1. Identification: Infrared absorption

2. Specific rotation[a]25°: -26.7°~-29.1°

3. PH: 5.0~6.5

4. Loss on drying: ≤0.2%

5. Residue on ignition: ≤0.4%

6. Chloride: ≤0.05%

7. Sulfate: ≤0.03%

8. Iron: ≤0.003%

9. Heavy metals: ≤0.0015%

10. Organic volatile impurities: Meets the requirements

11. Assay: 98.5~101.5%

Threonine