For food, everyone not only pays attention to its quality and safety, but also pays great attention to the nutritional value of food. Therefore, determining the nutritional indicators of food has important significance in modern food production and processing. Because there are many indicators for measuring food nutrition, and in the process of measurement, the conventional methods are often complicated, affecting efficiency and measuring results. Therefore, most of them are measured by professional instruments, which are aimed at rice, beans and other foods. The determination of protein content is usually carried out using a Kjeldahl analyzer .
The determination of grain protein mainly uses two kinds of methods, one is indirect method, the other is direct method, the indirect method calculates the protein content by protein coefficient according to the nitrogen content after nitrogen fixation, Dumas combustion method and Kjeldahl The nitrogen determination method is the most widely used indirect method; the direct method utilizes the physical or chemical properties of the protein, and the instrument is used to establish the working curve to obtain the protein content. The direct methods include near-infrared spectroscopy, ultraviolet spectrophotometry, electrophoresis, and ultraviolet absorption. Spectroscopy and Bradford method. After comparing different methods, it has been found that the Kjeldahl nitrogen analyzer is used to determine the grain protein content, which has the advantages of high sensitivity, good stability, high efficiency, fastness, precision, etc., and the cost is lower, so the instrument is more popular in the industry. .
The application of Kjeldahl nitrogen analyzer in food quality testing not only satisfies the basic requirements for accurate determination of protein content in grain quality testing, but also provides technical support for rapid and accurate detection of large quantities of samples in laboratories. The efficiency is also greatly improved and the safety is more secure. With professional instruments to control, the variety of food crops has been further optimized, and the quality level of grain production has been continuously improved, which has played a positive role in promoting the high quality and high yield of modern agriculture.
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