CAS No.38821-49-7
Shelf life:3 years
The detailed specifications are as below:
| Items | Standard |
| Appearance | A white or creamy white powder |
| Identification
| IR:IR spectrum is consistent with carbidopa CRS |
| 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% |
| Heavy metals | ≤0.001% |
| Limit of methyldopa and carbidopa related components A | Methyldopa:≤0.5% Carbidopa related components A:≤0.5% Any unknown impurity:≤0.10% Total impurities:≤1.0% |
| Residual solvents | Ethanol:≤0.10% |
| Assay | 98.0%~102.0% |
| Particle size | NLT90% pass 100mesh |