Researchers from a research group at Purdue University in Indiana, USA, said on the 21st that they have developed a new method that can quickly detect melamine levels in dairy products. This method combines mass spectrometry with low-temperature plasma technology and can be used in an open environment with features such as high detection sensitivity, rapid process, and accurate results.
Graham Cooks, a research group leader and professor at Purdue University, said that the new method can detect melamine in liquid milk or powdered milk in only about 25 seconds, even if it is extremely small.
Melamine is a chemical raw material, odorless, low toxicity, slightly soluble in water, commonly used in the manufacture of daily utensils, decorative materials and fabric finishing agents.
According to the new method detection process, researchers first use helium or other gases to attach a set of charged particles to the surface of the extracted milk sample. These charged particles ionize with some of the molecules in the sample, making them chargeable and of a quality. The mass spectrometer then recognizes and analyzes these molecules.
The U.S. Food and Drug Administration (FDA) set the standard for melamine content in milk powder in November last year: Milk powder must not contain melamine and its derivative cyanuric acid at the same time. If it contains any one of them, its content should not exceed 1 million. one.
"These standards urgently require a set of detection methods that are sensitive, fast, accurate, and easy to use," said Cooks. "We see it as a challenge and try to develop a way to detect more quickly with simpler tools." , to enable the detection to be carried out on the spot, eliminating the need to process samples."
Cooks said that even if the food is not directly contaminated by melamine, a small amount of this substance is sometimes mixed in production, processing, packaging and transportation. In view of this situation, the new method has a higher detection sensitivity and can detect one-billionth of the melamine content in dairy products.
Cooks said: "Our approach will determine if the melamine content in dairy products exceeds safety product standards."
In addition to its high detection sensitivity and rapid process, the melamine rapid measurement method developed by the Cooks team also uses a new type of open ionization technology to make detection easier and more efficient.
He also predicted that mass spectrometers will become easier to operate and carry because people want more information about the chemical components contained in the articles. "Perhaps one day, everybody will have a mass spectrometer. Whenever there is a problem, it will be tested at any time." Yan Jie
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