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 %