Determination of 13C/12C Isotope Ratio in Alcohols of Different Origin by 1н Nuclei NMR-Spectroscopy

• Published in: Russian physics journal 2017, Vol.59 (10), p.1710-1714
• Main Authors: Dzhimak, S. S., Basov, A. A., Buzko, V. Yu, Kopytov, G. F., Kashaev, D. V., Shashkov, D. I., Shlapakov, M. S., Baryshev, M. G.
• Format: Article
• Language: English
• Subjects: Alcohol; Alcoholic beverages; Carbon 12; Condensed Matter Physics; Ethanol; Hadrons; Heavy Ions; Isotope ratios; Isotopes; Lasers; Mathematical and Computational Physics; Methylene; NMR; Nuclear magnetic resonance; Nuclear Physics; Nuclei; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Physics of Magnetic Phenomena; Protons; Satellites; Spectrum analysis; Theoretical
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-017-0965-2

A new express method of indirect assessment of 13 C/ 12 C isotope ratio on 1 H nuclei is developed to verify the authenticity of ethanol origin in alcohol-water-based fluids and assess the facts of various alcoholic beverages falsification. It is established that in water-based alcohol-containing systems, side satellites for the signals of ethanol methyl and methylene protons in the NMR spectra on 1 H nuclei, correspond to the protons associated with 13 C nuclei. There is a direct correlation between the intensities of the signals of ethanol methyl and methylene protons’ 1 H- NMR and their side satellites, therefore, the data obtained can be used to assess 13 C/ 12 C isotope ratio in water-based alcohol-containing systems. The analysis of integrated intensities of main and satellite signals of methyl and methylene protons of ethanol obtained by NMR on 1 H nuclei makes it possible to differentiate between ethanol of synthetic and natural origin. Furthermore, the method proposed made it possible to differentiate between wheat and corn ethanol.