(1) Take a small amount of Qingdai, burn it with a slight fire, and there will be purple-red smoke.
(2) Take a small amount of Qingdai and add nitric acid dropwise to produce bubbles and appear brownish red or yellowish brown.
(3) Take 50 mg of Qingdai, add 5 ml of chloroform, stir thoroughly, filter, and the filtrate is used as the test solution. In addition, the indigo reference substance and the indirubin reference substance were added, and chloroform was added to make a mixed solution containing 1 mg per lml as a reference substance solution. According to the thin layer chromatography test, draw 5 to 10 μl of each of the above two solutions, respectively, and spot them on the same silica gel G thin layer plate, using benzene-chloroform-acetone (5: 4: 1) as the developing agent, unfold and remove To dry. In the chromatogram of the test product, at the corresponding position of the chromatogram of the reference product, the same blue and light purple spots are shown.
Shanghai Ruiqi Biological Technology Co., Ltd. specializes in providing various reference products, with a complete range of products and competitive prices. 
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