According to a report from the US Food Safety News Network on August 10th, the research team funded by the Chinese Ministry of Health announced this week in the Talanta magazine, a peer-reviewed journal, that they have invented a rapid test method for the detection of melamine in dairy products. Simple color change test method.
After the 2008 melamine milk scandal that estimated an estimated 300,000 children and 6 deaths, the research team began developing test methods.
In the article, the researchers stated that they developed a colorimetric detection method that uses gold nanoparticles to detect whether a product is contaminated with melamine. When melamine is present in the product being tested, the nanoparticles come close to each other and aggregate, and their color changes from burgundy to purple or blue. This method has a detection limit of 1.0 ppm for liquid milk. The detection limit for infant formula milk powder was 4.2 ppm. After using UV-visible spectrophotometry, the sensitivity was improved, the detection limit of liquid milk was 0.15 ppm, and the detection limit of infant formula milk powder was 2.5 ppm. This test can be completed in 30 minutes and does not require pretreatment. Therefore, the researchers said that this method is suitable for on-site inspection of dairy products that contain melamine.
This new test method has the advantages of faster and lower cost compared with the existing methods, and does not require advanced together or solid phase inspection, but its sensitivity is relatively low compared to other test methods. . Although its sensitivity is low, the researchers say that the sensitivity of this test method is sufficient for the regulatory authorities to monitor the level of melamine in dairy products.
It is reported that in Europe and the United States, the safety limit for melamine is currently 2.5 mg kg-1, while in China, infant formula is 1 mg kg-1, and other dairy products are 2.5 mg kg-1.
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