| Product Name: | L-(+)-Cysteine | Other Name: | L-Cysteine;Cysteine,L-;Half-cystine;β-Mercaptoalanine;Thioserine;L-(+)-Cysteine;Cysteine;Propanoic acid,2-amino-3-mercapto-,(R)-;Cystein;L-Alanine,3-mercapto-;NSC 8746;(R)-2-Amino-3-mercaptopropanoic acid;(R)-Cysteine;2-Amino-3-mercaptopropionic acid;L-Cys;E 920;(R)-2-Amino-3-mercaptopropanoic acid;(R)-2-Amino-3-sulfanylpropanoic acid;(2R)-2-Amino-3-sulfanylpropanoic acid;2-Amino-3-mercaptopropanoic acid;11: PN: WO2021055880 SEQID: 12 claimed protein;4371-52-2;154605-72-8;1404190-35-7 |
| CAS No.: | 52-90-4 | Molecular Formula: | C3H7NO2S |
| InChIKeys: | InChIKey=XUJNEKJLAYXESH-REOHCLBHSA-N | Molecular Weight: | 121.15800 |
| Exact Mass: | 121.16 | EC Number: | 200-158-2 |
| UNII: | K848JZ4886 | DSSTox ID: | DTXSID8022876 |
| NCI Thesaurus Code: | C29609 | Color/Form: | Colorless crystals|White crystals |
| HScode: | 2930901000 | Categories: | Amino Acids and Derivatives |
| PSA: | 102.12000 | XLogP3: | -2.5 |
| Appearance: | DryPowder | Density: | 3 @ Temp: 45.00 °C”>1.6666 g/cm3 @ Temp: 45.00 °C |
| Melting Point: | 240 °C (decomp) | Boiling Point: | 293.9ºC at 760 mmHg |
| Flash Point: | 131.5ºC | Refractive Index: | 8.8 ° (C=8, 1mol/L HCl) |
| Water Solubility: | H2O: 280 g/L (25 ºC) | Storage Conditions: | Store at RT. |
| Vapor Pressure: | 6.73X10-7 mm Hg at 25 deg C (est) | Toxicity: | LD50 orally in Rabbit: 1890 mg/kg |
| Specific rotation: | Specific optical rotation: +6.5 deg at 25 °C/D (5 N HCl); +13.0 deg at 25 °C/D (glacial acetic acid) | PKA: | 1.71None |
| Henrys Law Constant: | Henry’s Law constant = 5.30X10-11 atm-cu m/mol at 25 °C (est) | Dissociation Constants: | 1.71|pK1 1.71 /carboxylic/; pK2 8.33 /amine/; pK3 10.78 /sulfide/ |
| Collision Cross Section: | 149.57 Ų [M+H]+ [CCS Type: DT, Method: stepped-field]|151.34 Ų [M+Na]+ [CCS Type: DT, Method: stepped-field]|144.47 Ų [M-H]- [CCS Type: DT, Method: stepped-field]|113 Ų [M+H]+ [CCS Type: TW, Method: calibrated with polyalanine]|144 Ų [M-H]- | Experimental Properties: | 100 (20 °C) g/100 g H2O /L-Cysteine hydrochloride monohydrate/|Hydroxyl radical reaction rate constant = 7.96X10-11cu cm/molecule-sec at 25 °C (est)”>Readily oxidizes to form a dimeric amino acid, cystine, in which the two cysteines are linked via a disulfide bridge, a common structural feature in proteins. Amino Acids and Proteins, D.M. Greenberg, Ed. (Charles C. Thomas, Springfield, IL, 1951) 950 pp.|In neutral or slightly alkaline aqueous solution it is oxidized to cystine by air. More stable in acidic solutions.|MP (anhydrous): 178 °C (decomposes). Specific optical rotation: +6.53 deg at 25 °C/D (calculated as cysteine) (c = 2 in 5M HCl); solubility >100 (20 °C) g/100 g H2O /L-Cysteine hydrochloride monohydrate/|Hydroxyl radical reaction rate constant = 7.96X10-11cu cm/molecule-sec at 25 °C (est) |
Classification of the substance or mixture
Acute toxicity – Category 4, Oral
GHS label elements, including precautionary statements
| Pictogram(s) |  |
|---|---|
| Signal word |
Warning |
| Hazard statement(s) |
H302 Harmful if swallowed |
| Precautionary statement(s) | |
| Prevention |
P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. |
| Response |
P301+P317 IF SWALLOWED: Get medical help. P330 Rinse mouth. |
| Storage |
none |
| Disposal |
P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal. |
Other hazards which do not result in classification
no data available
Precautions for safe handling
Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.
Conditions for safe storage, including any incompatibilities
Keep container tightly closed in a dry and well-ventilated place. Store under inert gas. Air sensitive. Storage class (TRGS 510): Non Combustible Solids.