Rice is an important human food crop. Rice protein has excellent nutritional quality due to its relatively reasonable protein and amino acid composition. Protein content not only affects its nutritional quality, but also has an important impact on cooking quality. The protein and its content in the relevant standards for evaluating rice quality are considered as one of the important indicators for evaluating the quality and providing process parameters for deep processing industry production.
The Kjeldahl method has a wide range of applicable samples, accurate test results, and good reproducibility, but the traditional Kjeldahl method uses Kelly bottle digestion and semi-micro-alkaline nitrogen distiller for nitrogen determination. The device is complicated and the distillation process is difficult. Control, prone to sucking phenomenon caused by the failure of the experiment, and long digestion time, a greater environmental pollution, is not conducive to practical use. In this experiment, a nitrogen-digestion furnace and an automatic nitrogen determination instrument were used instead of the first two, which not only takes into account the accuracy of the Kjeldahl method, but also facilitates the operation, saves time, improves work efficiency, and is suitable for large-volume sample measurement. This experiment measured the protein content of seven kinds of local rice, and compared the test results, to provide reference for people to eat rice.
The use of intelligent numerical control digestion furnace instead of the traditional Kelvin bottle, the operator can digest multiple samples at the same time, suitable for batch sampling. Automatic nitrogen determination instrument does not need to add artificial acid, alkali and other cumbersome operations, easy to use, but pay attention to distillation, acid, alkali, dilution time control and heating power selection, as much as possible to complete nitrogen. The nitrogen analyzer stops the cooling water in the distillation process, and it is safe and efficient to prompt or alarm the instrument in the event of lack of liquid, safety door is not closed, the sample position is not placed well, and the collecting liquid temperature is over temperature.
The determination method of the nitrogen determination instrument is basically the same as that of the traditional Kjeldahl method for the same sample. The protein content of different rice varieties varied greatly. The contents of protein in Zimiao, Shanyou rice and local japonica rice were the largest, and there was no significant difference among them. The protein content of late rice rice was lower than that of the former three rice, and slightly higher than that of Northeast rice. The protein content of glutinous rice was the lowest, and there was no significant difference between the two.
The Kjeldahl method has a wide range of applicable samples, accurate test results, and good reproducibility, but the traditional Kjeldahl method uses Kelly bottle digestion and semi-micro-alkaline nitrogen distiller for nitrogen determination. The device is complicated and the distillation process is difficult. Control, prone to sucking phenomenon caused by the failure of the experiment, and long digestion time, a greater environmental pollution, is not conducive to practical use. In this experiment, a nitrogen-digestion furnace and an automatic nitrogen determination instrument were used instead of the first two, which not only takes into account the accuracy of the Kjeldahl method, but also facilitates the operation, saves time, improves work efficiency, and is suitable for large-volume sample measurement. This experiment measured the protein content of seven kinds of local rice, and compared the test results, to provide reference for people to eat rice.
The use of intelligent numerical control digestion furnace instead of the traditional Kelvin bottle, the operator can digest multiple samples at the same time, suitable for batch sampling. Automatic nitrogen determination instrument does not need to add artificial acid, alkali and other cumbersome operations, easy to use, but pay attention to distillation, acid, alkali, dilution time control and heating power selection, as much as possible to complete nitrogen. The nitrogen analyzer stops the cooling water in the distillation process, and it is safe and efficient to prompt or alarm the instrument in the event of lack of liquid, safety door is not closed, the sample position is not placed well, and the collecting liquid temperature is over temperature.
The determination method of the nitrogen determination instrument is basically the same as that of the traditional Kjeldahl method for the same sample. The protein content of different rice varieties varied greatly. The contents of protein in Zimiao, Shanyou rice and local japonica rice were the largest, and there was no significant difference among them. The protein content of late rice rice was lower than that of the former three rice, and slightly higher than that of Northeast rice. The protein content of glutinous rice was the lowest, and there was no significant difference between the two.
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