(Reporter Dou Hongmei) Yesterday, our reporter learned that after only three months of hard work, the city’s food safety monitoring center has comprehensively screened more than 80 technical inspection items that may be involved in waste oil, and finally found out. There are four types of effective indicators for cooking oil.
At the end of June this year, Xinhua reported that through unannounced visits, it was discovered that there was a phenomenon of manufacturing and selling of waste oil in the surrounding areas of Beijing. The leaders of the municipal party committee and the municipal government attach great importance to it and clearly request the relevant departments to strengthen the study of issues. The municipal food safety office was quickly deployed and actively organized and implemented. Since then, this food safety issue, which has attracted much attention from consumers, has officially become the “tackling†direction of the Beijing Food Safety Monitoring Center.
“At present, China has not specifically targeted the testing standards for waste oil.†Lu Yong, director of the city's food safety monitoring center, told reporters that the inspection of edible oils is qualified and safe, based on the “food and vegetable oil hygiene†implemented on October 1, 2005. standard". However, this standard is usually used to determine whether the company's normal production of edible oil is qualified, and did not take into account the extremely harsh "production" method of "drift oil" in advance, therefore, the existing national standard can not be used to determine whether the oil belongs to the trench oil.
Drain oil is a collective name for various waste edible oils and fats. The state clearly stipulates that waste oils must not be processed and used as edible oils and fats or sold. However, driven by interests, individual unscrupulous companies or individuals will waste oil processed through “underground channels†and pose a threat to consumers’ table safety. Since China has not yet established a complete set of technical specifications for the identification of waste oil, it is difficult for the regulatory authorities to identify whether there is a waste oil in the market.
Since June this year, the Municipal Food Safety Monitoring Center has organized experts of the city’s physical and chemical analysis and testing center, the State Environmental Protection Product Quality Supervision and Inspection Center, the National Food Quality and Safety Supervision and Inspection Center, Peking University and China Agricultural University to identify the waste oil. Technology to carry out assessments.
In nearly three months, the inspectors have comprehensively applied modern analysis and testing methods such as chromatographic analysis, spectral analysis, physicochemical analysis, and gene identification techniques to carry out technical research on the identification of waste oil, and successively performed more than 80 technical indicators in all directions. The screening has identified four major categories of polycyclic aromatic hydrocarbons, cholesterol, electrical conductivity, and specific genes, and more than 20 items with important identification significance, and initially established an index system for the detection of waste oil.
It is reported that in the case of the special case of using cooking oil for the production of edible oil from Zhejiang Luyu and other places that were cracked by the Ministry of Public Security, the city’s food safety monitoring center based on previous research had played a qualitative role in detecting the waste oil found in the case and determined the gully. The harm of oil to the human body plays a necessary technical support.
Core Secret
4 types of indicators allow the appearance of waste oil
The first indicator: polycyclic aromatic hydrocarbons (PAHs). Polycyclic aromatic hydrocarbons (PAHs) are aromatic compounds containing multiple benzene rings generated when cooking oil is heated, such as frying, roasting, frying, frying, etc., and they are persistent organic pollutants. The vast majority of 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. According to the technical staff, the waste oil may contain animal-derived components, and it is inferred that if the cholesterol is detected and exceeds a certain range, the oil may be suspected as waste oil.
The third indicator: conductivity. Normal grease is almost non-conductive, but the various polar substances produced after the rancidity of the oil can make the grease conductive. Waste oil generates electrical conductivity due to the doping of a large amount of metal ions and has a high electrical conductivity.
The fourth indicator: specific gene composition. Drain oil is a mixture of waste oils from many different sources, and often contains animal fats. The testers identify the animal genes in oils and fats according to molecular biological gene identification methods to determine whether the edible oils contain animal-derived components. Dr. Zhao Linna of the Testing Center told the reporter: “Extracting a very small amount of animal DNA fragments from oil, which is the animal's genetic sequence, is extremely difficult and it is a technical obstacle in the world. We have tried many methods to find the extracted animals. Gene approach."
