Chemical identification
(1) Take 0.5g of the product powder, add 5ml of normal saline, and boil for 2min in a water bath. Take the filtrate 2ml, add 2% red blood cell saline suspension 2ml, shake, visible hemolysis phenomenon. (Check saponins)
(2) Take 2g of the product powder, add methanol 15ml, soak overnight and filter. Take the filtrate 1ml, add a few drops of potassium ferricyanide-ferric chloride reagent, blue. (Check phenols and tannins)
(3) Take (2) methanol extract concentrated to about 4ml, take the concentrate 1ml, add a few drops of concentrated hydrochloric acid and a little zinc powder, heated in a boiling water bath, showed cherry red. (Check flavonoids)
(4) Take 1g of powder, add 10ml of water and warm immerse at 60°C for 1h, filter, take 3 drops of each filtrate, divide the two tubes, add a 0.1mol/L hydrochloric acid solution 5ml in one tube, add 0.1 in another tube. 5 ml of mol/L sodium hydroxide solution, shaken vigorously for 1 min, the alkali liquid tube foam is more than double the acid liquid tube foam.
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