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1.02837

L-Cystine

Name: L-Cystine
Brand: MM

for biochemistry

Synonym(s):

L-Cystine, Cys

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About This Item

Empirical Formula (Hill Notation):

C₆H₁₂N₂O₄S₂

CAS Number:

56-89-3

Molecular Weight:

240.30

UNSPSC Code:

12352209

EC Index Number:

200-296-3

NACRES:

NA.21

MDL number:

MFCD00064228

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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 %

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Storage Class

11 - Combustible Solids

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c