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Characterisation and attempted differentiation of European and extra-European olive oils using stable isotope ratio analysis.

Food Chemistry 2019 March 16
European law requires a designation of origin for virgin and extra virgin olive oils (at least in terms of EU/non-EU 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 2 H/1 H, 13 C/12 C and 18 O/16 O ratios were analysed in bulk olive oils using Isotope Ratio Mass Spectrometry (IRMS) as well as 13 C/12 C and 2 H/1 H 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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