China Amino Acid CAS No 73-22-3 L-Tryptophan, Tryptophan, Find details about China Tryptophan, L-Tryptophan from Amino Acid CAS No 73-22-3 L-Tryptophan, Tryptophan
Tests | Limits | Test results |
Description | White to slightly yellowish-white crystals or crystalline powder | conforms |
| Identification(IR) | concordant with the reference spectrum | conforms |
| Solubility | Soluble in hot alcohol and in dilute hydrochloric acid. | conforms |
| Assay(on dried basis) | 98.5~101.5% | 99.3% |
| PH | 5.5~7.0 | 5.7 |
| Specific rotation[a]D 25 | -29.4°~-32.8° | -32.3° |
| Chloride(Cl) | ≤0.05% | <0.05% |
| Sulfate(SO4) | ≤0.03% | <0.03% |
| Iron(Fe) | ≤30ppm | <30ppm |
Organic impurities | Total impurities 1≤0.01% Total impurities 2≤0.03% Tryptophan related compound A ≤10ppm | conforms |
| Loss on drying | ≤0.30% | 0.08% |
| Residue on ignition | ≤0.10% | 0.02% |
Conclusion: Passed Standard of USP41. | ||