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 %