Assay (perchloric acid titration, calculated on dried substance): ≥ 99.0 %

Identity (IR-spectrum): passes test

Appearance: white to almost white, fine powder

Appearance of solution (1 mol/l, water): clear and colorless

Spec. rotation (α 20/D, 50 g/l, hydrochloric acid 1 mol/l, calc. on dried substance): +20.3 to +21.3

UV-Absorption(260 nm; 1 mol/l; 1 cm; water): ≤ 0.20

UV-Absorption(280 nm; 1 mol/l; 1 cm; water): ≤ 0.25

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): ≤ 0.005 %

Mg (Magnesium): ≤ 0.0005 %

Na (Sodium): ≤ 0.005 %

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): ≤ 0.4 %