The Ministry of Public Security commanded the cracking of three provinces
Major production and sale of waste oil
Police evidence shows that individual experts claim that the production process of waste oil is complicated and costly is misleading
Recently, the Ministry of Public Security instructed public security organs in Zhejiang, Shandong, and Henan Province to crack down on a case of production and sales of waste cooking oil. A black industrial chain of waste oil, which includes fishing, sizing, reselling, deep processing, wholesale, and retail, surfaced. . This is the first time that the public security agency has cracked down on the major cases of producing and selling cooking oil using cooking oil as raw material.
In March 2011, the Zhejiang police received a report from the public and found that local people used kitchen waste to refine waste oil. From March 28 to March 30, the police arrested six suspects, including Huang Changshui who specialized in the acquisition and rigging of waste oil.
According to Huang Changshui's clues, from April to July this year, the police launched an investigation on Shandong Jinan Green Company. On July 4, the Ministry of Public Security unifiedly directed the police in Shandong and Zhejiang to cooperate and successfully destroyed Jinan Green Bio-Energy Co., Ltd. to use "ditch oil" to refine the "black factory" of edible oil and seized two illegal production lines.
According to the flow of Green's refined oil products, on July 14, the Ministry of Public Security undertook the police in Zhejiang, Henan and other places to arrest 17 criminal suspects such as Yuan Yi, head of Zhengzhou Hongda grain and oil firm.
In order to extract huge profits, Yuan Yi, one of these oils, who did not dare to eat, was sold to some grain and oil shops in the suburbs of Zhengzhou, or to the nearby hotels, restaurants, canteens at the construction site, night stalls, and fritters. Some of the trench oil is also affixed with a famous edible oil brand trademark.
A large amount of evidence held by the police fully proves that the technological process for refining cooking oil with cooking oil is only a simple physical separation. Previously, some experts said that "the process of refining cooking oil with cooking oil is complicated and difficult for ordinary people to master, and the cost of refining is so expensive that it outweighs gains and losses." This is not a misleading fact.
Behind this case, it also reflects the three major problems that exist in China's waste oil supervision mechanism. One is the lack of standards. The second is poor supervision. In this case of waste oil, there are no relevant administrative law enforcement agencies in every aspect of fishing, smelting, reselling, deep processing, wholesale, and retail. Third, the sale of bio-diesel and other kitchen waste treatment products was poor.
The person in charge of the Ministry of Public Security suggested that the State should issue a test for the production of edible oil for cooking oil refining as soon as possible, and provide policy support for enterprises that actually use waste oil to produce biodiesel.
(According to Xinhua News Agency)
Behind the news
Frying wok to restore the whole process of production of waste oil
Behind a mature detection index is countless test verification. The reporter learned that until the end of July, when the Ministry of Public Security sent samples of waste oil discovered in other places, the Municipal Food Safety Monitoring Center conducted tests on more than 80 edible oil samples from the city, and no traces of waste oil have been found.
There is no sample of waste oil. How to research and explore the characteristics of waste oil? Those masters and doctors who were dressed in white coats and operated a precision instrument worth several million yuan actually set up a cooking pot and performed simulation experiments outside the laboratory.
"Frying sticks, French fries, chicken legs, fat ... we put all kinds of materials into the pan." The researchers told reporters that the peanut oil, soybean (4184, -22.00, -0.52%) oil after repeated frying It was placed for more than one week, and sampling was continued during the process until the oil smelled sour. In this way, the simulation of the real version of the "drainage oil" was produced, and the technicians again set up the vessel to boil, separate the oil and water, and then used alkaline clay and other adsorbents to remove the impurities and use the activated carbon to deodorize...
After such refinement, technicians did find many problems. The first is that “drainage oil†has undergone several treatments, and then it is tested according to the existing edible oil national standard. The indicator is indeed a “qualified productâ€. Second, sorbents and other materials are relatively cheap. There are indeed huge profits behind the refinement of “oil for cookingâ€.
According to calculations, the cost per ton of “ditch oil†to be returned to “qualified products†is only about 3,500 yuan, while the market price of edible oil is about 8,000 yuan per ton. If lawless elements adopt a simpler method, the cost can be lowered even lower.
Newspaper reporter Dou Hongmei
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