Why Does Edible Oil Need To Be Refined? What Are The Advantages Of Refined Edible Oil?
The edible oil obtained by pressing equipment or leaching equipment usually needs to be refined. This is because during the pressing and leaching process, the edible oil may contain harmful substances such as moisture, fatty acids, pigments, oxides, etc. Refining can remove these harmful impurities while retaining some beneficial substances, such as tocopherol. Common refining equipment includes degumming, deacidification, decolorization, deodorization, etc. These refining steps can make the edible oil more transparent, stable and high temperature resistant, while also improving its taste, nutritional value and storage stability. Therefore, according to the different quality requirements and uses of edible oil, refining equipment is used to remove unnecessary and harmful impurities from the oil to obtain finished oil that meets certain quality standards. This is why edible oil needs to be refined. Refined edible oil has many advantages, which are summarized as follows:
1. Refined oil has better appearance
The purpose of decolorization and deodorization in oil refining equipment is to remove the odorous small molecules in crude oil and the pigments in oil, so that edible oil becomes clearer and brighter and improves the flavor of oil. According to the different types of oils, the corresponding refining process is selected. For example, sunflower oil has a high wax content and needs to be dewaxed to avoid turbidity caused by wax precipitation after storage for a period of time.
2. Refined oil has a wider range of uses
Edible oil processing is a very large industry. As an industrial product, it is necessary to consider meeting various needs in the later stage. There are many impurities in crude oil and the storage time is short. It cannot be used for high-temperature processes such as frying and baking, which limits the scope of use of oil. Compared with crude oil with limited application range, refined oil has higher purity and wider application range, which is more in line with the needs of industrialization and easier to be standardized.
3. Refined oil is more food-safe
The refining process can remove impurities and toxins that are harmful to the human body in the raw materials. For example, cottonseed oil contains cottonpol, which is reproductively toxic and harmful to human health. Therefore, cottonseed crude oil must be refined to meet the standard of safe consumption.
4. More by-products are produced during the refining process
Edible crude oil can produce phospholipids during the refining and degumming process. Lecithin is a high-value-added product that can be used as an emulsifier and stabilizer in food; ② Some vegetable oils can produce tocopherol (vitamin E) during the deodorization process. Vitamin E can be added to food as an antioxidant to delay the oxidation process of food and extend the shelf life of food. In addition, vitamin E itself is a vitamin and is widely used in the fields of health products and medicines; ③ Some palm oil refineries will separate palm oil according to the different melting points of palm oil fatty acids to obtain palm stearin with a higher melting point and solid at room temperature and palm olein with a lower melting point and liquid at room temperature, which can meet the needs of different subsequent processing scenarios of palm oil.
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