Journal
FOOD CHEMISTRY
Volume 196, Issue -, Pages 98-105Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.08.132
Keywords
Olive oil; Geographical origin; Quality; Metabolite profiling; Stable isotope ratios of C, H and O
Funding
- Italian Ministry of Agriculture, Food and Forestry within the context of the 'Protocollo d'Intesa tra il Ministero delle Politiche Agricole e Forestali e la Fondazione Edmund Mach-Istituto Agrario di San Michele all'Adige'
- State Forestry Service - Food and Agriculture Safety division
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Isotope Ratio Mass Spectrometry (IRMS), H-1 Nuclear Magnetic Resonance (H-1 NMR), conventional chemical analysis and chemometric elaboration were used to assess quality and to define and confirm the geographical origin of 177 Italian PDO (Protected Denomination of Origin) olive oils and 86 samples imported from Tunisia. Italian olive oils were richer in squalene and unsaturated fatty acids, whereas Tunisian olive oils showed higher delta O-18, delta H-2, linoleic acid, saturated fatty acids beta-sitosterol, sn-1 and 3 diglyceride values. Furthermore, all the Tunisian samples imported were of poor quality, with a K-232 and/or acidity values above the limits established for extra virgin olive oils. By combining isotopic composition with H-1 NMR data using a multivariate statistical approach, a statistical model able to discriminate olive oil from Italy and those imported from Tunisia was obtained, with an optimal differentiation ability arriving at around 98%. (C) 2015 Elsevier Ltd. All rights reserved.
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