"Irrigation oil" testing is a worldwide problem. On the 15th, 10 "quick oil multi-parameter comprehensive rapid screening kits" appeared in Sichuan, which allowed the emergence of "drainage oil" in more than 10 minutes. At present, this test method is being tested on a "test paper" version. Once it is successfully developed, it will be a great shock to the producers of "ditch oil".
Two bottles of true and false “garbage oil,†let more than a dozen experts who watch colors and taste again can not determine the true and false. After 20 minutes, the real bottle of "oil for cooking" appeared in front of an instrument. On the 15th, 10 "Multi-parameter comprehensive quick screening kits for cooking oil" were unveiled in Sichuan, and they will be equipped with provincial food and drug surveillance systems and nine cities and counties such as Mianyang and Deyang.
According to reports, this is the first appearance of the kit in the national food and drug monitoring system.
Debut
Four Steps Make Oil "Yin and Yang" More Than 10 Minutes Faster
On the morning of the 15th, Sichuan Food and Drug Administration carried out a rapid inspection training on “drainage oilâ€. In the training class, 10 sets of instruments for rapid screening of "oil production" were unveiled. The reporter saw that the trainer Liu Yiyi selected two different bottles of samples, one of which was edible oil mixed with “drain oil†and the other was regular edible oil.
After putting together two bottles of samples, most people, including food and drug inspection experts, could not identify authenticity at all. “We usually have headaches as well.†According to Ms. Yin of the Ganzhou Food and Drug Inspection Institute, the source of the cooking oil is complex, mixed with different ingredients, and some are processed by washing, distillation, decolorization, or blending with edible vegetable oils. , It is difficult to distinguish between sensory analysis and some physical and chemical indicators. Routine test indicators are basically ineffective.
As soon as everyone took the same two bottles of colorless oil, Liu Yiyi began his experiment. He used a straw to take 9 drops of oil from each of the two bottles of oil and added them to a square glass tube and shake vigorously. Subsequently, the glass tube was placed in boiling water.
The reporter found that the color of two oils in boiling water gradually changed, one of which was red. After 10 minutes, Liu Yiyi started to zero the glass tube with pure water on the instrument, and then placed two glass tubes in boiling water on the zero-calibrated instrument. One showed the word "Yang" and the other showed The word "yin". The word "Yang" is the waste oil.
Secret
Detection of "polar markers" has passed blind test testing
Why can this instrument make the bottle of "ditch oil" appear? According to Sang Huachun, a researcher and professor at China Agricultural University, “ditch oil†is often repeatedly fried or heated at a high temperature compared to edible oils. This produces some substances that cannot be removed even after refining. This material is called "polar marker". The “polar marker†is the key to the emergence of “drainage oilâ€. The instrument is to determine whether it is “drainage oil†by measuring the number of “polar markersâ€.
"The polar marker can react with the detection reagent and appear red. The higher the content, the darker the red color. Once it exceeds the set threshold, it will be positive." Sang Huachun said.
This reporter learned that this instrument is named "Multi-parameter comprehensive quick screening kit for waste oil". In May of last year, the Ministry of Health identified seven effective "waste oil" testing methods from more than 300 detection methods, of which three were rapid tests, and screening boxes were among them.
Liu Yiyi said that during the R&D phase, they had experienced tens of thousands of experiments before they finally formed. "This kind of instrument for food and drug inspection is now selling for 21,000 yuan."
Reading in depth
Test strips are being developed for about 20 yuan
Sang Huachun also told reporters that the small package that uses the same principle as the instrument has also been officially marketed for production and sales. "The price is about 200 yuan, with 10 samples installed, can quickly measure the results of 'ditch oil' within half an hour." Sang Huachun said that small packaging kits have been sold online. "Objectively speaking, compared with the instruments purchased by the food and drug administration department, there is still a certain gap between the stability and consistency of the small package." Sang Huachun said that because the small package saves a lot of links, after heating in boiling water Consumers must judge their colors with the naked eye, which has an impact on accuracy.
In addition, a more convenient test strip type has also been developed for half a year. Sang Huachun said, "After breaking this technical difficulty, the test strip will be marketized and the price will be around 20 yuan."
The preliminary screening results are not based on direct punishment
At present, in order to improve the testing capability of “oil and gas†around the country, 10 “ditch oil†rapid detectors have been installed in the Inspection and Quarantine Bureau of Sichuan Food and Drug Administration, and Mianyang, Deyang, Nanchong, Zigong, Cangzhou, Leshan, and Guangyuan. Suining, Neijiang City Food and Drug Administration. This is also the debut of the instrument in the National Food and Drug Administration.
The Provincial Food and Drug Administration stressed that the instrument is only used for screening "ditch oil." If a suspected "ditch oil" is found, it should promptly investigate the catering companies involved in the restaurant according to other means such as food waste. "There is no uniform standard at present, so this can only be used as a preliminary screening, and it cannot be used as a direct punishment basis."
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