Why does pressed peanut oil need to be refined?
The crude peanut oil pressed by the oil press generally needs to be further refined.The main component of the crude peanut oil after pressing by the oil press is a mixture of glycerol tri-fatty acids (commonly known as neutral oil); it also contains non-glycerin substances, collectively referred to as impurities. According to the dispersion state of impurities in the oil,It can be roughly classified into four categories.
1. Suspended impurities: including sediment, flakes, flour and other solid impurities. The presence of these impurities is conducive to microbial activities, making oil easy to hydrolyze and rancid, and cannot be eaten.
2. Peptic impurities: including phospholipids, proteins, sugars, etc., the main ones are phospholipids. The presence of these impurities not only makes the oil hydrolyzed and rancid, the appearance is turbid and dim, but also produces a lot of foam and black precipitate during cooking; seriously affects the color and flavor of stir-fried vegetables and fried foods, and at the same time loses the nutritional value of the oil itself, and also has the necessary toxicity.
3. Oil-soluble impurities: including free fatty acids, pigments, hydrocarbon waxes, aldehydes, ketones, etc., as well as trace metals and organic phosphorus, mercury, polycyclic aromatic hydrocarbons, aflatoxins, etc. caused by environmental pollution. The presence of these impurities is very harmful to the human body, and some impurities also have carcinogenic effects on the human body.
For aflatoxins, due to the presence of certain moldy oils, the aflatoxins in the crude oil can be greatly exceeded. For example, peanut oil is easily contaminated by aflatoxins, and its aflatoxin content sometimes reaches 1000-10000ug/ kg.
Aflatoxin is a highly toxic substance with a higher toxicity than potassium cyanide. It is a strong chemical carcinogen currently found. The carcinogenicity is 900 times that of Butter Yellow and 75 times greater than the ability of dimethyl nitrite to induce liver cancer. After humans eat foods contaminated with aflatoxin, the incidence of liver cancer increases. Many aflatoxins can synergize with hepatitis B virus to induce liver cancer. Aflatoxin is heat-resistant, and it is not easily destroyed at the temperature of general cooking and processing, and it will be cracked when it is higher than 280 degrees Celsius. Aflatoxin can be adsorbed by saponins, activated bleaching earth,activated carbon, etc., and degraded by ultraviolet light of the required wavelength. It can also be destroyed in high temperature treatments such as deodorization. Therefore, the oil can be refined to remove this toxin. China stipulates that the content of aflatoxin in general edible oil is less than 10ug/kg, and that in peanut oil is less than 20ug/kg.
4. Moisture: The crude oil contains a lot of moisture, and the presence of moisture can easily make the oil hydrolyzed and rancid.
To sum up, there are too many impurities in the peanut oil pressed by the oil press, which affects the texture of the oil, so it needs to be refined by to remove the impurities in the peanut crude oil one by one. The oil after refined has a transparent color, Long-term storage, no precipitation, no frothing and oil fume in the pot, reaching the national edible oil standard.
1. Suspended impurities: including sediment, flakes, flour and other solid impurities. The presence of these impurities is conducive to microbial activities, making oil easy to hydrolyze and rancid, and cannot be eaten.
2. Peptic impurities: including phospholipids, proteins, sugars, etc., the main ones are phospholipids. The presence of these impurities not only makes the oil hydrolyzed and rancid, the appearance is turbid and dim, but also produces a lot of foam and black precipitate during cooking; seriously affects the color and flavor of stir-fried vegetables and fried foods, and at the same time loses the nutritional value of the oil itself, and also has the necessary toxicity.
3. Oil-soluble impurities: including free fatty acids, pigments, hydrocarbon waxes, aldehydes, ketones, etc., as well as trace metals and organic phosphorus, mercury, polycyclic aromatic hydrocarbons, aflatoxins, etc. caused by environmental pollution. The presence of these impurities is very harmful to the human body, and some impurities also have carcinogenic effects on the human body.
For aflatoxins, due to the presence of certain moldy oils, the aflatoxins in the crude oil can be greatly exceeded. For example, peanut oil is easily contaminated by aflatoxins, and its aflatoxin content sometimes reaches 1000-10000ug/ kg.
Aflatoxin is a highly toxic substance with a higher toxicity than potassium cyanide. It is a strong chemical carcinogen currently found. The carcinogenicity is 900 times that of Butter Yellow and 75 times greater than the ability of dimethyl nitrite to induce liver cancer. After humans eat foods contaminated with aflatoxin, the incidence of liver cancer increases. Many aflatoxins can synergize with hepatitis B virus to induce liver cancer. Aflatoxin is heat-resistant, and it is not easily destroyed at the temperature of general cooking and processing, and it will be cracked when it is higher than 280 degrees Celsius. Aflatoxin can be adsorbed by saponins, activated bleaching earth,activated carbon, etc., and degraded by ultraviolet light of the required wavelength. It can also be destroyed in high temperature treatments such as deodorization. Therefore, the oil can be refined to remove this toxin. China stipulates that the content of aflatoxin in general edible oil is less than 10ug/kg, and that in peanut oil is less than 20ug/kg.
4. Moisture: The crude oil contains a lot of moisture, and the presence of moisture can easily make the oil hydrolyzed and rancid.
To sum up, there are too many impurities in the peanut oil pressed by the oil press, which affects the texture of the oil, so it needs to be refined by to remove the impurities in the peanut crude oil one by one. The oil after refined has a transparent color, Long-term storage, no precipitation, no frothing and oil fume in the pot, reaching the national edible oil standard.
For more detailed information of peanut oil refining equipment, please refer to the website https://www.victoryoilmachinery.com/Oil_Refining_Machine/
Henan victor Machinery welcomes your consultation.
Henan victor Machinery welcomes your consultation.
