Grasas y Aceites, Vol 69, No 2 (2018)

Chemical and structural variations in hazelnut and soybean oils after ozone treatments


https://doi.org/10.3989/gya.1098171

H. Uzun
Gaziantep University, Department of Food Engineering, Turkey
orcid http://orcid.org/0000-0003-1098-3197

E. G. Kaynak
Gaziantep University, Department of Food Engineering, Turkey
orcid http://orcid.org/0000-0003-1805-1984

E. Ibanoglu
Gaziantep University, Department of Food Engineering, Turkey
orcid http://orcid.org/0000-0003-2665-7919

S. Ibanoglu
Gaziantep University, Department of Food Engineering, Turkey
orcid http://orcid.org/0000-0002-0727-4747

Abstract


In the present work, the effect of ozone treatments on the structural properties of soybean oil (SBO) and hazelnut oil (HO) were investigated. The study presents the findings and results about the oxidation of HO and SBO with ozone, which has not been fully studied previously. The HO and SBO were treated with ozone gas for 1, 5, 15, 30, 60, 180 and 360 min. The ozone reactivity with the SBO and HO during the ozone treatment was analyzed by 1H, 13C NMR, FTIR and GC. The iodine value, viscosity and color variables (L*, a* and b*) of untreated and ozone treated oils were determined. Reaction products were identified according to the Criegee mechanism. New signals at 5.15 and 104.35 ppm were assigned to the ring protons of 1,2,4- trioxolane (secondary ozonide) in the ozonated oils in 1H and 13C NMR, respectively. Ozonated oils exhibited peaks at 9.75 and 2.43 ppm in 1H and NMR, which corresponded to the aldehydic proton and α-methylene group and to the carbonyl carbon, respectively. The peak at 43.9 ppm in 13C NMR was related to the α-methylene group and to the carbonyl carbon. The new signals formed in the ozonation process gradually increased with respect to ozone treatment time. After 360 min of ozone treatment, the carbon-carbon double bond signal, which belongs to the unsaturated fatty acids, disappeared completely in the spectrum. An increase in viscosity, a decrease in iodine value and a dramatic reduction in b* of the oil samples on (+) axis were observed with increased ozone treatment time.

Keywords


FTIR; GC; Hazelnut oil; NMR; Ozone; Soybean oil; Viscosity

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