| Assay (perchloric acid titration, calculated on dried substance) | 99.0 - 101.0 % |
| Identity (IR-spectrum) | passes test |
| Identity (specific rotation) | passes test |
| Appearance | white to almost white crystalline powder or colorless crystals |
| Appearance of solution (20 g/l, CO₂-free water) | clear and colorless |
| Spec. rotation (α 20/D, 100 g/l, hydrochloric acid 3 mol/l, calc. on dried substance) | +33.7 to +36.0 |
| Chloride (Cl) | ≤ 200 ppm |
| Sulfate (SO₄) | ≤ 200 ppm |
| As (Arsenic) | ≤ 5 ppm |
| Ca (Calcium) | ≤ 10 ppm |
| Co (Cobalt) | ≤ 5 ppm |
| Fe (Iron) | ≤ 5 ppm |
| K (Potassium) | ≤ 5 ppm |
| Mg (Magnesium) | ≤ 5 ppm |
| Na (Sodium) | ≤ 50 ppm |
| Pb (Lead) | ≤ 10 ppm |
| Zn (Zinc) | ≤ 5 ppm |
| Ninhydrin-positive substances (LC)(Aspartic acid) | ≤ 0.5 % |
| Ninhydrin-positive substances (LC)
(any other ninhydrin-positive impurity) | ≤ 0.3 % |
| Ninhydrin-positive substances (LC) (ammonium (570 nm)) | ≤ 0.02 % |
| Ninhydrin-positive substances (LC)
(total impurities) | ≤ 0.8 % |
| Loss on drying (130 °C, 3 h) | 10.5 - 12.5 % |
