Experts say that there is no scientific basis for garlic and low-temperature measurement of waste oil

Recently, the network has been widely used to detect two types of waste oil. Method said, put a peeled garlic when cooking, if it turns red, it is waste oil, which proves that the oil contains a lot of aflatoxin; because the garlic is white in the common cooking oil. There is also a way to put the oil in the refrigerator and if there is a white foam after 2 hours, it is the cooking oil.

The new recruits on these networks do not fly? The previous day, the newspaper's curious laboratory obtained a bottle of waste oil from the Industry and Commerce Department (Commercially known as "black heart oil", seized by the Trade and Industry Bureau), and at the same time purchased a pot of branded rapeseed oil in the supermarket through the "garlic method" and " "Fridge method", found that the effect of testing for waste oil is not obvious. The experts of the Bureau of Quality Supervision said that these methods on the Internet are only civil experience and they have no basis.

Experimental time: In the afternoon of November 9th and November 10th, the experimental sample: waste oil, branded rapeseed oil. The two samples showed little difference from the outside, but two minutes after pouring into the two bowls, we could see small bubbles floating on the inferior oil, and the brand oil was clearer.

Experimental staff: Xiao Xia, Xiao Zhang, Xin Xin Special Note: Because of the differences in oil quality and environment, this experiment is for reference only.

[experiment one]

The garlic method - there is no change in the garlic in the waste oil

First, the rapeseed oil was poured into a pot, and the oil was boiled and put into a peeled garlic. The garlic was found to be white.

Afterwards, the waste oil was poured into the pot, and a peeled garlic was also put into it. Later, it was observed that the garlic was also white.

Experimental conclusion: Garlic cannot detect gutter oil.

Experts said: Lu Wen'an, deputy director of the Provincial Quality Supervision and Inspection Institute, said that so far, the Health Department has not identified the method of cooking oil. The arguments about aflatoxin are not necessarily the same. Oil production technology and oil materials may cause aflatoxin to exceed the standard, but it cannot be determined as waste oil. The garlic in the oil does not change color and it is not certain whether it is waste oil.

[Experiment 2]

Refrigerator method - 8 degrees Celsius trench oil does not condense

Netizens said that if the oil is put into a refrigerator with a temperature of about 8 degrees, if it condenses (or a white foam appears), it is waste oil. Ordinary vegetable oil freezes at zero degrees, but the cooking oil is condensed at 8 degrees Celsius, because the waste oil is used repeatedly and the animal oil content is high.

Yesterday morning, the experimenter poured two samples into paper cups, one for waste oil and the other for rapeseed oil. Place two cups in the freezer at a temperature of about 8 degrees Celsius. About two hours later, the experimenter observed that the oil in both cups was not foamed or condensed.

Experimental conclusion: Low temperature can not detect waste oil.

Experts said: According to the network, "8 degrees Celsius condensation is a waste oil," Lu Wenan believes that this is only a normal physical shape changes. He explained that when the liquid oil is usually stored at a temperature lower than a certain point, the triglyceride in the edible oil may produce crystals, and the liquid oil turns into solid fat, which is popularly called “frozen”. This phenomenon is an inherent characteristic of oils and fats, such as peanut oil.

[Experiment 3]

Soy sauce method - Strapping oil layering really slow

Netizens said that soy sauce is shaken in the oil, waiting for stratification and pouring it in a glass. Fresh oil is stratified quickly, with clear delamination, and old oil or trench oil is slowly stratified.

Yesterday, the experimenter added an equal amount of soy sauce to a bowl filled with rapeseed oil and cooking oil, and then poured the mixture of oil and soy sauce into a glass.

After 1 minute, the waste oil + soy sauce mixture was mixed together. The mixture of rapeseed oil + soy sauce appeared to be stratified. The upper part was oil and the lower part was black (mainly soy sauce).

Two minutes later, the waste oil + soy sauce mixture began to delaminate, but the first half was still relatively turbid, when the rapeseed oil + soy sauce mixture was clearly stratified.

Experimental conclusion: The use of soy sauce stratification method to identify waste oil seems to be a bit reliable.

Experts said: For the soy sauce layering method, a quality expert from the Provincial Bureau of Quality Supervision pointed out that this is only a statement of civil experience, but there is no basis.

[Population]

The broad "ditch oil" is the collective name for all kinds of inferior edible oils.

"Irrigation oil" is actually a generic concept and it is a generic name for various types of inferior edible oils.

The narrowly defined "ditch oil" is an oil that is simply processed and extracted from the greasy float in the sewer or the leftovers (ie, drowning water) in the restaurant. In addition to the above-mentioned, the “flood oil” in the broad sense includes oil processed and refined from poor-quality pork, pig viscera and pigskin, and oil used in fried foods is repeatedly used or added to it after being used for more than a certain number of times. The oil that is used again after the new oil.

In addition to lead, arsenic, aflatoxin, and other toxic substances in the "drainage oil", there are also carcinogenic substances such as benzene propane. Consumption of “ditch oil” can lead to indigestion, diarrhea, abdominal pain, and even stomach cancer, bowel cancer and other diseases.

[link]

Ministry of Health spokesman:

There is no test for waste oil

In view of the issue of waste oil detection that is widely concerned by the society, the spokesman for the Ministry of Health, Deng Haihua, pointed out on August 17th this year that the five types of waste oil testing methods collected by the Ministry of Health are not specific enough to effectively identify the waste oil. The Ministry of Health will continue to organize experts to conduct scientific research and collect sow oil testing methods from the society.

In August of this year, the Ministry of Health collected five methods for the detection of waste oil from several technical institutes in Beijing, Wuhan, and some of them mainly detected polycyclic aromatic hydrocarbons. If this component is detected in excess, it can be judged as waste oil. However, this is not a universal rule because refining technology can control PAH content.

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