Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Product Profile
- Full Name: L-Cystine
- Aliases: (R,R)-3,3'-Dithiobis(2-aminopropanoic acid)
- CAS Number: 56-89-3
- EINECS: 200-296-3
- Molecular Formula: C6H12N2O4S2
- Molecular Weight: 240.30
- Chemical Classification: Natural sulfur-containing chiral amino acid, food nutrition fortifier, pharmaceutical raw material, cosmetic functional additive
- Core Advantages
Natural disulfide-bonded di-amino acid, stable L single chiral configuration, high purity complying with USP/FCC/EP standards. Rich in sulfur element, promotes keratin synthesis, widely used in food nutrition, hair care cosmetics, pharmaceutical amino acid preparations and feed additive industries.
2. Physical & Chemical Properties
2.1 Physical Index
- Appearance: White hexagonal crystalline powder, no caking
- Odor: Odorless, tasteless
- Solubility: Insoluble in cold water, slightly soluble in hot dilute acid; insoluble in ethanol, acetone, ether and organic solvents; soluble in dilute alkali solution
- Specific Optical Rotation [α]D20: -215 ~ -225° (c=1, 1mol/L HCl)
- Melting Point: Decompose at 258–261°C
- Hygroscopy: Non-hygroscopic, stable under normal air storage
- pH (suspension in pure water): Weak acidity
2.2 Chemical Properties
- Disulfide Bond Structure: Contains S2 disulfide linkage, can be reduced to L-cysteine under reducing agent conditions
- Amphoteric Amino Acid: Possess free -NH2 and -COOH groups, forms internal salt in aqueous system, reacts with acid/alkali to generate corresponding salts
- Chiral Stability: Pure L configuration, no racemization under sealed dark normal temperature storage; high temperature and strong alkali will destroy chiral structure
- Thermal Stability: Stable below 200°C; decomposition occurs above 250°C with release of sulfur-containing gas
- Compatibility: Compatible with most neutral food raw materials and cosmetic excipients; incompatible with strong oxidants, which break disulfide bonds
3. Main Application Fields
3.1 Food & Nutritional Health Products (Core Usage)
Nutritional fortifier for functional food, sports nutrition supplements, infant formula milk powder. Supplement sulfur amino acids, improve human keratin metabolism, strengthen hair, nail and skin tissue health.
3.2 Cosmetic & Hair Care Industry
Core functional raw material for hair shampoo, hair perm repair essence, anti-hair loss lotion. Supplement hair cystine content, repair damaged hair cuticle, reduce hair breakage and dryness; also used in anti-aging skincare products to strengthen skin barrier.
3.3 Pharmaceutical Industry
Raw material for compound amino acid infusion, liver-protecting oral preparations, skin ulcer repair medicines. Participate in human glutathione synthesis, assist antioxidant and detoxification; clinical raw material for cystinuria adjuvant treatment.
3.4 Feed & Aquaculture Additive
Nutritional supplement for livestock, poultry and aquatic feed; promote animal fur growth, improve fur luster and animal immunity.
3.5 Biochemical Laboratory Reagent
Standard chiral amino acid reference substance for amino acid chromatographic analysis, cell culture medium additive for biological research labs.
4. Quality Specification Table
| Test Item | Standard Index |
| CAS No. | 56-89-3 |
| Molecular Formula | C6H12N2O4S2 |
| Molecular Weight | 240.30 |
| Appearance | White crystalline powder |
| Melting Range | Decompose at 258–261°C |
| HPLC Chemical Purity | ≥99.0% |
| Specific Rotation | -215° ~ -225° |
| Moisture Content (KF) | ≤0.30% |
| Heavy Metals (Pb) | ≤10 ppm |
| Residue on Ignition | ≤0.10% |
| Bulk Package | 25kg PE lined kraft paper bag / aluminum foil lined fiber drum |
| Sample Package | 1kg / 5kg sealed plastic bag |
| Storage Requirements | Sealed cool dry warehouse ≤25℃; isolate strong oxidants, strong alkali and direct sunlight |
| Transportation Rule | General food/pharma additive, non-hazardous goods, waterproof packaging required |
| Shelf Life | 24 months under intact original sealed packaging |
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