The edible oil that produced from the expeller is called crude oil; after the crude oil goes through the refinery process, it becomes the refined oil. Oil refinery is for the purpose of reducing the impurities and the toxic matters in the oil to make its shelf life longer.
The impurities can be divided into 4 types due to their states in the oil: 1 the floating impurity: sand, embryo residue, powder and other solid matters. These matters will accelerate the growth speed of the microorganism and the oil hydrolytic rancidity process. 2 Gel soluble impurities, including the phospholipids, proteins, sugar, etc.
These matters can also make the oil go bad easier, it makes the oil looks muddy, it will generate a lot of scum and black precipitate with the high cooking temperature, the flavor of thecertain degrees of toxic matters. 3 Oil soluble impurities: including free fatty acid hydrocarbon wax, pigment, aldehyde and ketone, micro amount of metal and aflatoxin, etc. The aflatoxin is believed to have the carcinogenic effect. 4 water content, water is also a medium where the microorganism grows in.
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