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CAS No.: 73-22-3
Molecular formular: C11H12N2O2
Molecular weight: 204.23
L-Tryptophan | AJI92 | USP40 | EP6.0 |
Description | White to yellowish white crystals or crystalline powder | / | White or almost white,crystalline or amorphous powder |
Identification | Conform | Conform | Conform |
Solubility | / | / | Sparingly soluble in water, slightly soluble in ethanol(96 percent). It dissolves in dilute solutions of mineral acids and alkali hydroxides. |
Appearance of solution | / | / | The solution is clear and not more intensively coloured than reference solution BY6 |
Assay | 98.5%~100.5% | 98.5%~101.5% | 98.5%~101.0% |
pH | 5.4～6.4 | 5.5~7.0 | / |
Transmittance | ≥95.0% | / | / |
Loss on drying | ≤0.20% | ≤0.3% | ≤0.5% |
Residue on ignition | ≤0.10% | ≤0.1% | ≤0.1% |
Chloride | ≤0.020% | ≤0.05% | ≤200ppm |
Heavy Metals | ≤10ppm | ≤15ppm | ≤10ppm |
Iron | ≤20ppm | ≤30ppm | ≤20ppm |
Sulfate | ≤0.020% | ≤0.03% | ≤300ppm |
Ninhydrin-positive substances (TLC) | / | / | Conform |
Arsenic | ≤1ppm | / | / |
Ammonium | ≤0.02% | / | ≤200ppm |
Other amino acids | Meet the requirements | / | / |
Pyrongen | Conform | / | / |
Specific Rotation | -30.0° ～ -32.5° | -29.4°~ -32.8° | -30.0°～-33.0° |
Organic impurities | / | Conforms | / |
Manufacturing
