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| Item | Specifications |
|---|---|
| Specific rotation | +39.5 to +41.5° |
| State of solution (transmittance) | Clear 98.0% min. |
| Chloride [Cl] | 0.020% max. |
| Ammonium [NH4] | 0.02% max. |
| Sulfate [SO4] | 0.020% max. |
| Iron [Fe] | 10 ppm max. |
| Heavy metals [Pb] | 10 ppm max. |
| Arsenic [As2O3] | 1 ppm max. |
| Other amino acids | Chromatographically not detectable |
| Loss on drying | 0.20% max. |
| Residue on ignition [sulfated] | 0.10% max. |
| Assay | 99.0% min. |