Hóa chất L-Cystine cho phân tích hóa sinh Merck 1028371000 (C₆H₁₂N₂O₄S₂, Chai nhựa 1kg) DEEP52 https://yeuhangduc.vn/

CAS number: 56-89-3

EC number: 200-296-3

Hill Formula: C₆H₁₂N₂O₄S₂

Molar Mass: 240.30 g/mol

Assay (bromatometric, calculated on dried substance): 99.0 - 101.0 %

Identity (IR-spectrum): passes test

Appearance: white to almost white, fine-crystalline powder

Appearance of solution (100 g/l, hydrochloric acid  2 mol/l): clear and not more intense in color than reference solution Y₇

Spec. rotation (α 20/D, 20 g/l, hydrochloric acid 1 mol/l, previously dried substance): -225 to -215

Chloride (Cl): ≤ 200 ppm

Sulfate (SO₄): ≤ 500 ppm

Heavy metals (as Pb): ≤ 10 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): ≤ 5 ppm

Zn (Zinc): ≤ 5 ppm

Ninhydrin - positive substances (LC) (largest single impurity): ≤ 0.2 %

Ninhydrin - positive substances (LC) (Sum of all impurities): ≤ 0.5 %

NH₄ (Ammonium): ≤ 0.01 %

Loss on drying (105 °C; 3 h): ≤ 0.2 %