vegetable oil
Vegetable oil contains unsaturated fatty acids, has low melting point, is liquid at room temperature, and has high digestion and absorption rate. The fat content of vegetable oil is above 99%, and it is also rich in vitamin E, a small amount of potassium, sodium, calcium and trace elements.
Vegetable oil is an important source of essential fatty acids. In order to meet the needs of the human body, it should not be less than 50% of the total fat source in the diet. Vegetable oil is not suitable for long-term storage because it contains more unsaturated fatty acids, which are easy to rancid and produce some substances harmful to human body.
animal fat
Oil obtained from animals.
Can be divided into terrestrial warm-blooded animals and poultry oils, such as butter, sheep oil, lard and so on. , generally solid, its main components are triglycerides of palmitic acid and stearic acid; Oils and fats of marine mammals and fish, such as whale oil and fish oil, are usually liquids. Besides myristic acid, palmitic acid, stearic acid and oleic acid, there are unsaturated acids with 22-24 carbons and 4-6 double bonds and unsaturated acids with 65,438+00-65,438+04 carbons.
Mainly food, such as pig fat, cow fat, sheep fat and so on. It is also widely used to make hardened oil, soap, glycerin, lubricating oil, leather industry and medicine. Fish oil is the raw material for preparing coatings. To obtain by boiling.
The oils of terrestrial animals are mainly concentrated in adipose tissues and internal organs, such as pig fat, cow fat and sheep fat. It also exists in the milk of mammals in emulsified state, such as milk fat. There is also a small amount in bone marrow, such as bone oil. Fatty acids that make up triglycerides are mainly oleic acid, palmitic acid and stearic acid. Among them, the composition of saturated acid is generally more than vegetable oil. Fish oil mostly exists in the liver, such as cod liver oil. Most of the oil of marine animals exists under the skin, such as dolphin oil.