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Physical properties
Source:未知 Release Time:2011-12-25 23:12
Physical properties High content of ursolic shiny prismatic ( ethanol ) or hair -like needle-like crystals ( dilute ethanol) , low content of brown or yellow-green powder with special smell , is present in a natural plant types of pentacyc
Physical properties
High content of ursolic shiny prismatic (ethanol) or hair-like needle-like crystals (dilute ethanol), low content of brown or yellow-green powder with special smell, is present in a natural plant types of pentacyclic triterpenoids. Melting point 283 ~ 288 ℃. Specific Rotation [α] D25 +67.5 ° (C = 1,1 mol / L potassium hydroxide alcohol solution). At 15 ℃, ethanol (99%) 1 ml soluble 10 mg, 45 mg of soluble boiling 1 ml. Still soluble in methanol, acetone, pyridine, insoluble in water and petroleum ether.
High content of ursolic shiny prismatic (ethanol) or hair-like needle-like crystals (dilute ethanol), low content of brown or yellow-green powder with special smell, is present in a natural plant types of pentacyclic triterpenoids. Melting point 283 ~ 288 ℃. Specific Rotation [α] D25 +67.5 ° (C = 1,1 mol / L potassium hydroxide alcohol solution). At 15 ℃, ethanol (99%) 1 ml soluble 10 mg, 45 mg of soluble boiling 1 ml. Still soluble in methanol, acetone, pyridine, insoluble in water and petroleum ether.
