type SARS-CoV-2 Nsp3-4 or a deISGylation-defective Nsp3-4 mutant protein

Interferon (IFN)-stimulated gene 15 (ISG15) regulates diverse cellular processes, including antiviral immunity, through its conjugation to target proteins (ISGylation). Increasing evidence suggests that ISGylation can also reshape cellular metabolism; however, how viruses counteract ISGylation-me...

2026-05-05 | MTBLS14030 | MetaboLights
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