Molekula
L-Cysteine
L-Cysteine is a sulfur-containing amino acid used in biochemical research, pharmaceuticals, and food supplements for its role in protein synthesis and antioxidant activity. It is available as a white to off-white crystalline powder. CAS: 52-90-4, Molecular Formula: HSCH2CH(NH2)CO2H, Molecular Weight: 121.16 g/mol. Store at 2 to 8 °C. Signal word: Warning. Molekula supplies L-Cysteine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Overview
L-Cysteine is a sulfur-containing amino acid used in biochemical research, pharmaceuticals, and food supplements for its role in protein synthesis and antioxidant activity. It is available as a white to off-white crystalline powder. CAS: 52-90-4, Molecular Formula: HSCH2CH(NH2)CO2H, Molecular Weight: 121.16 g/mol. Store at 2 to 8 °C. Signal word: Warning. Molekula supplies L-Cysteine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Specifications
| Property | Value |
|---|---|
| Appearance | White crystalline powder |
| Specific rotation | +8.3° to +9.5° |
| pH | 4.5 - 5.5 |
| Loss on Drying | ≤ 0.5% |
| Sulfate (SO4) | ≤ 0.03% |
| Chloride (Cl) | ≤0.2% |
| Assay | 98.0 - 101.0% |
| Residue on Ignition | ≤ 0.1% |
| Iron (Fe) | ≤ 10ppm |
| Heavy metals (as Pb) | ≤ 10ppm |
| Arsenic (As2O3) | ≤ 1ppm |
| Ammonium (NH4) | ≤ 0.02% |
| State of Solution | ≥ 95.0% |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Shelf Life | 24 months |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| CAS Number | 52-90-4 |
| Molecular Formula | HSCH2CH(NH2)CO2H |
| Molecular Weight | 121.16 |
| SMILES | C([C@@H](C(=O)O)N)S |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29309092 |
| Tariff Code | 2930901300 |
Safety & GHS
-
Explosive
GHS01
Hazard statements
- H302 Harmful if swallowed
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
For research and industrial use only
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Pricing & pack sizes
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is L-Cysteine used for?
L-Cysteine is used in pharmaceuticals, cosmetics, and food additives as a reducing agent and antioxidant, and in the synthesis of other chemicals.
What is the chemical formula and molecular weight of L-Cysteine?
The formula is HSCH2CH(NH2)CO2H and the molecular weight is 121.16 g/mol.
How should L-Cysteine be stored?
Store at 2 to 8 °C in a cool, dry place, protected from light and moisture.
What grade of L-Cysteine does Molekula supply?
Molekula supplies L-Cysteine in pharmaceutical and research-grade purity.
Can Molekula supply L-Cysteine in bulk?
Yes, Molekula can supply L-Cysteine in bulk quantities—please contact sales for details.
What documentation comes with an order of L-Cysteine?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.