This standard applies to the inspection of the processing precision of commercial rice grains. GB/T 5502-1985 Inspection of grains and oilseeds Inspection method for rice processing precision GB/T5502-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Inspection of grain and oilseedsMethodsfordeterminationof processingdegrees of rice and other grain kernelsThis standard applies to the inspection of processingdegrees of commodity rice. 1 Inspection of rice precision
1.1 Direct comparison method
GB/T5502-85
Weigh 50g of the sample from the average sample and compare it directly with the precision standard sample. The grade that meets the standard sample is determined. 1.2 Staining method
1.2.1 Apparatus and equipment
1.2.1.1 Evaporated blood or cultured blood;
1.2.1.2 Balance: sensitivity 0.1g, 0.01g1.2.1.3 Measuring cylinder: 25ml;
Electric constant temperature water bath:
1.2.1.5 Narrow-necked bottle: 100ml, 1000ml;1.2.1.6 Glass rod, etc.
1.2.2 Reagents
1.2.2.10.1% carbolic acid solution: Weigh 0.5g carbolic acid, add 10ml 95% ethanol, then add 1g basic fuchsin, and after dissolving, dilute with water to 500ml, mix thoroughly, and store in a brown bottle for later use. 1.2.2.21.25% sulfuric acid solution: Use a measuring cylinder to take 7.2ml of concentrated sulfuric acid with a specific gravity of 1.84 and a concentration of 95%, and inject it into a container containing 400-500ml of water, then add water to dilute it to 1000ml for use. 1.2.2.3 Sudan-III ethanol solution: Take about 0.4g of Sudan-III in 100ml of 95% ethanol to make a saturated solution. 1.2.3 Operation method
1.2.3.1 Fuchsia carbolic acid solution staining method
Weigh 20g of the standard sample and test sample respectively, count out 50 whole rice grains without selection, put them into two evaporation bloods respectively, and wash off the floating bran with clean water. Pour out the clean water, inject a few milliliters of fuchsia carbolic acid solution into each, submerge the rice grains, and soak for about 20s. After the rice grains are colored, pour out the staining solution, wash them with clean water 2-3 times, and fill with clean water. Rinse twice with 1.25% sulfuric acid solution, each time for about 30 seconds, pour out the sulfuric acid solution, wash with clean water 2-3 times, and compare the degree of skin retention according to the color. The skin part of the rice grain is reddish purple, and the endosperm part is light reddish white.
1.2.3.2 Sudan-III ethanol solution staining method Count 50 whole rice grains according to the above method, immerse the rice grains with Sudan-III ethanol saturated solution, and then place them in a 70-75℃ water bath for about 5 minutes to color the rice grains. Then pour out the staining solution and wash off the excess pigment with 50% ethanol. The cortex and germ are red, and the endosperm part is not colored.
2 Sorghum rice precision inspection
2.1 Instruments and utensilsbzxZ.net
2.1.1 Balance: sensitivity 0.1g, 0.01g; 2.1.2 Analysis plate;
2.1.3 Magnifying glass, tweezers, etc.
2.2 Operation method
Take 20g (W) of the sample from the average sample, identify each grain according to the quality standard, and separate the milky white grains from it and weigh them (W1).
2.3 Result calculation
The processing accuracy of sorghum rice is expressed by the content of milky white grains in the rice. The milky white grain content is calculated according to the following formula:
Milky white grains (%)=
W——sample weight, g.
-×100
The allowable difference between the two test results shall not exceed 1.0%. The average is the test result. The test result is taken to the first decimal place.
3 Other rice precision inspection
The processing accuracy of millet, sorghum, millet and other rice types is checked against the standard sample. Additional instructions,
This standard is proposed by the Ministry of Commerce of the People's Republic of China. This standard was drafted by the Grain Storage and Transportation Bureau of the Ministry of Commerce. The main drafters of this standard are Gao Xiuwu, Yang Haoran, Wu Yanxia and Lv Guifen.
Published by the National Bureau of Standards on November 2, 1985
Implemented on July 1, 1986
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