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The influence of experimental parameters on quantitative deuterium measurements for ethyl alcohols of different origin
Author(s) -
Ciepielowski Grzegorz,
PacholczykSienicka Barbara,
Klajman Kamila,
Paneth Piotr,
Albrecht Łukasz
Publication year - 2020
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.10191
Subject(s) - deuterium , spectrometer , chemistry , mass spectrometry , analytical chemistry (journal) , hydrogen , fractionation , deuterium nmr , isotope , chromatography , nuclear physics , optics , physics , organic chemistry
BACKGROUND Quantitative determination with site‐specific natural isotope fractionation nuclear magnetic resonance (SNIF‐NMR) has been exploited widely in detecting adulteration and for the classification of natural products by their geographical origin. RESULTS We compared isotopic parameters such as deuterium / hydrogen (D/H) site specific ratios and the R parameter for alcoholic beverages, obtained using (i) a 500 MHz spectrometer equipped with a dedicated probe for isotopic measurements, and (ii) a 700 MHz spectrometer equipped with a standard probe. The factors affecting the accuracy and precision of quantitative NMR with the second instrument have been explored. CONCLUSIONS It has been demonstrated that, in laboratories with a spectrometer that is not equipped with a specific deuterium probe, the selection of the appropriate experimental parameters enables measurements with a similar precision and accuracy as in the case of the official method adopted by the International Organisation of Vine and Wine. © 2019 Society of Chemical Industry