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What are the hazards of oil oxidation, and what factors will affect the oxidation rate of oil?

September 09, 2021

Oil oxidation is an important factor that affects the quality of edible oil, and oil oxidation is also called fatty acid failure. After the fat is decomposed, free fatty acids are generated. Fatty acids are divided into "saturated fatty acids" and "unsaturated fatty acids". Under the action of light, oxygen, etc., unsaturated fatty acids are more likely to slowly oxidize and generate hydroperoxides. Hydroperoxides are broken down into low-molecular aldehydes, ketones, acids and other products with a hala taste. This process is called the oxidation rancidity of fats.

edible oil

Oxidative rancidity greatly reduces the quality of refined edible oil. Eating severely oxidized rancid oil can cause damage to the human digestive system, liver, kidney, heart, etc., leading to vomiting and diarrhea. In severe cases, it can even induce tumors and cause cancer. Or death. The main reasons for the accelerated oil oxidation rate are the following factors.

1. The oxidation rate of high unsaturated fatty acid content is accelerated, and the oxidation rate of cis-double bond fatty acid and conjugated double bond fatty acid is accelerated.

2. The higher the free fatty acid content, the faster the oxidation rate of oil.

3. The contact area of ​​grease and air or oxygen is large, and the oxidation rate of grease is accelerated.

4. As the temperature increases, the oxidation rate of grease accelerates.

5. The irradiation of visible light, invisible light, etc. will cause the oxidation rate of grease to increase.

6. Excessive water content causes hydrolysis and rancidity of oils, which leads to oxidation.

7. Oxygen-promoting metal ions, lipoxygenase, etc. are easy to cause the oxidation of oil.

Impurities such as phospholipids, free fatty acids, and pigments in oils can be removed during the production process through refining equipment, such as degumming, deacidification, decolorization, and deodorization. Refining equipment can improve the quality of oils, extend the storage time of oils, and reduce oils. Oxidative rancidity caused by impurities is also the reason why edible oil in supermarkets can be stored for a long time without deterioration. However, even if it is refined oil, please pay attention to the storage environment after opening, reduce contact with air, and avoid the oxidation and rancidity of the oil due to environmental factors, which will affect the safety of food.

 oil refining equipment

Henan Zhongxing Grain and Oil Machinery Co., Ltd. An enterprise specializing in the scientific research, manufacturing and sales of oil pretreatment equipment, oil leaching equipment, and oil refining equipment. Provide customers with high-quality products and services for more than 20 years. The company solves production problems for customers with professional scientific research and manufacturing level, mature technology, high-quality equipment and excellent after-sales service team. We provide customers with free factory design drawings, equipment layout drawings, process flow diagrams, equipment package installation, and teaching technology. We provide customers with high-quality products and services based on quality-oriented, technological innovation, and service-oriented purposes.

Henan Zhongxing's main refining equipment includes: animal oil refining equipment, rapeseed oil refining equipment, peanut oil refining equipment, tea seed oil refining equipment, sunflower oil refining equipment, walnut oil refining equipment and other oil equipment. Welcome to leave a message for consultation.