DExSI: A new tool for the rapid quantitation of 13C-labelled metabolites detected by GC-MS.

Summary Stable isotope directed metabolomics is increasingly being used to measure metabolic fluxes in microbial, plant and animal cells. Incorporation of 13C/15N isotopes into a wide range of metabolites is typically determined using gas chromatography-mass spectrometry (GC/MS) or other hyphenated mass spectrometry approaches. The DExSI pipeline is an interactive graphical software package which can be used to rapidly quantitate isotopologues for a wide variety of metabolites detected by GC/MS. DExSI performs automated metabolite annotation, mass and positional isotopomer abundance determination and natural isotope abundance correction. It provides a range of output options and is suitable for high throughput analyses. Availability DExSI is available for non-commercial use from Using the password: NewDExSI2017 for Microsoft Windows 7 or higher (64-bit). Contact [email protected] or [email protected]. Supplementary information Supplementary data are available at Bioinformatics online.