title: Correlation of basic oil quality indices and electrical properties of model vegetable oil systems.
abstract: Model vegetable oil mixtures with significantly different basic oil quality indices (free fatty acid, iodine, and Totox values) were prepared by adding oleic acids, synthetic saturated triglycerides, or oxidized safflower oil ( Carthamus tinctorius ) to the oleic type of sunflower oil. Dielectric constants, dielectric loss factors, quality factors, and electrical conductivities of model lipids were determined at frequencies from 50 Hz to 2 MHz and at temperatures from 293.15 to 323.15 K. The dependence of these dielectric parameters on basic oil quality indices was investigated. Adding oleic acids to sunflower oil resulted in lower dielectric constants and conductivities and higher quality factors. Reduced iodine values resulted in increased dielectric constants and quality factors and decreased conductivities. Higher Totox values resulted in higher dielectric constants and conductivities at high frequencies and lower quality factors. Dielectric constants decreased linearly with temperature, whereas conductivities followed the Arrhenius law.
authors.affiliation: Biotechnical Faculty, University of Ljubljana , Ljubljana, Slovenia.
authors.forename: Tjaša
authors.initials: T
authors.lastname: Prevc
authors.forename: Blaž
authors.initials: B
authors.lastname: Cigić
authors.forename: Rajko
authors.initials: R
authors.lastname: Vidrih
authors.forename: Nataša
authors.initials: N
authors.lastname: Poklar Ulrih
authors.forename: Nataša
authors.initials: N
authors.lastname: Šegatin
mesh_terms: D000814:Aniline Compounds / Q000032:analysis; D004553:Electric Conductivity; D004560:Electricity; D005230:Fatty Acids, Nonesterified / Q000032:analysis; D063427:Food Quality; D007455:Iodine / Q000032:analysis; D019301:Oleic Acid / Q000737:chemistry; D010938:Plant Oils / Q000032:analysis / Q000737:chemistry*; D000074242:Sunflower Oil; D014280:Triglycerides / Q000737:chemistry; D014675:Vegetables
chemical_list: D000814:Aniline Compounds; D005230:Fatty Acids, Nonesterified; D010938:Plant Oils; D000074242:Sunflower Oil; D014280:Triglycerides; D019301:Oleic Acid; C013813:4-anisidine; D007455:Iodine