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: 2026-04-24 14:58:52
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. |
Computed Descriptors for DL-Cystine
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