The hottest liquid chromatography makes melamine i

2022-10-18
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Liquid chromatography makes melamine in food invisible

chromatography, also known as "chromatographic analysis", is a practical separation and analysis method, which plays an extremely important role in the field of Biochemistry and analytical chemistry. A century has passed since the Russian botanist tswett proposed the concept of chromatography when studying the separation of plant pigments in 1906. With the development of more than 100 years, the products in the chromatographic field have changed and achieved fruitful results, and a variety of instruments have emerged

liquid chromatography is an indispensable part of the chromatographic family. Liquid chromatography is a chromatography method based on the difference of the affinity and force of each component in the mixture, using liquid as the mobile phase. It is widely used in the fields of pesticides, pharmaceuticals, chemical industry, environmental monitoring and so on. As early as the 1990s, liquid chromatography has been mentioned in the field of food detection, and has been written into the national food detection law. In recent years, due to the frequent occurrence of food accidents, people pay more and more attention to food safety, and liquid chromatography has more opportunities in the field of food safety monitoring

the "toxic milk powder" incident in 2008 brought the strange and awkward term "melamine" into people's vision, and has been influencing people's confidence in the quality of domestic dairy products for several years, and also made liquid chromatography stand out in the field of dairy products detection

after the "toxic milk powder" incident, the national food safety emergency standardization working group of national standards and the National Technical Committee for the standardization of inspection methods for key products of quality supervision quickly responded and proposed and centralized the "method for the detection of melamine in raw milk and dairy products" (gb/t), of which two methods involve liquid chromatography up to now: high performance liquid chromatography and liquid chromatography mass spectrometry. Then, the General Administration of quality supervision, inspection and quarantine and the National Standardization Administration approved and issued the rapid detection of melamine in raw milk by liquid chromatography (gb/t) on October 15, 2008. The standard stipulates that high performance liquid chromatography, liquid chromatography-mass spectrometry/mass spectrometry and gas chromatography-mass spectrometry are three methods for the detection of melamine, and stipulates the quantitative limit of detection. The standard is applicable to the quantitative determination of melamine in raw milk, dairy products and dairy products

unlike the artificial and malicious addition of melamine in the "toxic milk powder" incident, some melamine ingredients will indirectly appear in beef, pork, eggs and other foods. Melamine has a high nitrogen content and cannot be detected by the traditional Kjeldahl method, so many unscrupulous businessmen add it to soybean protein powder, meat and bone meal, fish meal, corn gluten powder and other raw materials, or use it as crude protein. Melamine, which is made into feed, still remains in animals after digestion and metabolism. 5 technical requirements further threaten human health

studies have shown that melamine can be found in some food packages, such as plastic products and metal cans. Through contact with food, melamine on the package will migrate to food, which will have a serious impact on human body after being eaten. In addition, some pesticides can also be converted into melamine after entering animals, which reflects the fact that melamine pollution in food has always existed objectively. Therefore, even 10 years after the "toxic milk powder" incident, the state still attaches great importance to the detection of melamine

at present, there are three main methods for the determination of melamine, among which liquid chromatography has always been a popular choice. The standards formulated when people began to realize the need to detect melamine, such as 2007? Year 6? Month 14? The Ministry of agriculture of the people's Republic of China issued a document numbered ny/t? 1372?- 2007? According to the industry standard of "determination of melamine in feed", liquid chromatography has shown extraordinary strength in the field of melamine detection from the beginning. In addition to high-performance liquid chromatography, the combination of liquid chromatography and mass spectrometry is recognized as an important method in the detection of melamine in food because of the specific habits of users and its characteristics of strong selectivity, high sensitivity and good specificity

with the development of chromatographic technology, many outstanding enterprises have emerged at home and abroad, such as Shanghai Wufeng, Nanjing Kejie, Shanghai Yidian, Perkin Elmer, Shimadzu, semefi, etc. their products provide important technical support for food safety testing, including melamine

finally, for the detection of melamine, we must also realize that instrument detection is only a means. It just adds a protective cover to our dining table, but it can not prevent the abuse of melamine. Facing the problem of melamine pollution, in addition to continuously improving the detection technology, the state should also continue to strengthen supervision, strengthen supervision, strictly control the flow of melamine into our food chain, and ensure people's health and safety

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