METHOD FOR DETERMINATION OF DELTA-D VALUES OF NON- EXCHANGEABLE HYDROGEN STABLE ISOTOPES ON ETHANOL' S METHYL GROUP BY MEANS OF IRMS INSTRUMENTAL TECHNIQUE
The present innovation is related with chemical instrumental analysis, i.e. to the domain of analysis of stable isotopes in food products, and it is related to the method for preparation of ethanol samples and mode for determination of isotopic ratio of non- exchangeable hydrogen stable isotopes sited on the methyl site of ethanol by means of instrumental technique CF - TC/EA - IRMS (Continuous Flow - Temperature Conversion/Elemental Analyzer - Isotope Ratio Mass Spectrometry), and for the purpose of establishing authenticity and geographical origin of wine and grape must, beer, alcoholic beverages, fruit juices, honey, vinegars and other food products which contain alcohol and /or fermentable sugars. This method is based on full enzymatic (or organic) transformation of ethanol samples to gain ethanoic acid (acetic acid), controlled neutralization of acetic acid and further concentration, purification of prepared acetate salt and its drying to the constant mass and further determination of dD values in prepared samples by means of CF-TC/EA- IRMS.
