L-Cysteine hydrate CAS 39665-15-1
| CAS No. | 39665-15-1 |
| Molecular Formula | C3H7NO2S |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
L-Cysteine hydrate (CAS 39665-15-1), molecular formula C3H7NO2SH2O and molecular weight 139.17 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of L-Cysteine hydrate (C3H7NO2SH2O) is characterized by an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
As a certified reference material (CRM), L-Cysteine hydrate meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C3H7NO2S H2O |
| Molecular Weight | 139.17 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 0.0 |
| CAS Registry Year (est.) | 1968 |
| 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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- m-PEG9-CH2COOH (CAS 405518-55-0)
- n-(2-Aminoethyl)-n-methylcyclohexanamine (CAS 14256-69-0)
- 2-((2-Chlorophenyl)thio)benzo[d]thiazole (CAS 60372-34-1)
- Tau Peptide (379-408) trifluoroacetate salt (CAS 1246357-53-8)
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