Effect of automatic frying machine on oil

Rancidity is one of the reasons for the deterioration of oil-bearing products, because it is spontaneous, so it is not easy to completely prevent it. The physical and chemical constants of rancid oil have changed, such as the relative density, refractive index, soap value and acid value have increased, while the iodine value tends to decrease. Enzyme, sunlight, microorganism, oxygen, temperature and metal ions can accelerate rancidity, and hydrolysis is also the main factor to promote rancidity. Therefore, frying used oil can shorten the shelf life.