Chinese name: linoleic acid
English name: linoleic acid
Definition: Scientific name: 18:1Δ9c,12c. An unsaturated fatty acid with 18 carbon atoms and 2 double bonds. Widely distributed in plant oils and fats, essential for mammalian nutrition.
Linoleic acid is a fatty acid. The molecular formula is CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH. Its scientific name is cis-9,12-octadecadienoic acid. Linoleic acid, together with other fatty acids, exists in the form of glycerides in animal and vegetable oils and fats.
The content in animal fat is generally low, such as 1.8% in butter and 6% in lard; the content in some vegetable oils is higher, such as 26% in peanut oil, 57.5% in soybean oil, and 15.8% in rapeseed oil. Linoleic acid is a colorless oily liquid. Melting point -5℃, the melting point data introduced in the chemical version of "Practical Chemistry Handbook" is -9.5℃, boiling point 229～230℃ (2.13KPa), relative density 0.9022 (20/4℃). Insoluble in water, soluble in organic solvents such as ether and chloroform. It is easy to self-oxidize in the air. When treated with selenium at 200℃ or with nitrogen oxides, it is converted into trans-linoleic acid. When hydrogenated, it first becomes 12-octadecenoic acid and oleic acid, and further hydrogenated into stearic acid. Linoleic acid is an essential fatty acid in human and animal nutrition. The sodium or potassium salt of linoleic acid is one of the components of soap and can be used as a surfactant such as an emulsifier. In medicine, it can be used to treat hyperlipidemia and arteriosclerosis. Its aluminum salt can be used to make paints and coatings.
Linoleic acid is a fatty acid that cannot be synthesized by the human body, or the amount synthesized is far from meeting the needs. It is called an essential fatty acid. Linoleic acid is recognized as the only essential fatty acid. Linoleic acid has received much attention because it can lower blood cholesterol and prevent atherosclerosis. Studies have found that cholesterol must be combined with linoleic acid to be able to function and metabolize normally in the body. If linoleic acid is lacking, cholesterol will combine with some saturated fatty acids, causing metabolic disorders, and will be deposited on the blood vessel wall, gradually forming atherosclerosis and causing cardiovascular and cerebrovascular diseases.
Linoleic acid CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH, a type of fatty acid. It is the main component of drying oils and semi-drying oils such as linseed oil and cottonseed oil in the form of glyceride. It accounts for 40-60% of the total fatty acids in walnut oil, cottonseed oil, sunflower seed oil, and sesame oil, and about 25% of the total fatty acids in walnut oil, peanut oil, and olive oil. Because it is easily oxidized and hardened in the air, it is also called drying acid, and oils containing more drying acid are also called drying oils.
It is recommended to eat more walnut oil, soybean oil, etc.
The main purpose:
Linoleic acid has the effects of lowering blood lipids, softening blood vessels, lowering blood pressure, and promoting microcirculation. It can prevent or reduce the incidence of cardiovascular diseases, especially for the prevention and treatment of hypertension, hyperlipidemia, angina pectoris, coronary heart disease, atherosclerosis, and senile obesity. It is extremely beneficial. It can prevent the deposition of human serum cholesterol in the blood vessel walls and has the reputation of "blood vessel scavenger". It has the health care effect of preventing and treating atherosclerosis and cardiovascular diseases.