漫谈三聚氰胺（Talking about melamine）.docVIP

漫谈三聚氰胺（Talking about melamine） Talking about melamine Abstract: it is an important nitrogen heterocyclic organic chemical raw material. Melamine is reacted with ammonia at high temperature or by urea directly under high temperature and high pressure. The latter is low in cost and widely used. What is commonly used in the food industry, which has been designated as the national standard, is Kjeldahl Kjeldahl method. The Kjeldahl method actually measured protein content but not, by measuring the nitrogen content to calculate the protein content, because the main components in food protein containing only nitrogen and other major components (carbohydrates, fats) do not contain nitrogen, so the Kjeldahl method is an accurate method for the determination of protein content. Kjeldahl method is not accurate if there are other compounds containing nitrogen in the sample. Sanlu brand infant milk powder incident occurred, that is, lawless elements in the raw water, in order to increase the weight of illegal interests. Due to the slight toxicity of melamine, we do not have to talk about tiger discoloration. Key words: melamine; principle; determination; health and safety Melamine, a chemical unfamiliar to us, became a media and public concern after the Sanlu milk powder scandal The focus has become the talk of the streets and lanes. Melamine in the end what is the substance? How does it occur in the dairy products of our daily necessities? Melamine molecular formula C3H6N6. Also known as melamine, 2, 4, 6-, three amino, -1, 3, 5-, three triazine. White monoclinic crystalline, tasteless, slightly soluble in water and hot ethanol, slightly toxic, melamine is weakly alkaline (pKa=8), and can react with a variety of acids to form melamine salts. The salt is hydrolyzed by a strong acid or a strong alkali water solution, and the amine group is replaced by hydroxyl groups gradually, and the man becomes cyanuric acid two amide to further hydrolyze to produce cyanuric acid amide, and f