On September 13, the Beijing Food Safety Monitoring Center conducted a full-scale battle for about three months, comprehensively screened more than 80 technical testing projects that may be involved in the waste oil, and finally found four effective indicators for detecting the waste oil. Established an indicator system for the detection of waste oil. In the case of the Zhejiang Province, which was cracked by the Ministry of Public Security, the Beijing Food Safety Monitoring Center used the previous research to test the qualitative effect of the trench oil found in this case. Oil has played a necessary technical support for the harm to the human body.
Beijing Food Safety Monitoring Center
Initial establishment of detection index system in 3 months
“At present, there is no specific testing standard for waste oil in China.†Lu Yong, director of Beijing Food Safety Monitoring Center, told reporters that it is safe and reliable to test edible oils and fats, based on the edible vegetable oil that was implemented on October 1, 2005. health standard". However, this standard is usually used to determine whether the edible oil normally produced by the enterprise is qualified. The extreme “production†method of “ditch oil†has not been taken into consideration in advance. Therefore, the existing national standard cannot be used to determine whether the oil belongs to the trench. oil.
Gutter oil is a general term for all kinds of waste edible oils and fats. The State clearly stipulates that waste oils must not be processed and used or sold as edible fats and oils. However, for the benefit of the interests, individual unscrupulous enterprises or individuals will process the waste oil and then flow to the market through “underground channelsâ€, posing a threat to consumers' table safety. Since China has not yet established a complete set of technical specifications for the detection of waste oil, it has brought difficulties for the regulatory authorities to identify whether there is any waste oil in the market.
Since June this year, Beijing Food Safety Monitoring Center has organized experts from the Municipal Physical and Chemical Analysis and Testing Center, the National Environmental Product Quality Supervision and Inspection Center, the National Food Quality and Safety Supervision and Inspection Center, Peking University, China Agricultural University, etc. Identification techniques are carried out for evaluation. In the past three months, the inspectors have comprehensively applied modern analytical testing methods such as chromatographic analysis, spectral analysis, physical and chemical analysis and genetic identification technology to carry out technical research on the identification of waste oil, and have carried out all kinds of technical indicators in more than 80 times. The screening identified four major categories of polycyclic aromatic hydrocarbons, cholesterol, electrical conductivity, specific genes, and more than 20 items with important identification significance, and initially established an index system for detecting waste oil.
Core Secret: 4 types of indicators make the trench oil appear in the original shape
The first indicator: polycyclic aromatic hydrocarbons (PAHs). Polycyclic aromatic hydrocarbons (PAHs) are aromatic compounds containing a plurality of benzene rings produced by heating, such as frying, roasting, frying, frying, etc., which are persistent organic pollutants. Most PAHs have been listed as carcinogens by the International Cancer Research Center. .
The second indicator: cholesterol. Edible vegetable oils generally do not contain cholesterol or are extremely low in content. The technician may, based on the fact that the waste oil may contain animal-derived components, conclude that if the cholesterol is detected and exceeds a certain range, the grease may be suspected to be a waste oil.
The third indicator: conductivity. Normal fats are almost non-conductive, but the various polar substances produced by the rancidity of the oil can make the grease conductive. The trench oil is electrically conductive due to the doping of a large amount of metal ions, and the electrical conductivity is high.
The fourth indicator: specific gene composition. The waste oil is a mixture of waste oils from many different sources, often containing animal fats. The testers identify the animal genes in the oil according to the molecular biological genetic identification method to determine whether the edible oil contains animal-derived ingredients. Dr. Zhao Linna from the testing center told the reporter: "It is extremely difficult to extract a very small amount of animal DNA fragments from oil, which is the animal's genetic sequence. It is a technical obstacle in the world. We have tried many methods to find the extracted animals. The genetic approach."
Simulation test found that there is profiteering in the trench oil
There is no sample of waste oil, how to conduct the test? The researchers of Beijing Food Safety Monitoring Center set up a wok outside the laboratory to carry out simulation experiments. Fritters, French fries, chicken legs, fat meat... Various materials were put into the oil pan. The researchers put the peanut oil, soybean oil, etc. after repeated frying, and placed it for more than a week until the oil smelled sour. In this way, the real version of the “ditch oil†is generated.
The technicians used the adsorbent to remove impurities, and after some deodorization and refining, it was found that after several treatments, the “ditch oil†was tested according to the national standard of edible oil, and the indicator was indeed “qualified productâ€. More critically, the technicians found that there are indeed huge profits behind the refining of “ditch oil†due to the relatively cheap materials such as adsorbents. According to calculations, the cost per ton of “ditch oil†reduced to “qualified goods†is only about 3,500 yuan, while the market price of edible oil is about 8,000 yuan per ton. If the criminals adopt a simpler method, the cost can be lowered even lower.
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