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CAS No.: 72-19-5
Molecular formular: C4H9NO3
Molecular weight: 119.12
L-Threonine | EP6 | AJI92 | USP40 |
Description | White or almost white,crystalline powder or colourless crystals | White crystals or crystalline powder | / |
Solubility | Soluble in water, practically insoluble in alcohol. | / | / |
Identification test (A,B） | Conforms | Conforms | Conforms |
Appearance of solution | Solution S is clear and colourless | / | / |
Assay | 99.0-101.0% | 99.0%～100.5% | 98.5%～101.5% |
pH | / | 5.2~6.2 | 5.0~6.5 |
Transmittance | / | ≥98.0% | / |
Loss on drying | ≤0.5% | ≤0.20% | ≤0.2% |
Residue on ignition | ≤0.1% | ≤0.10% | ≤0. 4% |
Ninhydrin-positive substances (TLC) | Conforms | / | / |
Chloride | ≤200ppm | ≤0.020% | ≤0.05% |
Heavy Metals | ≤10ppm | ≤10ppm | ≤15ppm |
Iron | ≤10ppm | ≤10ppm | ≤0.003% |
Sulfate | ≤300ppm | ≤0.020% | ≤0.03% |
Arsenic | / | ≤1ppm | / |
Ammonium | ≤200ppm | ≤0.02% | / |
Other amino acids | / | Conforms | Conform |
Pyrongen | / | Conforms | / |
Specific Rotation | -27.6°～-29.0° | -27.6°~ -29.0° | -26.7°~-29.1° |
Manufacturing
