Journal
FOOD CHEMISTRY
Volume 276, Issue -, Pages 782-789Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.10.077
Keywords
Olive oil; Geographical origin; C, H and O stable isotopes; Fatty acids
Funding
- European Union [613688]
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European law requires a designation of origin for virgin and extra virgin olive oils (at least in terms of EU/nonEU provenance). Stable isotope ratios have been successfully applied to determine the geographical origin of olive oils, but never to distinguish EU and non-EU oils. In this study H-2/H-1, C-13/C-12 and O-18/O-16 ratios were analysed in bulk olive oils using Isotope Ratio Mass Spectrometry (IRMS) as well as C-13/C-12 and H-2/H-1 in the four main fatty acids (linoleic, oleic, palmitic and stearic acids) using IRMS coupled with GC. The isotopic composition of olive oils was successfully used to distinguish samples originating in the two areas. Specifically, when bulk data were combined with fatty acid isotopic data the differentiation power of the method improved clearly. This separation is due to the specific isotopic fingerprint of the individual countries making up the EU and non-EU samples.
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