Food impurity screening method
The test sample for impurity is divided into large sample and small sample. The large sample is used to inspect large sample impurities, including large impurities and undersizes of the absolute sieve layer; the sample is a small amount of sample from the sample that is tested for excessive sample impurities. In this case, examine the side-by-side impurities that are similar to grain size. The amount of sample used to inspect the impurities is shown in the following table: grain and oil name weight (g) sample weight (g); small grains: such as millet, sesame, rapeseed, etc. 500 10; medium grain: such as rice, wheat, sorghum, adzuki beans , cottonseed and other 500 500; large grain: such as soybeans, corn, peas, sunflower seeds, small grains, etc. 500 100; extra large grain: such as peanut fruit, kernel, castor bean seed, tung seed, tea seed Xanthoceras, large grain broad bean and so on 1000 200; other: sweet potato chips, rice shell clam grain and rice grain inspection 500 ~ 1000. The following two methods are common methods for food screening.
Electric filter method: According to the quality standards specified in the sieve layer set (large hole sieve in the small hole sieve in the next, set the screen bottom), according to the provisions of the sample was weighed into the sieve, cover the sieve lid, put On the electric filter, turn on the power, turn on the switch, select the screen automatically to the left and right each sieve 1min (110 to 120 revolutions per minute), after a few moments of the screen, the sieve and the sieve are poured into the analysis Disk. The particles stuck in the middle of the mesh are sieved. Among them, the electric filter is a DSX type electric filter produced by Top Instruments, which is developed according to the GB5494-85 "National Standard for Inspection of Impurities and Imperfect Grains of Grain Oils". The DSX type computer filter is widely used for the screening and determination of grain and oil, and is a screening and grading equipment necessary for agricultural breeding.
Hand sifting method: According to the above method, the sieve layer is covered, poured into the sample, and the cover is covered. The screen is then placed on a glass plate or a smooth table top, and the screens are moved clockwise and counterclockwise for 1 minute with both hands at a speed of 110 to 120 times per minute. The range of the sieve is controlled by the diameter of the sieve to be enlarged by 8 to 10 cm. The operation after the screening is the same as the above method.
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