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 (50 g/l CO₂-free water): clear and colorless

Spec. rotation (α 20/D, 110 g/l, hydrochloric acid 120 g/l, calc. on dried substance): +9.2 to +10.6

Sulfate (SO₄): ≤ 0.02 %

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): ≤ 0.005 %

NH₄ (Ammonium): ≤ 0.01 %

Zn (Zinc): ≤ 0.0005 %

Foreign amino acids: ≤ 0.3 %

Other ninhydrine positive substances: ≤ 0.1 %

Loss on drying (150 °C): 7.0 - 10.0 %