title: Authentication and traceability of Italian extra-virgin olive oils by means of stable isotopes techniques.
abstract: Authentication of food origin is relevant to avoid food fraud. This work aimed to explore the variation of isotopic compositions (δ(13)C, δ(18)O) of extra-virgin olive oils from Italy growing in different environmental conditions. A total of 387 oil samples from nine different regions (from North to South), produced on 2009, 2010 and 2011, were analysed. Statistical analysis showed correlations among oil isotope compositions and latitude, mean annual temperature, mean annual precipitation and xerothermic index. No correlation was found comparing isotope compositions with elevation and longitude. An observed shift of the oil δ(18)O per centigrade degree of the mean annual temperature is congruent with literature. The year effect was significant for both δ(18)O and δ(13)C. Samples from Sicilia and Sardegna were higher in (13)C and (18)O than oils from northern regions.
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto di Biologia Agroambientale e Forestale, 05010 Porano (TR), Italy. Electronic address: silvia.portarena@ibaf.cnr.it.
authors.forename: S
authors.initials: S
authors.lastname: Portarena
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto di Biologia Agroambientale e Forestale, 05010 Porano (TR), Italy.
authors.forename: O
authors.initials: O
authors.lastname: Gavrichkova
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto di Biologia Agroambientale e Forestale, 05010 Porano (TR), Italy.
authors.forename: M
authors.initials: M
authors.lastname: Lauteri
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto di Biologia Agroambientale e Forestale, 05010 Porano (TR), Italy.
authors.forename: E
authors.initials: E
authors.lastname: Brugnoli
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis*; D007558:Italy; D000069463:Olive Oil / Q000737:chemistry* / Q000145:classification; D010103:Oxygen Isotopes / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D000069463:Olive Oil; D010103:Oxygen Isotopes
keywords: Climatic parameters; Geographical origin; Isotopes; Olive oil; δ(13)C; δ(18)O