The results of vitamin E decomposition on heating oil was found that the first sampling of oil
sample start at 210 ºC. Vitamin E was reduced approximately 6.38% compare with the amount of
vitamin E before heated. The heating oil sample still collected continuity every 15 minutes until
reach to constant temperature (278 ºC). At this temperature, the sample was further collected for 3
times (15 minutes/each). The decay rate of vitamin E increased rapidly up to 60.70% at the highest
temperature (278 ºC) and the decay rate of vitamin E did not significantly increase after expansion
of heated time (Table 2). Fig. 1 shows the vitamin E concentration at various heating temperature
and sampling time. This result illustrated that oil heated to 278 ºC is not sufficient to completely
decompose vitamin E. From the previous research, thermal decomposition of vitamin E in edible
oil was completely at about 773 K (500 ºC) (Arora, Bagoria, and Kumar, 2010). It can be noticed
that the heating temperature is a more significant factor than the heating time. Generally, the most
of food cooking needs high heat, which influences the breakdown of vitamin E during the cooking