| Assay (alkalimetric, calculated on dried substance) |
≥ 99.0 % |
| Identity (IR-spectrum) |
passes test |
| Appearance |
white to almost white, crystalline powder or colorless crystals |
| Appearance of solution (0.5 mol/l, hydrochloric acid 1 mol/l) |
clear and colorless |
| Spec. rotation (α 20/D, 50 g/l, hydrochloric acid 1 mol/l, calc. on dried substance) |
+31.5 to +32.5 |
| UV-Absorption (260 nm, 0.5 mol/l, 1 cm, hydrochloric acid 1 mol/l) |
≤ 0.10 |
| UV-Absorption (280 nm, 0.5 mol/l, 1 cm, hydrochloric acid 1 mol/l) |
≤ 0.10 |
| Chloride (Cl) |
≤ 0.02 % |
| Sulfate (SO₄) |
≤ 0.01 % |
| Heavy metals (as Pb) |
≤ 0.001 % |
| As (Arsenic) |
≤ 0.0005 % |
| Ca (Calcium) |
≤ 0.001 % |
| Co (Cobalt) |
≤ 0.0005 % |
| Fe (Iron) |
≤ 0.0005 % |
| K (Potassium) |
≤ 0.0005 % |
| Mg (Magnesium) |
≤ 0.0005 % |
| Na (Sodium) |
≤ 0.01 % |
| NH₄ (Ammonium) |
≤ 0.01 % |
| Zn (Zinc) |
≤ 0.0005 % |
| Foreign amino acids |
≤ 0.3 % |
| Other ninhydrine positive substances |
≤ 0.1 % |
| Loss on drying (105 °C; 3 h) |
≤ 0.3 % |
