title: Authentication of virgin olive oil by a novel curve resolution approach combined with visible spectroscopy.
abstract: Adulteration of olive oil is not only a major economic fraud but can also have major health implications for consumers. In this study, a combination of visible spectroscopy with a novel multivariate curve resolution method (CR), principal component analysis (PCA) and linear discriminant analysis (LDA) is proposed for the authentication of virgin olive oil (VOO) samples. VOOs are well-known products with the typical properties of a two-component system due to the two main groups of compounds that contribute to the visible spectra (chlorophylls and carotenoids). Application of the proposed CR method to VOO samples provided the two pure-component spectra for the aforementioned families of compounds. A correlation study of the real spectra and the resolved component spectra was carried out for different types of oil samples (n=118). LDA using the correlation coefficients as variables to discriminate samples allowed the authentication of 95% of virgin olive oil samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, IVAGRO, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain. Electronic address: marta.ferreiro@uca.es.
authors.forename: Marta
authors.initials: M
authors.lastname: Ferreiro-González
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, IVAGRO, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain.
authors.forename: Gerardo F
authors.initials: GF
authors.lastname: Barbero
authors.affiliation: Department of Physical Chemistry, Faculty of Sciences, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain.
authors.forename: José A
authors.initials: JA
authors.lastname: Álvarez
authors.affiliation: Department of Physical Chemistry, Faculty of Sciences, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Ruiz
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, IVAGRO, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: Palma
authors.affiliation: Department of Physical Chemistry, Faculty of Sciences, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: Ayuso
mesh_terms: D002734:Chlorophyll; D016002:Discriminant Analysis; D000069463:Olive Oil / Q000737:chemistry*; D025341:Principal Component Analysis; D013057:Spectrum Analysis
chemical_list: D000069463:Olive Oil; D002734:Chlorophyll
keywords: Authentication; Curve resolution; Linear discriminant analysis; Pomace oil; Virgin olive oil; Visible spectroscopy