DL-Cystine

Synonym(s):(R,R)-3,3′-Dithiobis(2-aminopropionicacid);(±)-3,3′-Dithiobis(2-aminopropionicacid);L-Cystine

CAS NO.：923-32-0
Empirical Formula: C6H12N2O4S2
Molecular Weight: 240.3
MDL number: MFCD00084652
EINECS: 213-094-5
SAFETY DATA SHEET (SDS)
Update Date: 2024-11-08 10:59:09

What is DL-Cystine?

Chemical properties

white to off-white powder

The Uses of DL-Cystine

DL-cystine is used in the preparation of sulfur-containing dimeric and monomeric surfactants.

The Uses of DL-Cystine

Cystine is a nonessential amino acid that acts as a nutrient and dietary supplement. It is very slightly soluble in water and in alcohol. it improves the biological quality of the total protein in foods containing naturally occurring intact protein.

What are the applications of Application

DL-Cystine is a racemic mixture of the proteinogenic amino acids L-cystine and the non-proteinogenic D-cystine

Definition

ChEBI: A sulfur-containing amino acid obtained by the oxidation of two cysteine molecules which are then linked via a disulfide bond.

Definition

cystine: A molecule resulting fromthe oxidation reaction between thesulphydryl (-SH) groups of two cysteine molecules .This often occurs between adjacentcysteine residues in polypeptides.The resultant disulphide bridges(-S-S-) are important in stabilizingthe structure of protein molecules.

Synthesis Reference(s)

Tetrahedron Letters, 31, p. 5007, 1990 DOI: 10.1016/S0040-4039(00)97790-6

Properties of DL-Cystine

Melting point:	227 °C (dec.)(lit.)
Boiling point:	468.2±45.0 °C(Predicted)
Density	1.358 (estimate)
refractive index	1.6000 (estimate)
storage temp.	Keep in dark place,Inert atmosphere,Room temperature
solubility	1 M HCl: soluble
form	Powder
pka	2.1(at 35℃)
color	White
Water Solubility	Soluble in dilute acid and alkali solution, highly soluble in water, not soluble in alcohol.
Merck	14,2782
BRN	1728095
CAS DataBase Reference	923-32-0(CAS DataBase Reference)
NIST Chemistry Reference	Dl-cystine(923-32-0)

Safety information for DL-Cystine

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P270:Do not eat, drink or smoke when using this product. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P312:Call a POISON CENTER or doctor/physician if you feel unwell. P330:Rinse mouth. P302+P352:IF ON SKIN: wash with plenty of soap and water. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P403+P233:Store in a well-ventilated place. Keep container tightly closed.