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L-Tryptophan
| ITEMS | LIMIT |
| State of solution | Not Less Than 98.0% |
| (Transmittance) | |
| PH | 5.5~6.5 |
| Specific rotation [α]D20° | -30.0~-32.5. |
| Ammonnium(NH4) | Not More Than 0.02% |
| Chloride content | Not More Than 0.02% |
| Sulfate(SO4) | Not More Than 0.02% |
| lron(Fe) | Not More Than 0.002% |
| Heavy metals(as Pb) | Not More Than 0.001% |
| Arsenic (As2O3) | Not More Than 0.0001% |
| Loss on drying | Not More Than 0.2% |
| Resdue on ignition | Not More Than 0.1% |
| Foreign amino acids | Not More Than 0.5% |
| Pyrogen* | Free |
| Assay (dry basis) | 99.0~101.0% |
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