Is "earth Pressing" Really That Good?

Jun 15 2022 0 Comments

In the cooking process of Chinese food, edible oil is essential. With the improvement of living standards, people have higher and higher requirements for ingredients, and even pursue some "earth" things.
In recent years, people have habitually linked food such as "soil pressing oil" with "organic products" and "green food".


What is the difference between "earth-pressed oil" and branded edible oil produced by regular manufacturers with production licenses?

"Soil pressing oil" means that farmers or consumers use the peanuts, soybeans, sesame seeds, rapeseed, etc. screened out according to their own standards to extract the oil from the oil pressing workshops. people's hearts. Because of its rough production process and simple filtration method, the aroma of the oil extracted from "earth-pressed oil" is rich, which makes consumers feel a very intuitive feeling of "smell, taste, and zero addition". As a result, it has been sought after by consumers, and has even become a "healthy, green, and scarce" gift in the eyes of some people.


What problems and safety hazards may exist in "earth-extracting oil"?

The first is the selection of raw materials. It is generally believed that the raw materials for oil extraction are carefully selected by themselves, and there will definitely be no problems. However, if the freshly harvested raw materials for oil extraction are not fully sun-dried, there is a high probability that mildew will occur and produce Aspergillus flavus. Aspergillus flavus easily produces a large number of metabolites - aflatoxin in rich nutrient conditions and humid and hot environment, which leads to excessive aflatoxin in oil extraction raw materials. However, the traditional pressing method has a low oil yield, and one kilogram of oil requires several kilograms of oil-pressing raw materials. It is difficult to distinguish with the naked eye whether the oil-pressing raw materials are in the mildew stage, and it is even more impossible to remove the moldy oil-pressing raw materials one by one. Aflatoxin is a first-class carcinogen. If you eat edible oil containing aflatoxin for a long time, the risk of cancer will be greatly increased.

Secondly, in the production process, in order to improve the oil yield, it is necessary to fry the oil at high temperature before pressing. In this process, the temperature and time of roasting are all based on the personal experience and feeling of the owner of the "soil pressing oil". Improper operation is likely to produce a large amount of polycyclic aromatic hydrocarbons such as benzopyrene. Benzopyrene is also a first-class carcinogen, and its harm should not be underestimated. At the same time, due to the small investment and simple production process of soil extraction workshops, crude oil refining equipment is usually not equipped. The edible oil produced by the "earth extraction" method can only be called "crude oil" or "crude oil". In the production process of deodorization, impurity removal, and decolorization, there are many impurities such as water, mechanical impurities (dust), colloids (phospholipids, proteins, sugars), free fatty acids, pigments, hydrocarbons, and metal compounds, which may also contain arsenic. , mercury and other toxic heavy metals and residual pesticides, and it is even more impossible to remove pollutants such as benzopyrene and aflatoxin. Direct consumption of such "soil oil" is extremely detrimental to human health.

Furthermore, it is the storage and packaging aspects after production. Due to the limitations of the production environment and sanitation conditions of the "earth-pressed oil" workshop, it is difficult to avoid the situation of microbial contamination. In addition, the "earth-pressed oil" has a high impurity content, which is easy to be rancid and oxidized. It is difficult to ensure the security of its various indicators. At the same time, production workshops basically do not conduct inspections on "earth-pressed oil", and most of them are outside the scope of food safety supervision.

In the production process of branded edible oil produced by regular manufacturers with production licenses, the raw materials for oil extraction must pass through a mechanized sieve with uniform standards before they can be put into use. The environmental conditions of production also have strict requirements, and the processes such as temperature and humidity have corresponding requirements. There are multiple refining processes in the production process, and it is necessary to carry out dehydration, degumming, decolorization, deodorization, aflatoxin removal and other removal processes. The product quality is strictly controlled within the scope of national standards. It is also necessary to pass a number of indicators before entering the market. In addition to the production control of the production enterprises themselves, market supervision departments at all levels will also regularly supervise, sample and inspect

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