L-Cysteine Hydrochloride Monohydrate CAS 7048-04-6
| CAS No. | 7048-04-6 |
| Molecular Formula | C3H7NO2S |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
L-Cysteine Hydrochloride Monohydrate (C3H7NO2SHClH2O) contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
L-Cysteine Hydrochloride Monohydrate (CAS 7048-04-6), molecular formula C3H7NO2SHClH2O and molecular weight 175.63 g/mol, is a CATO reference standard with documented purity and traceability.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C3H7NO2S HCl H2O |
| Molecular Weight | 175.63 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | -1.0 |
| CAS Registry Year (est.) | 1959 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related L Standards
- DL-Cysteine- (CAS 10318-18-0)
- DL-Cysteine hydrochloride monohydrate (CAS 116797-51-4)
- DL-Cysteine-3,3-d2 (CAS 124051-54-3)
- L-Cysteine-Glutathione Disulfide (CAS 13081-14-6)
- L-Cysteine Sulfinic Acid 2 (CAS 1315057-92-1)
- D-Cysteine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-S-methyl- (CAS 1393524-09-8)
- DL-Cysteine-3- (CAS 150146-94-4)
- L-Cysteine S-sulfate sodium salt sesquihydrate (CAS 150465-29-5)
Recommended Standards
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- 3-(4-Bromo-3-methylphenyl)-2-thioxo-2,3-dihydroquinazolin-4(1H)-one (CAS 883042-74-8)
- Boronic acid, b-[3-[[[(3-fluorophenyl)methyl]amino]carbonyl]phenyl]- (CAS 874288-20-7)
- Insulin Degludec Impurity 25 (CAS CATO-C4X-215725)
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