Supermarket oil should refer to commercial edible oil, and rural self-pressed oil is edible oil squeezed by farmers themselves. The two kinds of oil mainly differ in the oil extraction process and raw materials. The raw materials are only slightly different in cleanliness, and there is not much essential difference. The important thing is not these two points, but the quality of the oil. One is safe, the other is full of flavor. Each has its own merits.

Plant edible oils sold in supermarkets

Let’s start with the edible oils sold in supermarkets, which are packed in plastic barrels or bottles and bear registered trademarks. There are many brands and varieties. Depending on the raw materials, there are edible oils such as soybean, peanut, sesame, sunflower, and rapeseed, as well as olive oil, camellia oil, corn embryo oil, grape seed oil, flax oil, and so on. Depending on the process, there are cold-pressed oil, refined oil, blended oil, etc. Among them, the cold-pressed oil is the antique oil pressing method, the refined oil is the leaching method, and the blended oil is a mixture of two or more oils.

The main process of commercial edible oil is the leaching method, which has a high oil yield and almost completely squeezes out the raw materials. It is then separated from light gasoline and finally refined. Refined oil not only has a high oil yield, but also has clean oil quality. In other words, after refining vegetable oil, only oil and fat are left, without other substances. The aroma of peanuts, sesame, and sunflower that people are used to is completely gone in the oil. The aflatoxins, contamination residues, and even causative ingredients that people were worried about were all gone.

It is worth mentioning the blended oil. It’s hard to tell clearly what the ingredients of blended oil are. It may be labeled soybean oil, peanut oil, or some other oil. As long as there is the word “blended” in it, it’s basically not the vegetable oil labeled. If so, why not just buy the oil directly? Blended oil is very cheap because the cost is low, much lower than peanut, soybean and sunflower. The main ingredients are oils extracted from cheap raw materials such as rice bran oil, soybean meal oil, and palm oil, and then mixed with some serious oils. Blending in peanut oil is peanut blended oil, blending in soybeans is soybean blended oil, and so on, of course the blending ratio is not very large.

High-end vegetable edible oils in supermarkets are only cold-pressed oils, which imitate ancient methods and retain most of their nutrients.

Self-pressed oil in rural areas

There are basically two techniques for self-pressed oil in rural areas: one is manual and the other is mechanical, both of which are cold pressing. Moreover, there is no filtration process of modern technology, the raw material ingredients are retained to a large extent, and the smell is rich.

Self-pressed oil in rural areas mainly includes peanuts, soybeans, sesame, rapeseed, cottonseed, camellia and other crops. The main features, in addition to the strong fragrance mentioned above, are the clean materials. The farmers select them by hand, watch the processing, and receive the oil by themselves. So you can eat it with confidence, but the oil yield is low, there are many impurities in the oil, and there is a lot of fumes from cooking.

Self-extraction of oil in rural areas has certain safety risks. Unlike factory-refined oil, all substances in the oil, good or bad, are filtered out. Even cold-pressed oil has a filtration process to remove harmful substances. Self-pressed oil in rural areas does not have this setting. If there are harmful substances or residues in the materials, they cannot be removed. In particular, we should be reminded of aflatoxin, which is easily produced by peanut mold and is tenacious in survival. Except that industrial processing can completely remove it, there is no way to remove it in rural processing.

Selection of vegetable edible oil

What needs to be emphasized repeatedly is the issue of aflatoxin residue. Oil extraction in rural areas is not done in batches. The East family produces dozens of kilograms, and the West family produces more than ten kilograms. Everyone thinks that their selection is very clean, and it is indeed clean. However, if a few of 100 kilograms of peanuts contain this substance, it will cause pollution. Not only does it contaminate your own oil, the oil press will also carry it with it, thus contaminating the next household. Because the amount is small, you don’t feel contaminated. But it is a toxin after all, and it is difficult to eliminate. What is even worse is that it accumulates in the body and only attacks when it reaches a certain level.

So, for the sake of safety, it is recommended to buy cooking oil from the supermarket, even if it is blended oil, at least you will not worry about this risk when eating it. Of course, cold-pressed oil is more expensive, costing more than ten yuan per pound. However, if you calculate carefully, pressing oil yourself, such as peanut oil, will only cost about ten yuan per pound.