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DL-Tryptophan
CAS RN: 54-12-6
| Solubility in water | Colorless & clear (c=1) |
| Loss on drying | Not more than 0.3% |
| Residue on ignition (as sulfate) | Not more than 0.1% |
| Chloride (Cl) | Not more than 0.02% |
| Sulfate (SO4) | Not more than 0.03% |
| Heavy metals (as Pb) | Not more than 20ppm |
| Iron (Fe) | Not more than 20ppm |
| Ammonium (NH4) | Not more than 0.02% |
| Arsenic (As2O3) | Not more than 1ppm |
| Other amino acids | Not detected by T.L.C.(The spotted amount, 10μg) |
| Assay | 98.5%～101.0% |
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