Appearance Yellow crystalline powder
Identification (1),(2),(3) should comply
PH 2.0-3.0
Specific Absorbance 300~335 at 349nm
Specific optical rotation -105°~ -120°
Light absorbing impurities 0.07 max at 490nm
Related substances (1)β-epidoxycycline ≤2.0%
(2) melacycline ≤2.0%
(3) Any other impurity ≤0.5%
Ethanol 4.3-6.0%
metals 50ppm max
Sulphate ash 0.4% max
Water 1.4~2.8%
Assay 88.0-94.0%
based on anhydrous ethanol-free substance