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Description ：Should be a white needle-shape crystal or white crystal powder ; give out no smell , no taste ; be easy to lose activity in air or ligh…
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Description ：Should be a white needle-shape crystal or white crystal powder ; give out no smell , no taste ; be easy to lose activity in air or light . Identification： 1. Dissolve about 0.5mg of vitamin D2 into 5ml chloroform, add 0.3ml acetic anhydride and 0.1ml sulfuric acid, shake and mix vigorously. The mixture is initially produced bright red color , and then rapidly changes violet and finally blue to green . 2. The infrared absorption spectroscopy should be in according with spectrum of comparison Examination：Dissolve 10mg of vitamin D2 into 2ml of 90% ethanol, add 2ml solution of digitalis saponin and incubate for 18 hours. No precipitation or cloud should be observed. Melting Range Between 115℃ and 119℃ Specific Rotation Between ＋103゜ and ＋106゜ Solubility Freely soluble in alcohol Reducing Substances <20ppm Ergosterol none OrganicVolatilityImpurities Benzene ≤ 2 p p m Assay Between 97 % and 103 %
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