The industrial production methods of L-threonine mainly include: synthesis method, fermentation method and protein hydrolysis method. Fermentation production is now advocated.
White crystal or crystalline powder, odorless, slightly sweet, easily soluble in water, insoluble in methanol and ethanol.
It is mainly used as a nutritional supplement. It can be used as a heat source with glucose to produce caramel and chocolate aromas. It has a flavoring effect and can also be used in biochemical research. Since threonine is an essential amino acid, it is often added to poultry feed. It can also be used as a nutritional additive to prepare amino acid infusions and comprehensive amino acid preparations.
| Items | Index |
| Assay% | 98.5Min |
| Loss on drying% | 1.0% Max |
| Heavy metals（ppm） | 20Max |
| Arsenic（As） | 2mg/kg Max |
| Residue on ignition% | 0.5%Max |
| Specific Rotation | -29.0°- -32.3° |
