DL-Cystine Chemical Properties

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

LogP

-4.340 (est)

CAS DataBase Reference

923-32-0(CAS DataBase Reference)

NIST Chemistry Reference

Dl-cystine(923-32-0)

Safety Information

Hazard Codes 

Xn,Xi

Risk Statements 

36/37/38-22

Safety Statements 

37/39-26-24/25-36

WGK Germany 

3

HS Code 

29309014

MSDS

• Language:English Provider:DL-Cystine
• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS

DL-Cystine Usage And Synthesis

Chemical Properties

white to off-white powder

Uses

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.

Uses

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

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.

Definition

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

Synthesis Reference(s)

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

DL-Cystine(923-32-0)Related Product Information

• DL-Homocysteine
• L(-)-CYSTINE BIOSYNTH,L-CYSTINE, REAGENT GRADE, SIGMA GRADE,L-Cystine,99%,L-CYSTINE, REAG.,L-CYSTINE FREE BASE BIOTECHNOLOGY*PERFOR,L-CYSTINE,FCC
• DL-Cysteine
• L-Cysteine
• Cyproterone acetate
• D-PENICILLAMINE DISULFIDE
• DL-CYSTINE HYDROCHLORIDE
• N,N'-Bis(benzyloxycarbonyl)-L-cystine
• L-Cystine Dimethyl Ester 2HCl,L-CYSTINE DIMETHYL ESTER DIHYDROCHLORIDE, >=95%
• L-Cystine hydrochloride
• MESO-CYSTINE
• N,N’-di-Boc-L-cystine
• D-CYSTINE CRYSTALLINE
• N,N-Dibenzoyl-L-Cystine>96%
• L-CYSTINE DIHYDROCHLORIDE SYNTHETICALLY DERIVED,L-CYSTINE DIHYDROCHLORIDE SALT,Cystine2HCl,L-,L-Cystine dihydrochloride, non-animal source, cell culture tested
• SELENO-DL-CYSTINE,SELENIUM-DL-CYSTINE
• L-CYSTINE DI-B-NAPHTHYLAMIDE FREE BASE
• N,N'-BIS(TRIFLUOROACETYL) L-CYSTINE