20.500.12556/RUL-128309 Dielectric properties and dipole moment of edible oils subjected to ʼfryingʼ thermal treatment The dielectric properties of six refined edible oils with different fatty-acid compositions were determined for oils incubated at 180 °C up to 40 h. The oil degradation was evaluated by the dielectric dispersion and dielectric loss in the frequency range from 40 Hz to 2 MHz at 25 °C, refractive index, density, saponification number, and specific absorption coefficient at 232 and 268 nm. The dependence of the dielectric properties on frequency has been evaluated with Corach, Cole–Cole, and the universal power law models, giving the novel strategies for the interpretation of the dielectric spectra of thermally treated oils. The derived parameters—the dielectric constant, the electrical conductivity, the relaxation time τ and the exponents α, p, and n—are discussed with respect to the increased oxidation evidenced by specific absorption coefficients and polar products, as measured by the dielectric constant of the thermally treated oils. The specific refraction, specific polarization, orientation polarization, and dipole moment were determined using Lorenz–Lorentz, Debye and Onsager relationship. All above parameters obtained increased during the thermal treatment, except specific refraction, the electrical conductivity and the relaxation time. The dielectric constant-macroscopic parameter was compared with microscopic parameter polarization and dipole moment; the linear dependence was found to be R$^2$ = 0.971. edible oils dielectric constant electrical conductivity dipole moment polarization refraction jedilna olja toplotna obdelava električna prevodnost dielektrične lastnosti dipolni moment true false true Angleški jezik Slovenski jezik Članek v reviji 2021-07-08 09:10:27 2021-07-08 09:10:28 2022-09-07 04:14:20 0000-00-00 00:00:00 2020 0 0 17 str. iss. 7, art. 900 Vol. 9 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.623:664.34 2304-8158 10.3390/foods9070900 22479875 RAZ_Segatin_Natasa_2020.pdf RAZ_Segatin_Natasa_2020.pdf 1 785517DFE52BFDAA58DA14B7E8D55EA5 c7ac52a3b8e2acad20fc3f5b92c0c3b92f028220a1946fd30609beecf317bc2f 9725e143-dfbb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145002 https://www.mdpi.com/2304-8158/9/7/900 1 703db720-dfbb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145001 Biotehniška fakulteta 0 0 0