title: The use of IRMS, (1)H NMR and chemical analysis to characterise Italian and imported Tunisian olive oils.
abstract: Isotope Ratio Mass Spectrometry (IRMS), (1)H Nuclear Magnetic Resonance ((1)H 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 δ(18)O, δ(2)H, linoleic acid, saturated fatty acids β-sitosterol, sn-1 and 3 diglyceride values. Furthermore, all the Tunisian samples imported were of poor quality, with a K232 and/or acidity values above the limits established for extra virgin olive oils. By combining isotopic composition with (1)H 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%.
authors.affiliation: Fondazione Edmund Mach (FEM), Via E. Mach 1, I-38010 San Michele all'Adige, Italy. Electronic address: federica.camin@fmach.it.
authors.forename: Federica
authors.initials: F
authors.lastname: Camin
authors.affiliation: Istituto di Metodologie Chimiche, Laboratorio di Risonanza Magnetica "Annalaura Segre", CNR, I-00015 Monterotondo, Rome, Italy.
authors.forename: Anita
authors.initials: A
authors.lastname: Pavone
authors.affiliation: Fondazione Edmund Mach (FEM), Via E. Mach 1, I-38010 San Michele all'Adige, Italy.
authors.forename: Luana
authors.initials: L
authors.lastname: Bontempo
authors.affiliation: Fondazione Edmund Mach (FEM), Via E. Mach 1, I-38010 San Michele all'Adige, Italy.
authors.forename: Ron
authors.initials: R
authors.lastname: Wehrens
authors.affiliation: Fondazione Edmund Mach (FEM), Via E. Mach 1, I-38010 San Michele all'Adige, Italy.
authors.forename: Mauro
authors.initials: M
authors.lastname: Paolini
authors.affiliation: Ministero delle Politiche Agricole, Alimentari e Forestali, ICQRF DG PREF Ufficio PREF V e Laboratorio centrale di Roma, Via Del Fornetto 85, I-00149 Rome, Italy.
authors.forename: Angelo
authors.initials: A
authors.lastname: Faberi
authors.affiliation: Ministero delle Politiche Agricole, Alimentari e Forestali, ICQRF DG PREF Ufficio PREF V e Laboratorio centrale di Roma, Via Del Fornetto 85, I-00149 Rome, Italy.
authors.forename: Rosa Maria
authors.initials: RM
authors.lastname: Marianella
authors.affiliation: Istituto di Metodologie Chimiche, Laboratorio di Risonanza Magnetica "Annalaura Segre", CNR, I-00015 Monterotondo, Rome, Italy.
authors.forename: Donatella
authors.initials: D
authors.lastname: Capitani
authors.affiliation: Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Vista
authors.affiliation: Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy; Istituto di Metodologie Chimiche, Laboratorio di Risonanza Magnetica "Annalaura Segre", CNR, I-00015 Monterotondo, Rome, Italy.
authors.forename: Luisa
authors.initials: L
authors.lastname: Mannina
mesh_terms: D007558:Italy; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods; D000069463:Olive Oil / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D014416:Tunisia
chemical_list: D000069463:Olive Oil; D010938:Plant Oils
keywords: Geographical origin; Metabolite profiling; Olive oil; Quality; Stable isotope ratios of C, H and O