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How to distinguish between cold pressed oil and hot pressed oil

September 23, 2021

 cold pressed oil and hot pressed oil

Most of the vegetable oils used in our daily life are hot-pressed oil, which has a high oil yield and simple operation. Generally, the oil is cleaned before the oil is crushed, and then subjected to high temperature heating treatment to cause a series of changes in the oil, destroy the oil cells, promote protein denaturation, and reduce the viscosity of the oil. The crude oil fried from the oil after high temperature treatment is darker in color and higher in acid value, so it must be refined before it can be eaten. High-temperature squeezing of oil causes the biologically active substances (vitamin E, sterols, carotenoids, etc.) in the oil to be greatly lost during the squeezing process, resulting in a waste of resources.

The cold oil press has pure natural characteristics and avoids the adverse effects of traditional high-temperature oil press processing. The cold-pressed oil retains the natural flavor and color of the oil, and completely preserves the physiologically active substances in the oil (vitamin E has anti-aging functions, sterols have skin-building effects and enhance human metabolism). The cold-pressed oil has the original flavor, It is the choice of a healthy life. However, most oils are not suitable for cold pressing. Take soybeans, high erucic acid rapeseed, cottonseed, peanuts, and sesame seeds as examples. Gossypol toxins and aflatoxins in spoiled oil must be refined before they can be removed. The scent of sesame oil and peanut oil must be obtained through a hot pressing process.

The raw materials of the cold press must be carefully selected, otherwise due to the different maturity of the raw materials and the harmful substances contained in the raw materials (such as aflatoxin in moldy oil and gossypol toxin in cottonseed), it will be affected. The quality of cold-pressed oil has a serious impact. Generally speaking, cold pressing has a low smoke point and unstable water content, which is not conducive to long-term storage. Cold pressing generally needs to be crushed before the oil output can be increased, and sometimes it has to be squeezed twice and squeezed three times. Hot pressing can be squeezed again, that is, the first time to squeeze the oil. However, some manufacturers have improved the model and used it for oil extraction directly. No other equipment is required. Basically, the raw material can be produced in one pass. Oil rate.