Chinese scientists have recently developed a low-field NMR analyzer that can quickly detect whether milk is adulterated. The use of this method to detect cow's milk is easy to operate and low in cost, and it is expected to effectively solve the difficult problem of milk adulteration and doping.
China's dairy industry has entered a golden period of rapid development. However, the occurrence of the “melamine†incident caused a fatal blow to the dairy industry, and the issue of adulteration of raw milk and dairy products has also received attention from all sectors of society. Dairy safety has become a food safety issue that the public is most concerned about.
According to the inventor of the detection method, Prof. Han Jianzhong of Zhejiang University of Commerce and Industry, the research of the research group is based on the working principle of low-field NMR, which uses the activity of hydrogen nuclei in the magnetic field to track the hydrogen atoms in the tested substances. It is water, which includes combined water, non-flowing water, and free water in food, and observes changes in its state of existence over time.
Han Jianzhong said that this detection method can not only identify pure milk and adulterated milk, but also has a good differentiation effect on common adulterants. Moreover, experiments have shown that different adulterants are distributed regularly with adulterants. Therefore, this technique can also be used to monitor changes in the quality of milk caused by adulterants and their concentrations.
At present, adulterated adulterants commonly used in cow's milk include water, salt, urea, soybean milk, and reconstituted milk. Physical and chemical methods are commonly used for their detection. However, physical and chemical tests are targeted. When it is not clear what the additives are, they need to be checked one by one, which takes time and effort. However, once the added components have no ready-made detection method, the detection is difficult. What's more, these methods are not suitable for large-scale sampling inspections in actual production.
At present, the multi-index rapid detection device for milk composition on the international market is not only expensive, but also limited to known additives, and most manufacturing companies cannot afford it. The research team believes that low-field NMR combined with principal component analysis is simple, quick, and inexpensive. It can be used to detect unspecified adulterants, and it can be applied to sampling of large quantities of samples.
The results have now been verified by the results of relevant experts. Experts believe that this new detection technology has provided new research ideas and effective means for modern dairy companies and related regulatory agencies to monitor, evaluate and control the quality of dairy products. (Zhang Le)
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