EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
introduction | walnut, also known as walnut and Qiang peach, is an important woody oil tree species. it is rich in resources and varieties in our country, and its cultivation area and yield rank first in the world. In 2015, the total output of walnut in China was 3.33 million t, ranking first among woody oil. Walnut kernel has an oil content of 60% ~ 75%, of which unsaturated fatty acids account for more than 90%. It is known as the "king of oil in plants" and has various health care effects such as preventing cardiovascular diseases. Walnut oil has the functions of strengthening the body, beautifying the face, strengthening the brain and nourishing the brain, preventing cardiovascular and cerebrovascular diseases, supplementing calcium for the skeletal system, strengthening the brain and improving intelligence in children's health, promoting the development of the brain and nervous system, and promoting Calcium absorption helps bone development and protects gastrointestinal balance metabolism. |
ingredients and efficacy | 1. the total amount of unsaturated fatty acids such as linoleic acid and linolenic acid in walnut oil is as high as about 90%, among which the contents of linoleic acid and α-linolenic acid are 47.4% and 15.8% respectively, which are all essential fatty acids for human body. Linoleic acid is an omega -6 series of essential fatty acids for the human body. It is the main raw material for the synthesis of arachidonic acid and the main substance for the human body to synthesize prostaglandins. It has the effect of preventing thrombosis and dilating blood vessels. Linoleic acid can reduce low-density lipoprotein and increase high-density lipoprotein. Low-density lipoprotein is easy to precipitate cholesterol and deposit on the blood vessel wall, causing blood vessel thickening and decreased elasticity, causing diseases such as coronary heart disease, stroke and aneurysm. High-density lipoprotein is not only not easy to precipitate cholesterol, but also can remove cholesterol deposited on the blood vessel wall., Send back to the liver to decompose. α-linolenic acid is an omega -3 series of fatty acids. Many oils do not contain or only contain trace amounts. The content of α-linolenic acid in walnut oil is significantly higher than that of common vegetable oils. 2. phospholipid content in phospholipid walnut oil is 0.02% ~ 0.03%. Phospholipids are essential components that make up the brain and nerve cells. After the phospholipids in food enter the human body, they can be hydrolyzed into choline and converted into acetylcholine with the blood entering the brain and the acetic acid in the brain. The higher the content of acetylcholine, the faster the information transmission speed between brain nerve cells, which helps to improve memory and intelligence. The lack of phospholipids and acetylcholine will weaken the connection between brain cells and lead to the decline of thinking and memory ability. |
efficacy and action | linoleic acid can effectively reduce the blood cholesterol content of human body, increase the content of high density lipoprotein cholesterol (HDL-C), prevent the accumulation of lipids on the blood vessel wall, prevent atherosclerosis, and improve the function of blood vessel wall. The oil content in walnut kernel is as high as 60% ~ 70%. The content of unsaturated fatty acids such as linoleic acid, linolenic acid and oleic acid in walnut oil is as high as 90%, which has high nutritional and medicinal value. Walnut oil contains calcium, zinc, potassium and other minerals, which are helpful for the development of baby's bones and teeth. linolenic acid and linoleic acid can promote the development of liver and kidney, thus ensuring black and shiny hair. Walnut oil is rich in vitamin A and linolenic acid, which is beneficial to the development of retina and prevents night blindness and vision loss. The rich phospholipids in walnut oil have the functions of enhancing cell activity, promoting hematopoiesis, making skin smooth and delicate, accelerating wound healing and hair growth, and protecting cranial nerves. Walnut oil is also rich in vitamin E, which plays an important role in scavenging free radicals, softening blood vessels, preventing the formation of lipofuscin pigment, slowing down the production of "brown spots" and delaying aging. |
efficacy | 1. walnut oil has the effect of strengthening the body: this is because walnuts can provide sufficient calories. According to data estimates, every 100 grams of walnut kernel can provide about 630 kilocalories, which is equivalent to 3-4 times the calories of rice. Therefore, eating walnuts often in winter can also protect against the cold. 2. Walnut oil has the effect of moisturizing skin: Walnut oil is rich in dogfish with excellent affinity with skin and essential fatty acids for human body. It absorbs quickly and effectively maintains skin elasticity and moisturization. 3. Walnut oil has the function of beauty and beauty: this is because walnut oil is rich in essential fatty acids, and also rich in a kind of shark with strong affinity with skin. These two substances can be quickly absorbed by the quilt skin, which can effectively protect the elasticity of the skin; it can eliminate facial wrinkles and prevent skin aging. 4. Walnut oil has the function of beautiful hair care: eating more walnut oil can promote children's hair to turn black. 5. Walnut oil has the effect of strengthening the brain and nourishing the brain: Walnut oil does not contain cholesterol, which can effectively prevent the occurrence of Alzheimer's disease; rich linoleic acid and linolenic acid can eliminate intravascular metabolism Impurities purify the blood and provide fresh blood for the brain. 6. Walnut oil has the effect of preventing cardiovascular and cerebrovascular diseases: Walnut oil can prevent arteriosclerosis and arteriosclerosis complications, hypertension, heart disease, heart failure, renal failure, and cerebral hemorrhage. 7. Walnut oil can improve the function of endocrine system: this is because dha in walnut oil can increase the sensitivity of insulin. when the content of unsaturated fatty acids in cells is higher, the more healthy the number is, the stronger its activity will be. 8. the effect of walnut oil on calcium supplement of bone system: the natural antioxidants and omega -3 fatty acids in walnut oil help the body absorb minerals such as calcium, phosphorus, zinc, etc., which can promote bone growth and maintain bone density. |
