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30200 Sigma

L-Cystine

≥99.7% (TLC)

Synonym: (R,R)-3,3′-Dithiobis(2-aminopropionicacid)

  • CAS Number 56-89-3

  • Linear Formula [-SCH2CH(NH2)CO2H]2

  • Molecular Weight 240.30

  •  Beilstein Registry Number 1728094

  •  EC Number 200-296-3

  •  MDL number MFCD00064228

  •  eCl@ss 32160406

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Properties

Related Categories Allium cepa (Onion), Allium sativum (Garlic), Aloe Vera, Amino Acids & Derivatives, Amino acids,
InChI Key   LEVWYRKDKASIDU-IMJSIDKUSA-N
assay   ≥99.7% (TLC)
optical activity   [α]20/D −219±5°, c = 1% in 1 M HCl
ign. residue   ≤0.1% (as SO4)
loss   ≤0.1% loss on drying
mp   >240 °C (dec.)(lit.)
solubility   1 M HCl: soluble0.5 g/10 mL, clear, colorless
anion traces   chloride (Cl-): ≤500 mg/kg
  sulfate (SO42-): ≤100 mg/kg
cation traces   Ca: ≤50 mg/kg
  Cd: ≤5 mg/kg
  Co: ≤5 mg/kg
  Cr: ≤5 mg/kg
  Cu: ≤6 mg/kg
  Fe: ≤10 mg/kg
  K: ≤50 mg/kg
  Mg: ≤5 mg/kg
  Mn: ≤5 mg/kg
  Na: ≤150 mg/kg
  Ni: ≤5 mg/kg
  Pb: ≤5 mg/kg
  Zn: ≤5 mg/kg

Description

Other Notes

Preparation of N,N′-dibenzoyl-L-cystine, an efficient auxiliary for enantioselective reductions of ketones

Application

L-Cystine has been used to prepare stock solution which in turn is utilized for determining the L-cysteine and L-cystine in pharmaceutical preparations as well as in urine samples by using spectrofluorimetric flow injection method.

Biochem/physiol Actions

Cystine is required for the synthesis of glutathione that protects the cells from oxidative stress. A specific x(c)-cysteine/glutamate antiporter mediates cellular uptake of cysteine in exchange for glutamate. Inhibition of cysteine uptake induces toxicity in neuronal cells.

Price and Availability


All labs need water
Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
1
Protocols & Articles
Peer-Reviewed Papers
15

References

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