Common edible oils are mostly vegetable oils, including rapeseed oil, peanut oil, sesame oil, corn oil, olive oil, camellia oil, palm oil, sunflower oil, soybean oil, sesame oil, linseed oil (linseed oil), grape seed oil, walnut oil and peony seed oil.
Cooking oil has the function of heat transfer, which can make dishes appear tender or crisp. In the cooking process, grease is widely used as a heat transfer medium. Because of the high ignition point of oil, heating can accelerate the cooking speed, shorten the cooking time of food and keep the raw materials fresh and tender. Proper control of heating time and oil temperature can also make dishes crisp and crisp, so it is often used for cooking.
Extended data
Improper storage of edible oil may lead to oxidative deterioration.
For the convenience of use, many people are used to putting oil in a small oil pan or next to a cooker. Zhang Ziping, chief expert of China Meat Association, pointed out that oxidation will lead to fat decomposition and rancidity in edible oil. Cooking oil should be stored in a sealed place away from light, and some fine powder of vitamin E can be sprinkled on the oil surface to delay oxidation and deterioration.
According to the study on the effect of light on the acid value of walnut oil, the peroxide value of walnut oil increased with time under different light conditions. The stability order of walnut oil under different illumination is: avoiding light > ultraviolet light > natural light > fluorescent light.
Therefore, edible vegetable oil can't be placed in heat and light for a long time, and information such as storage away from light is usually marked on the wall label of edible oil drums. Zhang Guifeng reminded that at present, many edible oils in the domestic market are packaged in large capacity of more than 4 liters, which is not conducive to the control of dosage and quantity during use, nor to the control of oxidation during storage.
Baidu encyclopedia-edible oil
People's Daily Online-Cooking oil: One oil in the end hurts the body.