Nutritional ingredients | 1, omega (ω)-3 fatty acid:(a-linolenic acid) linolenic acid or LNA, is one of the materials that make up the brain. Linoleic acid accounts for 20% of the brain weight together, and can be derived into DHA (brain gold) in the body. Linolenic acid has the function of improving eyesight and lowering lipid, and also plays an important role in regulating attention and cognitive process. Linolenic acid is very important for the soundness of the fetal brain, retina, skin and kidney function. Long-term lack of linolenic acid will affect attention and cognitive development. From the fetal period of 26 weeks to two years after birth, it is the most important stage of human brain and retina development. Since the mother is the main provider of nutrition for the fetus and baby, mothers during pregnancy and lactation should pay special attention to the intake of linolenic acid. For artificially fed babies, there are also many formulas added with walnut oil (such as Newberry) that can supplement linolenic acid needed for infant brain and vision development. linolenic acid is very important for growth and development. Among common vegetable oils, walnut oil has the highest content of omega -3(a-linolenic acid). 2. omega (ω)-6 fatty acid (linoleic acid): linoleic acid is also called "beauty acid" or LA. one of single cells and fatty acids is unsaturated fatty acids that the human body cannot synthesize by itself but must be ingested from food. Linoleic acid can promote skin development and nutrition, and is also beneficial to healthy hair. Common vegetable oils, such as corn oil, safflower oil, cottonseed oil, sunflower oil, are rich in omega -6 (linoleic acid). 3. Folic acid: is a kind of vitamin B family. It is an indispensable nutrient in the cell manufacturing process. It is extremely important for nutrition and health during pregnancy, especially in early pregnancy. Because folic acid can affect the development of the fetal brain and spinal cord, insufficient intake will lead to fetal neural tube defects (such as spina bifida). Sufficient intake of folic acid in early pregnancy can effectively reduce the occurrence of neural tube defects. Folic acid is also a substance necessary for the formation of red blood cells. The body's requirement for folic acid during pregnancy is also greatly increased due to the rapid proliferation of red blood cells. Folic acid deficiency will lead to anemia, increase the probability of abortion, the baby may also be malnourished. Dark green vegetables, beans, fresh fruits, milk with folic acid, and grains with folic acid are all excellent sources of folic acid. However, folic acid is easily destroyed during cooking. It is recommended that you try raw or slightly cooked vegetables. 4. natural vitamin e: is a strong and effective free radical scavenger. 70% of vitamin e in daily diet comes from edible oil. Natural vitamin E plays an important role in eliminating lipid peroxides in cell membranes, softening blood vessels and delaying aging. Vitamin E for men can improve the quality, quantity and activity of sperm. Women who lack vitamin E are prone to miscarriage. Vitamin E can reduce the body's need for oxygen and prevent brain damage in fetuses and newborn babies. Athletes or climbers are more adaptable to thin air after taking vitamin E. Since infancy, taking vitamin E every day can cure congenital heart disease. When vitamin E is deficient, it can cause nephritis. Lack of vitamin E can lead to anemia, vitamin E can treat scars, vitamin E can prevent varicose veins, vitamin E can enhance the detoxification function of the liver. |
extraction process | pressing method the principle of pressing oil is to extract oil from oil by mechanical force. It is divided into hydraulic pressure method and screw press method. Judging from the current data, there are more studies on the spiral pressing method of oil production, and relatively few reports on the hydraulic method of oil production. This is due to a series of shortcomings in the hydraulic method, such as relatively high residual oil rate, Low production capacity, high labor intensity, and long pressing time. The hydraulic method has been gradually replaced by a continuous screw press. Wang Fengjun and others studied the method of cold pressing walnut oil in the laboratory to avoid high-temperature treatment such as steaming and frying, and maximize the retention of physiologically active substances ". Although the crushing method has the disadvantages of high residual oil rate of cake, large loss of cake and oil, and large power consumption, the oil-making method is simple and flexible, and has strong adaptability, so this method is still applied to many varieties and small batches of oil processing. In addition, walnut oil produced by pressing method has unique flavor and no solvent residue. It can be used to produce flavor walnut oil and is a green food loved by consumers. Microwave-assisted extraction Microwave technology is a new oil extraction technology. Microwave is a high-frequency electromagnetic wave. It is comprehensively evaluated from the energy consumption ratio of materials and equipment components, heat energy conversion efficiency, total heating time and other aspects. Microwave technology is more effective than far infrared, steam heating and other technologies. Many studies have also shown that microwave extraction can significantly improve the extraction rate of non-volatile and low-volatile components. For example, for the extraction of gossypol, only half of the amount of conventional solvent is required, and the extraction can be completed within tens of minutes. (5) supercritical CO2 fluid extraction technology is a new type of separation technology. It avoids the problems of organic solvent extraction, easy oxidation rancidity of oil and oil, and residual organic solvent. It also avoids the disadvantages of unsatisfactory oil color, complicated refining process and low output after using the pressing method. Therefore, more and more people choose supercritical CO2 fluid method to extract walnut oil ". |