Customization: | Available |
---|---|
CAS No.: | 73-22-3 |
Formula: | / |
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Name | L-tryptophan |
Appearance | White crystal or crystalline powder |
CAS NO. | 73-22-3 |
EINECS NO. | 200-795-6 |
Molecular weight | 204.2252 |
Melting point | 280-285ºC |
Boiling point | 447.9°C at 760 mmHg |
Density | 8.3E-09mmHg at 25°C |
Flash point | 224.7°C |
Item | FCCIV | AJI92 | USP32 |
Appearance | White to slightly yellow crystal or crystalline powder | White to slightly yellow crystal or crystalline powder | --- |
Assay(on dry basis) | 98.5% ~ 101.5% | 99.0% ~ 100.5% | 98.5% ~ 101.5% |
PH Value | --- | 5.4 ~ 6.4 | 5.5 ~ 7.0 |
Specific rotation | -30.0° ~ -33.0° | -30.0° ~ -32.5° | -29.4° ~ -32.8° |
Transmittance | --- | ≥95.0% | --- |
Chloride(as Cl) | --- | ≤0.02% | ≤0.05% |
Ammonium(as NH4) | --- | ≤0.02% | --- |
Sulfate(as SO4) | --- | ≤0.02% | ≤0.03% |
Iron(as Fe) | --- | ≤0.002% | ≤0.003% |
Heavy metals(as Pb) | ≤0.002% | ≤0.001% | ≤0.0015% |
Other amino acids | --- | conform | --- |
Loss on drying | ≤0.3% | ≤0.2% | ≤0.3% |
Residue on ignition | ≤0.1% | ≤0.1% | ≤0.1% |
Item | Specifications | |
Assay | ≥98.5% | 9.0% ~ 12.0% |
Specific Rotation | -30.0° ~ -33.0° | --- |
Loss on drying | ≤0.5% | ≤10% |
Residue on ignition | ≤0.5% | --- |
Heavy metal(as Pb) | ≤20 mg/kg | ≤10 mg/kg |
Coliform group | --- | ≤5000 mpn |
Salmonellas | --- | Absent |
Item | USP32 |
Assay(on dry basis) | 98.5% ~ 101.5% |
PH Value | 5.5 ~ 7.0 |
Specific rotation | -29.4° ~ -32.8° |
Chloride(as Cl) | ≤0.05% |
Sulfate(as SO4) | ≤0.03% |
Iron(as Fe) | ≤0.003% |
Heavy metals(as Pb) | ≤0.0015% |
Loss on drying | ≤0.3% |
Residue on ignition | ≤0.1% |