Characteristics  
A yellow crystalline powder
Identification In accordance with the requirement or BP

Ph 4.5-7.5
Specific optical rotation -203 to -216
Absortance 290-310
Light-absorbing impurities  430nm A<0.25490nm A<0.20
Related substances  4-Epioxytetracyclin <0.5%Tetracycline <2.0%

Heavy metals <0.005%
Water 6.0-9.0%
Sulphated ash <0.5%
Assay >98.0%