| ≥1 piece |
| Test item | Standard |
| Appearance | White or slightly Cream powder |
| Loss on drying | <1.0% |
| Assay | Levodopa >98%-101% |
| Sulphated ash | <0.1% |
| Heavy metals | <10ppm |
| Absorbance | 137 - 147 |
| Acidity or alkalinity PH | 4.5 - 7.0 |
| Optical rotation | –1.27°~ –1.34° |
| Identification | Positive |
| Solubility | Conforms |
| Colour of solution | Conforms |
| Organic volatile impurity | Conforms |
| Related substances | Conforms |