Molekula L-Cysteine
Specification & product details.
L-Cysteine is a sulfur-containing amino acid used in biochemical research, pharmaceuticals, and food supplements for its role in protein synthesis and…
CAS number: 52-90-4
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Specifications
| Property | Value |
| Appearance | White crystalline powder |
| Specific rotation | +8.3° to +9.5° |
| pH | 4.5 - 5.5 |
| Loss on Drying | ≤ 0.5% |
| Chloride (Cl-) | ≤0.2% |
| Assay | 98.0 - 101.0% |
| Residue on Ignition | ≤ 0.1% |
| Heavy Metals (Pb) | ≤ 10ppm |
| Iron (Fe) | ≤ 10ppm |
| Arsenic trioxide (As2O3) | ≤ 1ppm |
| Ammonium (NH4+) | ≤ 0.02% |
| Sulphates (SO4)(2-) | ≤ 0.03% |
| State of Solution | ≥ 95.0% |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
| Storage Temperature | 2 to 8 °C |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
| Appearance | Colorless crystals |
| Melting Point | 260 °C decomposes |
| Water Solubility | Freely soluble in water |
| Solubility (other solvents) | Very soluble in water and acetic acid; Insoluble in ether, acetone and benzene |
| Vapour Pressure | 0.00000207 mmHg |
| pKa | pKa = 1.71 |
| log P (octanol/water) | -2.49 |
Identification
| Property | Value |
| SKU | 15386031 |
| CAS Number | 52-90-4 |
| IUPAC Name | (2R)-2-amino-3-sulfanylpropanoic acid |
| EC Number | 200-158-2 |
| Molecular Formula | HSCH2CH(NH2)CO2H |
| Molecular Weight | 121.16 |
| Exact Mass | 121.0197 |
| SMILES | C(\[C@@H\](C(=O)O)N)S |
| InChIKey | XUJNEKJLAYXESH-REOHCLBHSA-N |
| InChI | InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1 |
| PubChem CID | 5862 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29309092 |
| Tariff Code | 2930901300 |
Safety & GHS
Warning
- Health HazardGHS07
Hazard statements
- H302Harmful if swallowed
Precautionary statements
- P264Wash thoroughly after handling
- P280Wear protective gloves/protective clothing/eye protection/face protection
- P301+312IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
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Alternative names
(2R)-2-amino-3-sulfanylpropanoic acid; (R)-2-Amino-3-mercaptopropanoic acid; beta-Mercaptoalanine; Cystein; cysteine; Cysteinum; Half-cystine; L-Cys; L-Cystein; Thioserine
Product documentation
Product specification PDF. Batch-specific certificates of analysis and safety data sheets are available on request.
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