%0 Journal Article
%T Italian and Argentine olive oils: a NMR and gas chromatographic study
%A Mannina
%A Luisa
%A Fontanazza
%A Giuseppe
%A Patumi
%A Maurizio
%A Ansanelli
%A Giuliana
%J Grasas y Aceites
%D 2001
%I Consejo Superior de Investigaciones Cient¨ªficas
%X High-field Nuclear Magnetic Resonance (NMR) spectroscopy and Gas Chromatography (GC) were used to analyze 16 monovarietal olive oils obtained from few matched Mediterranean cultivars grown in experimental fields located in Italy and in the Catamarca region of Argentina. The Catamarca region is characterized by extreme pedoclimatic conditions and by a wild spontaneous vegetation. The proposed sampling allows to study the effect of different pedoclimatic conditions on olive oil composition. GC gives the fatty acid profile of olive oil samples. 1H and 13C NMR techniques provide different information: the 1H NMR spectrum allows the measurement of minor components of olive oils such as b-sytosterol, hexanal, trans-2-hexenal, formaldehyde, squalene, cycloartenol and linolenic acid; the 1C NMR spectrum allows to obtain information about glycerol tri-esters of olive oils, i.e., about their acyl composition and positional distribution on glycerol moiety. All the NMR and GC results have been submitted to Linear Discriminant Analysis (LDA) and Tree Cluster Analysis (TCA). A careful analysis of the statistical results allows to select the Mediterranean cultivars less affected by the climatic conditions present in the Catamarca region. The selected cultivars produce olive oils which keep their Mediterranean characteristics and which can be proposed as colonizing plants in this wild Argentine region. La espectroscop¨ªa de Resonancia Magn¨¦tica Nuclear de alta resoluci¨®n (RMN) y Cromatograf¨ªa Gaseosa (CG) fueron utilizadas para analizar 16 monovariedades de aceites de oliva, obtenidas de algunos olivares Mediterr¨¢neos cultivados contempor¨¢neamente en campos experimentales localizados en Italia y en la regi¨®n de Catamarca en Argentina. Estas muestras permiten estudiar diferentes condiciones pedoclim¨¢ticas en la composici¨®n de los aceite de oliva. La CG proporciona el perfil en ¨¢cidos grasos de los aceites de oliva y las t¨¦cnicas RMN 1H y RMN 13C suministran diferentes informaciones: el espectro RMN 1H permite medir los componentes menores del aceite de oliva tales como b-sitoesterol, hexanol, trans - 2 hexanol, formaldehido, escualeno, cicloartenol y ¨¢cido linol¨¦nico y el espectro RMN 13C da informaci¨®n referente a los tri¨¦steres de glicerol de los aceites de oliva, por ejemplo, la composici¨®n y distribuci¨®n de la posici¨®n ac¨ªlica en el glicerol. Los datos de CG y RMN han sido sometidos a un an¨¢lisis discriminante lineal (LDA) y a un an¨¢lisis cluster en ¨¢rbol (TCA). Un minucioso an¨¢lisis de estos resultados ha permitido seleccionar olivares que han sido menos afectados p
%K Gas-chromatography
%K NMR
%K Olive oil
%K Statistical analysis
%K Aceite de oliva
%K An¨¢lisis estad¨ªstico
%K Cromatograf¨ªa gaseosa
%K NMR
%U http://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/348/350