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GasBench/isotope ratio mass spectrometry: a carbon isotope approach to detect exogenous CO 2 in sparkling drinks
Author(s) -
Cabañero Ana I.,
SanHipólito Tamar,
Rupérez Mercedes
Publication year - 2007
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3212
Subject(s) - chemistry , isotope ratio mass spectrometry , wine , mass spectrometry , isotope analysis , isotopes of carbon , fractionation , isotope , stable isotope ratio , chromatography , analytical chemistry (journal) , environmental chemistry , total organic carbon , food science , geology , oceanography , physics , quantum mechanics
A new procedure for the determination of carbon dioxide (CO 2 ) 13 C/ 12 C isotope ratios, using direct injection into a GasBench/isotope ratio mass spectrometry (GasBench/IRMS) system, has been developed to improve isotopic methods devoted to the study of the authenticity of sparkling drinks. Thirty‐nine commercial sparkling drink samples from various origins were analyzed. Values of δ 13 C cava ranged from −20.30‰ to −23.63‰, when C3 sugar addition was performed for a second alcoholic fermentation. Values of δ 13 C water ranged from −5.59‰ to −6.87‰ in the case of naturally carbonated water or water fortified with gas from the spring, and δ 13 C water ranged from −29.36‰ to −42.09‰ when industrial CO 2 was added. It has been demonstrated that the addition of C4 sugar to semi‐sparkling wine (aguja) and industrial CO 2 addition to sparkling wine (cava) or water can be detected. The new procedure has advantages over existing methods in terms of analysis time and sample treatment. In addition, it is the first isotopic method developed that allows 13 C/ 12 C determination directly from a liquid sample without previous CO 2 extraction. No significant isotopic fractionation was observed nor any influence by secondary compounds present in the liquid phase. Copyright © 2007 John Wiley & Sons, Ltd.