Strontium and oxygen isotope fingerprinting of green coffee beans and its potential to proof authenticity of coffee
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Multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) and Isotope Ratio Mass Spectrometry (IRMS) were applied to combine strontium and oxygen isotope abundance ratios of green coffees from 20 geographical origins in order to evaluate the suitability of these parameters as indicators of geographical origin, which is an important parameter of coffee quality. Results show that both isotopic systems of green coffee beans show a relation to environmental factors that influence processes occurring during the growth of the coffee bean. The final results allowed discrimination of local provenances investigated in this study by principal component analysis (PCA) and exhibit the potential to proof authenticity of world coffees. A good discrimination was obtained especially for coffee of South America region and coffees originating from islands.
KeywordsCoffee authenticity Geographical origin Isotopes analysis ICP-MS IRMS
The authors wish to thank Novadelta, Comércio e Indústria de Cafés, S.A., Campo Maior, Portugal for supplying green bean coffee samples and geographic location information. Rodrigo Maia, Marion Brunner, Johanna Irrgeher and Stefanie Schweigkofler are acknowledged for technical support of the sample preparation and measurement. Carla Rodrigues wishes to thank Fundação para a Ciência e a Tecnologia for a grant (SFRH/BD/28354/2006). Financial support by the Austrian Science Foundation (FWF START grant 267 N11) is highly acknowledged. This work was financed by the project PTDC/AGR-AAM/104357/2008 (IsoGeoCoffee).
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