Not too long ago, from the University of California, Los Angeles, researchers and Wei Fang Cooperation Who created a speedy, financial and straightforward technique to detect Dairy merchandise Or Meals Regardless of whether with Melamine , Completed the test in just 15 minutes. The results have been published in the international authoritative journal “Applied Physics Letters” on.
“Science and Technology Beijing newspaper”: What approach is usually utilised to detect melamine?
Wei Fang: Melamine is a for Plastic And fertilizers, industrial supplies, if mixed in the meals in, will endanger human overall health, therefore, be quickly out from the test food is specially important. Presently, the most commonly utilized technique is chromatography. As food molecules in the chemical and physical structure of various, so they detect the flow of media at different speeds. According to this theory, we can separate the melamine and other substances, then the measured worth and the mass of melamine than the regular value to establish no matter whether its content exceeded. Accuracy of this technique is very high, far exceeding the state necessary minimum two millionths of the error limit. Even so, testing calls for expensive and complex gear, simultaneous detection of a really long time, generally only utilized in a quantity of quality test centers.
There is also a frequently utilized approach is enzyme-linked immunosorbent assay, the principle is the reaction of enzyme with melamine, made throughout the testing of colored substances in quantitative and qualitative analysis. However, activity is, if the storage and transport in the occasion of a flawed procedure, will influence the test results, so for non-professionals in the operation very challenging.
“Beijing Science and Technology News”: The new record of 15 minutes of detection like?
Wei Fang: Our experiment Milk As the sample. Method is divided into 3 actions, such as five-12 minutes of the separation procedure, and significantly less than 1 minute color precipitation reaction. First, could interfere with melamine test outcomes in the separation of impurities from milk. Then, the solution particles. Gold nanoparticles can be minor to a couple of nanometers, to guarantee that the milk of melamine molecules do not “slip by way of the net”, when it interacts with melamine, the color of the answer will lead to considerable changes occurred. Ultimately, a cyanuric acid, the colour of the nano-particle precipitation.
“Beijing Science and Technologies News”: new ways to save time, but accuracy can guarantee?
Wei Fang: sensitivity of detection experiments measure the accuracy of one of its closely linked with the error. The higher the sensitivity, the smaller sized the error. The new technique is convenient, the sensitivity was slightly reduced than the conventional strategy, but nonetheless exceeded the national minimum error limit of two millionths. I consider the significance of this technique is not to replace the traditional techniques, but offers a hassle-free way of screening. For example, the market place or supermarket managers obtainable in this convenient, compact devices are cleared swiftly regardless of whether the melamine in meals have been determined.
“Beijing Science and Technology News”: The new method can applied in the public property?
Wei Fang: The new test technique does not want the greatest advantage of expert equipment, eliminating the burdensome testing laboratory processes, the same time, test final results can be read within 15 minutes, test benefits can be determined by the naked eye. We hope this analysis can quickly detect the spread in the loved ones, and extended to test any food. At present, the dairy goods, Eggs , Rice Protein concentrates and other foods have been discovered to contain melamine, the safety scenario is not optimistic. Hope in the near future, the new mother can use at residence the gold particle detection, consumption of the baby milk and other infant foods, to ensure that does not include melamine.