Abstract
Two promising isotope ratios, the δ18O of the water fraction, as extracted by azeotropic distillation, and the 87Sr/86Sr of the ash fraction were tested for their applicability to determine the geographic origin. In two sampling phases, in total 78 fresh poultry breast meat and 72 dried beef samples, independent from each other and originating from different countries, were analysed. The δ18O was measured with isotope ratio mass spectrometry and the isotope abundance ratio of 87Sr/86Sr with a multicollector inductively coupled plasma mass spectrometer. With δ18O it was possible to distinguish (p < 0.001) poultry and dried beef samples according to their country of origin. The beef data suggests that the procedure of processing is of only low additional influence on δ18O and, if so, it seems to reduce the initial between-country differences. The 87Sr/86Sr ratio did not give sufficient indications for differentiation by geographic origin in either poultry meat or dried beef in the smaller, first phase, data set and was therefore not further tested.
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Acknowledgments
We are grateful to Bell AG, Bischofberger AG, Fredag AG and Micarna SA, who provided the poultry samples as well as to Albert Spiess AG, Cher-Mignon SA, Metzgerei Beat Eggs, Fleischtrocknerei Churwalden AG, Gabriel Fleury SA, Handl Tyrol GmbH, Natura Bündner Fleischtrocknerei, Rapelli SA and Surselva Fleischwaren AG, who provided the European and Australian dried beef samples. We want to thank the Swiss embassies in the USA and Canada who helped to organize the US and Canadian dried beef samples, Jürg Wüthrich, formerly EMPA St. Gallen, CH, for his help in analysing the Sr isotopes, and the Swiss Federal Office of Public Health for the financial support.
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Franke, B.M., Koslitz, S., Micaux, F. et al. Tracing the geographic origin of poultry meat and dried beef with oxygen and strontium isotope ratios. Eur Food Res Technol 226, 761–769 (2008). https://doi.org/10.1007/s00217-007-0588-x
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DOI: https://doi.org/10.1007/s00217-007-0588-x