The sample is burned for isotope ratio analysis. The various isotope ratios are determined on the gases/ash (for metals) produced in the process after they have been separated using isotope ratio mass spectrometry (IRMS). This method provides global measurement data of the sample, especially in the form of multi-element isotope analysis. Deuterium nuclear magnetic resonance spectrometry (2H-NMR) provides hydrogen isotope patterns for certain chemical substances (flavorings, synthesis compounds), which contain particularly detailed information about their (bio)syntheses. 13C patterns of individual food substances (ethanol, glycerol, ascorbic acid, malic acid) contain additional important information and can be obtained by breaking down the substances.
