Abstract
It has been found that the dissolved water (141560 ppm) in safflower oil promoted the autoxidation of the oil in air at 20 and 50°C during the long time storage (45014, 000h).
When those oils were stored for 450h at 20 and 50°C, there was no difference in the degree of the autoxidation of the oil dissolved the water (141560 ppm).
During the long time (100014000 h), the oil contained 14 ppm H2O was little autoxidized owing to the formation of the hydrogen bond among the dissolved water and the hydroperoxide and peroxy group (HPO and PO group). At the same conditions, the autoxidation of the oils contained 2201560 ppm H2O was accelerated by the dissolved free water.
In case of the equal amount of the dissolved water in these oils at 20 and 50°C, a plot of the POV (peroxide value) vs. the equivalent number of the HPO and PO group Per the mole aumber of the dissolved water gave one straight line. Therefore, when safflower oils containing water were stored at 20 and 50°C for the long time, it is thought that the mechanism of the action of the dissolved water in these oils an the autoxidation are identical.
