Stable isotope investigations are widely used to trace and understand biological or industrial processes. The Isotopic & Organic Platform carries out innovative developments using stable isotopes measurements (2H/1H, 13C/12C, 15N/14N and 18O/16O) in different research programs with industrials and/or academic organisms. Analyzes are performed on gases (CO2, N2, H2, CO) using Isotope Ratio Mass Spectrometers (IRMS) by Bulk Stable Isotope Analysis (BSIA) or Compound Specific Isotope Analysis (CSIA). By BSIA, samples are previously turned into gas by combustion or pyrolysis reaction using an elemental analyzer linked to IRMS (EA-C/P-IRMS). By CSIA, targeted molecules are separated on Gas Chromatography or Liquid Chromatography prior to the combustion/ pyrolysis or oxidation process and the isotopic determination is done on the IRMS (GC-C/P-IRMS, LC-IRMS) The main application fields are : natural products authenticity assessment, biobased content (determination of the biomass content), environmental or eco