Journal
FOOD CHEMISTRY
Volume 118, Issue 4, Pages 890-900Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2008.05.115
Keywords
Orange juice; Isotopes; delta H-2; delta C-13; delta N-15; delta S-34; Sr-87/Sr-86; Geographical origin; Authentication; Adulteration
Funding
- European Union
- Schutzgerneinschaft der Fruchtsaftindustrie (SGF)
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Within the EU-project Pure Juice established stable isotope methods (delta H-2, delta C-13, delta N-15) have been applied and improved in order to determine and verify the geographical origin of orange juices. In addition, new approaches employing analyses of delta S-34 and Sr-87/Sr-86 have been developed and tested. Approximately 150 authentic orange juice samples from several regions in North- and South-America, Africa and Europe have been analysed. A discrimination of orange producing regions, based on the results which ultimately depend on geographical, climatic and lithological differences was successfully performed. Furthermore, we demonstrate that blending of single strength juice by adding concentrate can be revealed by comparing Sr-87/Sr-86 of soluble and insoluble components of the juices. We conclude that regional assignment of orange juice samples is most successful when single parameters are combined in a multi-element approach. (C) 2008 Elsevier Ltd. All rights reserved.
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