Chemaster international inc. Specializes in research and and manufacture of
Azithromycin dihydrate, cetiricene dichlorhydrate, phenylephrine hydrochloride, clindamycin HCl

Azithromycin dihydrate
Description white or almost white powder
Solubility practically insoluble in water, freely soluble in ethanol and methylene chloride.
Identifiation
A) IR spectrum conforms to azithromycin RS
B) rt HPLC conforms to azithromycin RS
Specific rotation between -45° And -49°
Crystallinity meets the requirements
pH between 9.0 and 11.0
Water between 4.0% to 5.0%
Residue on ignition not more than 0.3%
Heavy metals not more than 25ppm
Assay not less than 945ug and not more than 1030ug of azithromycin (c38h72n2o12) per mg, calculated on the anhydrous basis
Methanol not more than 0.3%
Ethanol not more than 0.05%
Acetone not more than 0.5%
Chloroform not more than 0.06%