Molecular Formula: C9H11NO3
Molecular Weight: 181.19
CAS No： 60-18-4
| L-Tyrosine | CP2020 | EP11 | USP2023 | AJI92 |
| Assay | ≥99.0% | 99.0-101.0% | 98.5-101.5% | 99.0-100.5% |
| PH | 5.0-6.5 | / | / | 5.0-6.5 |
| Specific rotation[a]D20 | -11.3°--12.1° | -11.0°--12.3° | / | -11.3°--12.1° |
| Specific rotation[a]D25 | / | / | -9.8°--11.2° | / |
| Transmittance(T430) | ≥95.0% | / | / | ≥95.0% |
| Appearance of solution | / | clear & colorless≤Y7 | / | / |
| Chloride(Cl) | ≤0.02% | ≤0.02% | ≤0.04% | ≤0.02% |
| Ammonium(NH4) | ≤0.02% | ≤0.02% | / | ≤0.02% |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.04% | ≤0.02% |
| Iron(Fe) | ≤10PPM | ≤10PPM | ≤30PPM | ≤10PPM |
| Heavy metals(Pb) | ≤10PPM | / | / | ≤10PPM |
| Arsenic | ≤1PPM | / | / | ≤1PPM |
| Other amino acids | ≤0.40% | / | Individual impurities≤0.5% Total impurities≤2.0% | conform |
| Ninhydrin-positive substances | / | Impurity A≤0.5% Each impurity≤0.2% Sum of impurities≤0.6% | / | / |
| Loss on drying | ≤0.20% | ≤0.50% | ≤0.30% | ≤0.20% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.40% | ≤0.10% |
| Total plate count | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g |
| Moulds & Yeasts | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g |
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