| Formula / Notation | C3H7NO2S |
|---|---|
| CAS Number | 52-90-4 |
| Molecular Weight | 121.16 |
| Melting Point | 240 dec °C |
| Solubility | 277000 mg/L (at 25 °C) |
| Appearance | Colorless or white solid; [HSDB] Colorless crystalline solid; [Sigma-Aldrich MSDS] |
| Also Known As | (2R)-2-amino-3-sulfanylpropanoic acid; cysteine; 52-90-4; Cystein; Thioserine; Half-cystine; (R)-2-Amino-3-mercaptopropanoic acid; L-(+)-Cysteine; beta-Mercaptoalanine; L-Cystein |
| Category | Organic Compounds |
What is L-Cysteine?
L-cysteine is an optically active form of cysteine having L-configuration. It has a role as a flour treatment agent, an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor and a human metabolite. It is a cysteine, a L-alpha-amino acid, a serine family amino acid and a proteinogenic amino acid. It is a conjugate base of a L-cysteinium. It is a conjugate acid of a L-cysteinate(1-). It is an enantiomer of a D-cysteine. It is a tautomer of a L-cysteine zwitterion.
Formula & Notation
IUPAC Name: (2R)-2-amino-3-sulfanylpropanoic acid
Other Names / Synonyms: (2R)-2-amino-3-sulfanylpropanoic acid; cysteine; 52-90-4; Cystein; Thioserine; Half-cystine; (R)-2-Amino-3-mercaptopropanoic acid; L-(+)-Cysteine; beta-Mercaptoalanine; L-Cystein
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 240 dec °C |
| Molecular Weight | 121.16 |
| Solubility | 277000 mg/L (at 25 °C) |
| Appearance | Colorless or white solid; [HSDB] Colorless crystalline solid; [Sigma-Aldrich MSDS] |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
L-cysteine is an optically active form of cysteine having L-configuration. It has a role as a flour treatment agent, an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor and a human metabolite. It is a cysteine, a L-alpha-amino acid, a serine family amino acid and a proteinogenic amino acid. It is a conjugate base of a L-cysteinium. It is a conjugate acid of a L-cysteinate(1-). It is an enantiomer of a D-cysteine. It is a tautomer of a L-cysteine zwitterion.
Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.
Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.
The formula or notation for L-Cysteine is: C3H7NO2S