| ITEMS | SPECIFICATIONS | RESULT |
|---|---|---|
| Appearance | White crystalline powder | Conform |
| Assay of Threonine | 99.0 – 100.0% | 99.50% |
| Specific rotation | -26.7 to -29.1 | -28.2 |
| Loss on drying | 0.2% Max. | 0.12% |
| Chloride | 0.05% Max. | 0.03% Max. |
| Ammonium | 0.02% Max. | Conform |
| Sulphate | 0.03% Max. | Conform |
| Iron | 10 ppm Max. | Conform |
| Heavy metals | 10 ppm Max. | Conform |
| Arsenic | 1 ppm Max. | 0.1 ppm |
| Residue on ignition | 0.4% Max. | 0.22% |
| pH | 5.0 - 6.5 | 5.8 |
| Organic volatile impurities | Meets the requirement | Conform |