Self-extracting oil: raw material + time = more expensive than finished oil is not cost-effective!

"Problem Oil" is worrying. Some people are keen to squeeze their own oil.

Recently, the incidents of gutter oil and genetically modified oil have affected the public's nerves and caused people's concern about the safety of edible oil. In the popular "China 2 on the tip of the tongue" a few days ago, the "ancient method of oil extraction" was also staged, which also made the domestic oil press popular recently. Especially the concepts of "pure nature" and "no additions" make the citizens more inclined. However, the safety of self-extracting oil machine is also controversial. Experts said that the lack of modern technology of self-extracting oil due to the lack of refining and impurity removal process, high impurities in oil products, short shelf life, difficult to guarantee the safety situation.

Not Low Cost Oil Presses Sell Tens of Thousands a Month

"Eat your own oil and rest assured that you can squeeze whatever kind of oil you want." Mr. Wang, a citizen, bought an oil press online the other day. New Express reporter searched Taobao online for "household oil press". More than 5400 eligible babies, ranging in price from 480 yuan to 10,000 yuan, were sold mostly between 1500 yuan and 2500 yuan. Some well-selling businesses sold as many as 10,000 units a month.

Ms. Deng has just started a 1,700-yuan oil press, she said, "Businessmen's propaganda is a bit too much." I used it twice, it's a catty of peanut kernels. After frying, it evaporates about 10-15 grams of water. The mixture of oil and peanut butter was 210 grams for the first time and 205 grams for the second time. About 60-70% of the mixed solution is pure peanut oil, and about 38 grams of fine oil residue with high oil content, the oil yield is about 30%.

New Express reporters visited the market and found that the current price of peanuts is 4 to 5 yuan per catty. To squeeze 5 litres of oil, it needs at least 25 catties of peanuts, and the cost is about 100 yuan to 125 yuan. The cost of self-extracting oil is slightly lower than that of bottled oil, and some businesses claim that "self-extracting oil can save half of the money to buy oil", which is obviously inconsistent with the facts.

Although it's convenient to squeeze oil by oneself, it's not only expensive, but also the citizens complain about "trouble". Ms. Ding, an office worker, said that it would take more than an hour to squeeze less than 2 kilograms of peanut oil, not counting the time before and after drying, so it would be better to go directly to the supermarket to buy oil.

The Problem of Raw Material Influencing Oil Preservation

Although the process of oil extraction is visible, the preservation of oil is a big problem. "Self extracting oil has no shelf life, and the oil that was pressed by itself was not released for a long time before the surface. It began to froze and shook. It was very muddy. Although it smelled of no smell, it threw it away." Ms. Sun, a full-time mother, complained on Weibo.

Industry insiders said that because domestic oil press only uses the most original process of commercial oil, containing many impurities and easy to oxidize and deteriorate, it is not suitable for long-term storage.

In this regard, experts suggest that family self-extracting oil should be done as little as possible at a time to avoid oxidation and deterioration caused by long-term storage. In addition, since there is no means to detect self-extracting oil and children are more sensitive to physical condition, it is recommended that families with children eat as little self-extracting oil as possible.

The selection of raw materials is also very knowledgeable, we should try to select fresh peanuts, sesame, soybeans and so on in the current season, pick out the unqualified raw materials such as mildew, black spots, etc., in the absence of detection means, at least to ensure the quality and safety of raw materials.

In addition, in the process of production, we must pay attention to hygiene, sterilize the appliances strictly, and do not let cooking oil be contaminated by the equipment.

Expert: It is difficult to control self-extracting oil products

After the explosion of online oil press, more news came out that "household oil press carefully squeeze carcinogenic oil", which also caused discussion among netizens. Liang Zhenxing, a professor in the Department of Crop Cultivation and Farming of China Agricultural University, believes that the crushing method of household oil press is based on the traditional soil-making method and is physical crushing, but its main risk lies in the quality control of crushing raw materials.

"Take peanuts for example. If the raw material is mildewed, it may contain aflatoxin, and the oil aflatoxin extracted from the raw material may exceed the standard seriously. However, self-extracting oil lacks the technology to deal with harmful substances such as aflatoxin, even if it chooses its own material, it may also appear that aflatoxin exceeds the standard.

Yun Wuxin, a popular science writer of Squirrel Society, wrote an article entitled "Crushing Oil with Weak Advantages but Small Risks" on his Sina-certified microblog recently. He said that in addition to aflatoxin, self-extracting oil can form some benzopyrene and is also one of the carcinogens in the process of high temperature treatment.