| Item | Specifications |
| Appearance | White crystals or crystalline powder |
| Active content: | Min. 98% |
| Assay, % | 98.5101.5 |
| Identification | Infrared absorption |
| Specific optical rotation | +22.4+24.7 |
| pH value | 5.6~6.1 |
| Loss on drying,% | 0.30 |
| Residue on ignition,% | 0.4 |
| Chloride, % | 0.05 |
| Sulphate(SO4 | 0.03 |
| Iron ,% | 0.003 |
| Heavy metals ,% | 0.0015 |