| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | White to off-white, odorless crystalline powder | Confirms |
| Solubility | Slightly soluble in water, freely soluble in 3N HCL, insoluble in ethanol. | Confirms |
| Identification | IR: The sample comparing with the spectrum obtained with standard | Confirms |
| RT: The chromatogram RT of sample comparing with the obtained of levodopa standard | Confirms | |
| Specific rotation | -160°~-167° | -162.5° |
| Loss on drying | ≤0.50% | 0.44% |
| Residue on ignition | ≤0.10% | 0.05% |
| Related compounds | Levodopa related compound A≤0.10% | Undetected |
| L-Tyrosine ≤0.10% | Undetected | |
| Levodopa related compound B≤0.50% | 0.01% | |
| L-Veratrylglycine ≤0.10% | Undetected | |
| Unknown impurities ≤0.10% | 0.02% | |
| Total impurities ≤1.10% | 0.13% | |
| Residual solvents | Methanol ≤3000ppm | Below LOD |
| Assay | 98.0% ~102.0% | 99.1% |
| Conclusion: The Product Conforms to USP. |
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