1.02837

L-Cystine

for biochemistry

• Synonym(s): L-Cystine, Cys
• Empirical Formula (Hill Notation): C₆H₁₂N₂O₄S₂
• CAS Number: 56-89-3
• Molecular Weight: 240.30
• MDL number: MFCD00064228
• UNSPSC Code: 12352209
• EC Index Number: 200-296-3
• NACRES: NA.21

Properties

• Quality Level: 100
• form: solid
• mp: 261-262 °C (decomposition)
• solubility: insoluble 0.19 g/L
• density: 1.677 g/cm³ at 20 °C
• bulk density: 300 kg/m³
• storage temp.: 2-30°C
• SMILES string: S(SC[C@H]([N+H3])C(=O)[O-])C[C@H]([N+H3])C(=O)[O-]
• InChI: 1S/C6H12N2O4S2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1
• InChI key: LEVWYRKDKASIDU-IMJSIDKUSA-N

Description

Analysis Note

Assay (bromatometric, calculated on dried substance): ≥ 99.0 %
Identity (IR-spectrum): passes test
Appearance: white to almost white, fine-crystalline powder
Appearance of solution (0.2 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): -220.0 to - 225.0
Chloride (Cl): ≤ 0.02 %
Sulfate (SO₄): ≤ 0.05 %
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 %
Zn (Zinc): ≤ 0.0005 %
NH₄ (Ammonium): ≤ 0.01 %
Foreign amino acids: ≤ 0.3 %
Other ninhydrine positive substances: ≤ 0.3 %
Loss on drying (105 °C; 3 h): ≤ 0.3 %

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable