Under normal storage conditions, peanut oil will undergo an auto-oxidation and rancidity process, and its changes are as follows: the auto-oxidation process is related to the season. If it is stored in winter, low temperature can effectively delay the reaction of lipase and oxygen. With the change of seasons and the rise of temperature, when the temperature is between 15-30℃, on Den ene hånd på grund af lipasens virkning hydrolyseres olien, og syreværdien øges . På den anden side vil infiltrationen af ilt i luften fremme oxidationen af olie til dannelse af hydroperoxider .
In summer, the room temperature and the tank temperature exceed 30℃. If it is stored in an open-air oil tank or an open-air yard, it will be exposed to sunlight every day. In this case, environmental factors will accelerate the oxidation process of oil. Especially in the sunlight, under the action of ultraviolet rays or metal catalysts, when the radiation temperature overstiger 50 grader, peroxider og hydroperoxider vil yderligere nedbrydes og omarrangerer molekyler til aldehyder og ketoner, hvilket gør den lagrede olie -harsk .
