Luminescence spectral properties and chromatography of linseed oils with different storage periods

The paper focuses on luminescence spectral properties of linseed oils obtained by the cold pressing method with different storage periods.We noted the high value of oil fluorophores (phenols, tocopherols, polyunsaturated fatty acids, vitamins, pigments) in conveying information about their original state depending on the time of oil storage in household conditions.It has been established that long-term storage of oil (more then 2 years) leads to: a) oxidation and decay of phenols, tocopherols, polyunsaturated fatty acids (linoleic, linolenic, arachidonic), vitamins (B2, E), carotene (precursor of vitamin A), chlorophyll pigment, accompanied by a decrease in the intensity of the luminescence bands of phenol, tocopherol, and chlorophyll pigment;b) an increase in the intensity of the luminescence bands of the oxidation products of these components peaking at max= 370, 390, 415, 430, 470, 515, 568 and 590 nm with a change in the structure of the luminescence excitation spectra of these fluorophores.The fatty acid composition of linseed oils was determined by using the gas chromatography method, using a 7890 B gas chromatograph (Agilent Technologies), equipped with a zb-FAME capillary column (manufactured by Phenomenex, USA), 20 m long, internal diameter 0.18 mm, phase thickness 0.15 m.Helium was used as the carrier gas.