CAS number： 73-22-3
Molecular formula： C11H12N2O2
molecular weight： 204.2252
Chemical structure：
| Product Name | L-tryptophan | |
| Shelf Life | 2 years | |
| Item | Specifications | Results |
| Appearance | White crystals or crystalline powder | Conforms |
| Specific rotation | -29.4°~ -32.8° | -31.6° |
| PH | 5.5-7.0 | 5.9 |
| Loss on drying | ≤0.3 | 0.07 |
| Residue on ignition | ≤0.10 | 0.06 |
| Chloride (Cl) | ≤0.05 | ＜0.05 |
| Sulfate(SO4) | ≤0.03 | ＜0.03 |
| Irom(Fe) | ≤0.003 | ＜0.003 |
| Heavy metals (Pb) | ≤0.0015 | ＜0.0015 |
| Organic volatile impurities | Meets the requirements | Meets the requirements |
| Assay | 98.5~101.5 | |
| Conclusion: This product conforms to requirements of USP24grade standard. | ||
