Thermally induced isomerization of linoleic acid and α-linolenic acid in Tratt seed oil.

seed oil is obtained from the seeds left following pressing of the juice from fruit. The total oil content of seed was around 9.30%. The fatty acid profile of the oil was determined by gas chromatography (GC). Among the 11 fatty acids identified in the oil, seven were unsaturated fatty acids (UFAs) (92.6%); four were saturated fatty acids (SFAs) (7.17%). Then, the kinetics of formation of -fatty acids was studied by GC. Heat treatment of seed oil showed an increase in the relative percentage of linoleic acid and α-linolenic acid isomers with increasing temperature and time. The formation of linoleic acid and α-linolenic acid isomers followed a zero-order reaction. The presence of O enhanced the isomerization of these UFAs. In addition, the rate constants and activation energies for the geometrical isomerization of UFAs in seed oil were presented. Overall, seed oil contains high UFA contents. Heating temperature and duration and the presence of O should be considered to reduce the formation of -fatty acids during thermal treatment of seed oil.