Czech J. Food Sci., 2008, 26(5):368-375 | DOI: 10.17221/1610-CJFS

Assessment of the authenticity of fruit spirits by gas chromatography and stable isotope ratio analyses

Renata WINTEROVÁ¹, Renata MIKULÍKOVÁ², Jiří MAZÁČ³, Pavel HAVELEC³

¹ Food Research Institute Prague, Prague, Czech Republic

² Research Institute of Brewing and Malting, Brno

³ Customs Technical Laboratory, Prague, Czech Republic

The gas chromatographic (GC) determination of volatile constituents and the determination of ¹³C/¹²C isotope ratios by isotope ratio mass spectrometry - IRMS analysis as well as SNIF-NMR analysis of (D/H)I and (D/H)II ratios in ethanol are prospective analytical methods which can be used for checking the authenticity of fruit spirits and for detecting their adulteration. Different concentrations of volatile compounds such as acetaldehyde, ethyl acetate, diethyl acetal, methanol, 1-butanol, 2-butanol, 1-propanol, 2-methyl-1-propanol, 2- and 3-methyl-1-butanol, volatile fatty acids and isotopic data were demonstrated using discriminant analysis. The results show that the determination of isotope ratios can be used especially for distinguishing between fruit spirits and others spirits, i.e. those made from beet sugar, maize, cane sugar, grain, potato, or synthetic alcohol. Gas chromatography also makes it possible to discriminate between respective spirits derived from one kind of fruit such as sweet cherry brandy, sour cherry brandy, pear brandy, apple brandy, apricot brandy, or plum brandy.

Keywords: authenticity; fruit spirits; gas chromatography; stable isotope ratio analysis; IRMS; SNIF-NMR; linear discriminant analysis

Published: October 31, 2008  Show citation