Molekula
L-Cystine
L-Cystine is a disulfide-bonded dimer of the amino acid L-cysteine, used in biochemical research, cell culture media, and pharmaceutical formulations for its role in protein structure and antioxidant activity. It has a CAS number of 56-89-3, molecular formula [-SCH2CH(NH2)CO2H]2, and a molecular weight of 240.30 g/mol. Stable at ambient storage conditions. Molekula supplies L-Cystine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Overview
L-Cystine is a disulfide-bonded dimer of the amino acid L-cysteine, used in biochemical research, cell culture media, and pharmaceutical formulations for its role in protein structure and antioxidant activity. It has a CAS number of 56-89-3, molecular formula [-SCH2CH(NH2)CO2H]2, and a molecular weight of 240.30 g/mol. Stable at ambient storage conditions. Molekula supplies L-Cystine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Pricing & pack sizes
Specifications
| Property | Value |
|---|---|
| Appearance | White crystals or crystalline powder |
| Specific rotation | -215° to -225° |
| Conclusion | Conforms to USP Specification |
| Heavy metals | ≤ 0.0015% |
| Loss on Drying | ≤ 0.20% |
| Chloride (Cl) | ≤ 0.10% |
| Assay | 98.5% to 101.5% |
| Particle Size | Approx 80 mesh/ 165 micron. |
| Residual on Ignition | ≤ 0.10% |
| Iron (Fe) | ≤ 0.003% |
| Sulphate (SO4) | ≤ 0.040% |
| Arsenic (As) | ≤ 1.5ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Shelf Life | 24 months |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| CAS Number | 56-89-3 |
| Molecular Formula | [-SCH2CH(NH2)CO2H]2 |
| Molecular Weight | 240.30 |
| SMILES | O=C(O)C(N)CSSCC(N)C(=O)O |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29309092 |
| Tariff Code | 2930901300 |
Safety & GHS
For research and industrial use only
Documents
Safety Data Sheets (SDS)
Available in RU, IT, FR, ES, DE, EN.
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RU - (11394887) L-CYSTINE [56-89-3].pdf
SDS · RU · 256 KB
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IT - (11394887) L-CYSTINE [56-89-3].pdf
SDS · IT · 250 KB
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FR - (11394887) L-CYSTINE [56-89-3].pdf
SDS · FR · 252 KB
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ES - (11394887) L-CYSTINE [56-89-3].pdf
SDS · ES · 251 KB
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DE - (11394887) L-CYSTINE [56-89-3].pdf
SDS · DE · 252 KB
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EN - (11394887) L-CYSTINE [56-89-3].pdf
SDS · EN · 249 KB
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.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is L-Cystine used for?
L-Cystine is primarily used in pharmaceuticals, cosmetics, and dietary supplements for its role in protein synthesis and antioxidant properties.
What is the chemical formula and molecular weight of L-Cystine?
The formula is [-SCH2CH(NH2)CO2H]2 and the molecular weight is 240.30 g/mol.
How should L-Cystine be stored?
Store at ambient temperature, protected from moisture and light.
What grade of L-Cystine does Molekula supply?
Molekula supplies L-Cystine in pharmaceutical grade.
Can Molekula supply L-Cystine in bulk?
Yes, Molekula can supply L-Cystine in bulk quantities upon request.
What documentation comes with an order of L-Cystine?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS).
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.