Peanut oil is light yellow, transparent, clear in color, fragrant and delicious, and it is an easy-to-digest edible oil. Peanut oil contains more than 80% unsaturated fatty acids (including oleic acid 4 1.2% and linoleic acid 37.6%). In addition, it also contains 19.9% saturated fatty acids such as palmitic acid, stearic acid and arachidic acid. Peanut oil has a good fatty acid composition and is easily digested and absorbed by the human body. According to foreign data, the use of peanut oil can decompose cholesterol in human body into bile acid and excrete it, thus reducing the cholesterol content in plasma. In addition, peanut oil also contains sterols, wheat germ phenol, phospholipids, vitamin E, choline and other substances beneficial to the human body. Regular consumption of peanut oil can prevent skin wrinkles and aging, protect blood vessel walls, prevent thrombosis, and help prevent arteriosclerosis and coronary heart disease. Choline in peanut oil can also improve the memory of human brain and delay the decline of brain function.
storage characteristics
Under general storage conditions, peanut oil will undergo the process of automatic oxidation rancidity, and the changes are as follows: the automatic oxidation process is related to the season. If stored in winter, low temperature can effectively alleviate the style of lipase and oxygen. With the change of seasons and the increase of temperature, when the temperature is 15-30℃, on the one hand, oil will be hydrolyzed by lipolytic enzymes, and the acid value will increase, on the other hand, oxygen in the air will be immersed.
When the room temperature and storage tank temperature exceed 30℃ in summer, it will be exposed to sunlight every day if it is stored in an open-air oil tank or an open-air storage yard. In this case, environmental factors will accelerate the oxidation process of oil. Especially in the sun, under the action of ultraviolet rays or metal catalysts, when the radiation temperature exceeds 50℃, peroxides and hydroperoxides will be further decomposed and then rearranged into aldehydes and ketones, which will make the stored oil rancid.