title: Characterization and Discrimination of Oueslati Virgin Olive Oils from Adult and Young Trees in Different Ripening Stages Using Sterols, Pigments, and Alcohols in Tandem with Chemometrics.
abstract: Dynamics of squalene, sterol, aliphatic alcohol, pigment, and triterpenic diol accumulations in olive oils from adult and young trees of the Oueslati cultivar were studied for two consecutive years, 2013-2014 and 2014-2015. Data were compared statistically for differences by age of trees, maturation of olive, and year of harvesting. Results showed that the mean campesterol content in olive oil from adult trees at the green stage of maturation was significantly (p < 0.02) above the limit established by IOC legislation. However, the mean values of campesterol and Δ-7-stigmastenol were significantly (p < 0.01) above the limits in oils from young trees at the black stage of ripening. Principal component analysis was applied to alcohols, squalene, pigments, and sterols having noncompliance with the legislation. Then, data of 36 samples were subjected to a discriminant analysis with "maturation" as grouping variable and principal components as input variables. The model revealed clear discrimination of each tree age/maturation stage group.
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole National d'Ingénieur de Sfax, Université de Sfax , B.P. 1173, 3038 Sfax, Tunisia.|Institut de l'olivier à Sfax, Unité Technologie et Qualité de l'huile d'olive , 3029 Sfax, Tunisia.
authors.forename: Fatma
authors.initials: F
authors.lastname: Chtourou
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole National d'Ingénieur de Sfax, Université de Sfax , B.P. 1173, 3038 Sfax, Tunisia.
authors.forename: Hazem
authors.initials: H
authors.lastname: Jabeur
authors.affiliation: Institut de l'olivier à Sfax, Unité Technologie et Qualité de l'huile d'olive , 3029 Sfax, Tunisia.
authors.forename: Ayda
authors.initials: A
authors.lastname: Lazzez
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole National d'Ingénieur de Sfax, Université de Sfax , B.P. 1173, 3038 Sfax, Tunisia.|Institut Supérieur de Biotechnologie de Sfax, Université de Sfax , B.P. 1175, 3038 Sfax, Tunisia.
authors.forename: Mohamed
authors.identifier: http://orcid.org/0000-0001-9107-7027
authors.initials: M
authors.lastname: Bouaziz
mesh_terms: D000438:Alcohols / Q000032:analysis*; D003116:Color; D016002:Discriminant Analysis; D031658:Olea / Q000737:chemistry* / Q000254:growth & development; D000069463:Olive Oil / Q000737:chemistry*; D010860:Pigments, Biological / Q000032:analysis*; D013261:Sterols / Q000032:analysis*; D014197:Trees / Q000737:chemistry / Q000254:growth & development
chemical_list: D000438:Alcohols; D000069463:Olive Oil; D010860:Pigments, Biological; D013261:Sterols
keywords: adult and young trees; alcohols; discriminant analysis; squalene; sterols