Baicalin Huangqin Baicalin WS1—XG—2002 R=Glucuronic Acid [C21H18O11=446.38] This product, calculated on the dried basis, contains not less than 90.0% of Baicalin (C21H18O11) for injection use, and not less than 83.0% for oral use. 【Description】This product is a light yellow powder with a bitter taste. 【Identification】(1) Take a small amount of this product, dissolve it in 2ml of ethanol, add 2 drops of ferric chloride test solution, and a dirty color appears immediately. (2) Take a small amount of this product, add 2ml of water, dropwise add sodium hydroxide test solution to dissolve, the solution appears orange-yellow; dropwise add dilute acetic acid until the color of the solution basically fades, then add 1 drop of 5% zirconium dioxide solution, the solution appears yellow, and the color does not fade after adding dilute hydrochloric acid. 【Test】Loss on drying Dry this product at 105°C to constant weight; the loss in weight is not more than 3.0% (Chinese Pharmacopoeia 2000 Edition Part II Appendix LXG). 【Assay】Determine in accordance with the high-performance liquid chromatography method (Chinese Pharmacopoeia 2000 Edition Part II Appendix VID). Chromatographic conditions and system suitability test Use octadecylsilane bonded silica as the filler; methanol—water—phosphoric acid (47:53:2.0) as the mobile phase; detection wavelength is 280nm, the number of theoretical plates calculated based on the baicalin peak should not be less than 2500. Preparation of reference and test solutions: Precisely weigh an appropriate amount of baicalin reference substance dried under reduced pressure at 60°C for 6 hours, add methanol to prepare a solution containing 60μg per 1ml as the reference solution; separately, precisely weigh 7mg of this product, place it in a 250ml flask, add an appropriate amount of methanol, reflux extract in a water bath for 30 minutes, cool, transfer to a 100ml volumetric flask, dilute to volume with methanol, mix well as the test solution. Assay method: Precisely inject 1μl each of the reference solution and the test solution into the liquid chromatograph, and determine. 【Storage】: Protect from light, keep dry. 【Validity period】: Tentatively set at 2 years. Former name: Baicalin Mianning Jiexiang Pharmaceutical Raw Material Co., Ltd.