Oil is an essential element for people every day. It can provide the energy necessary for the body to grow and develop. The oil is rich in amino acids and other vitamins and various trace elements. . Oil is produced by pressing this method. It can be divided into cold pressing and hot pressing. There are some differences. What are the differences between cold pressed oil and hot pressed oil? Â
1. There is a difference in the process between cold pressed and hot pressed edible oil.
Cold pressing is a process for producing oil. The cold press is sent to the oil press under the condition of less than 60 ° C before the oil is pressed, and the oil is pressed at a lower temperature and the acid value is lower, generally no refining is required. After precipitation and filtration, the product oil is obtained.
The hot press is to first clean the oil, crush it and then heat it at high temperature to make a series of changes inside the oil, such as destroying the oil cells, promoting protein denaturation, reducing the viscosity of the oil, etc., so as to be suitable for crushing oil and increasing oil yield. . Â
Second, the loss of oil nutrients by two different oil extraction methods is as follows:
The cold pressed oil completely preserves the physiologically active substances in the oil. For example, vitamin E has anti-aging function, sterol has a skin-friendly effect and enhances the metabolism function of the human body, and is more in line with the needs of the human body.
When hot pressed, the high-temperature oil extract causes the bioactive substances in the oil, such as vitamin E, sterol, and carotenoids, to lose a lot during the pressing process. Â
Third, other aspects
1, production
Cold-pressed oil has pure natural characteristics, avoids the adverse effects of traditional high-temperature oil processing, retains the natural flavor and color of the oil, but has a low oil yield, so the price is higher. Hot pressing is the extraction of oil crop seeds by roasting, the smell is particularly fragrant, the color is deep, and the yield is high.
2, smell
Cold-pressed seeds are not fried and roasted, the smell is poor, the oil taste is not fragrant, but the color is good, not on fire, and the hot pressed oil smells particularly fragrant and dark.
The hot pressing method generally takes the oil before the oil is cleaned and then crushed and then subjected to high temperature heat treatment, so that a series of changes occur inside the oil: destroying the oil cells, promoting protein denaturation, reducing the viscosity of the oil, etc., so as to be suitable for pressing Oil and increase oil yield. However, the oil extracted from the oil after the high temperature treatment is darker in color and the acid value is increased, so the oil must be refined before being eaten. At the same time, high-temperature oil extraction makes the bioactive substances (vitamin E, sterol, carotenoids, etc.) in the oil material lose a lot during the pressing process, resulting in waste of resources, and the hot-press screw presser that is generally used during hot rolling.
The cold-pressing method refers to the oil being pressed into the oil press without being heated or low temperature before being pressed, and the cold pressing method is generally processed under an environment of less than 60 °C. The cold-squeezed refined oil retains the natural flavor and color of the oil, and completely preserves the physiologically active substances in the oil. The degree of protein denaturation is low, and it is easier to comprehensively utilize the protein. The raw material of the cold pressed oil must be selected, otherwise it will affect the quality of the cold pressed oil. In general, cold pressed oil has low smoke points and unstable water content, which is not conducive to long-term storage. Here, the cold press recommends the Qilong cold press screw press.
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