title: Oxygen-18 measurement of Andalusian olive oils by continuous flow pyrolysis/isotope ratio mass spectrometry.
abstract: We report a method for the determination of delta(18)O isotopic abundance in olive oils. The results obtained by applying the method to various Andalusian oil samples obtained in the 2004/05 and 2005/06 seasons are discussed in relation to olive variety, geographical origin, climate and ripeness index. Application of the method to samples of assured varietal purity exposed the influence of olive variety and origin but not of the ripeness index. The delta(18)O values for the 2005/06 season are higher on average than those obtained in the colder 2004/05 season. Results obtained for samples of the Picual and Hojiblanca varieties in Córdoba and Málaga in the 2005/06 season suggest a correlation between enrichment in heavy isotopes and latitude whereas no clear-cut effect of altitude was observed.
authors.affiliation: Department of Organic Chemistry, University of Córdoba, Campus de Rabanales, Marie Curie Building, E-14014 Córdoba, Spain.
authors.forename: María A
authors.initials: MA
authors.lastname: Aramendía
authors.forename: Alberto
authors.initials: A
authors.lastname: Marinas
authors.forename: José M
authors.initials: JM
authors.lastname: Marinas
authors.forename: José M
authors.initials: JM
authors.lastname: Moreno
authors.forename: Mustafa
authors.initials: M
authors.lastname: Moalem
authors.forename: Luis
authors.initials: L
authors.lastname: Rallo
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Urbano
mesh_terms: D006361:Heating; D007553:Isotope Labeling; D000069463:Olive Oil; D010103:Oxygen Isotopes / Q000032:analysis*; D010938:Plant Oils / Q000737:chemistry* / Q000145:classification; D015203:Reproducibility of Results; D013030:Spain; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D000069463:Olive Oil; D010103:Oxygen Isotopes; D010938:Plant Oils