Appearance : a white or yellow-white powder
Indentification:
IR:conform with spectrum of USP Carbidopa Reference standard
HPLC:conform with the retention time of the major peak in the chromatogram.
Specific rotation: -21.0°~-23.5°calculated as the monohydrate
Loss on drying:6.9-7.9%
Residue on ignition:0.1% max.
Heavy Metal:0.001%max.
Relate compounds: Methyldopa≤0.50%
Carbidopa related compenents A≤0.50%
Any unknown impurity≤0.10%
Residual solvents: ≤0.01% in dichloromethane
≤0.10% in ethanol
OVI:not be used in manufacture
Assay:98.0-102.0%