Products Description
Products Description
L-cysteine free base is a sulfur-containing non-essential proteinogenic α-amino acid with a thiol (-SH) functional group on the side chain. Biosynthetically, it is formed by the trans-sulfuration pathway, where the sulfur atom from L-methionine transfers to the hydroxyl oxygen of L-serine via cystathionine intermediate synthesis. The free thiol group enables reversible redox reactions, acting as a hydrogen donor to neutralize intracellular free radicals and reactive oxygen species. It serves as a rate-limiting precursor for endogenous glutathione biosynthesis, participating in hepatic phase II detoxification and maintaining cellular antioxidant balance. In application scenarios, its molecular structure allows it to break disulfide bonds and regulate protein cross-linking, exhibiting functional adjustability in food texture modification, cosmetic hair structure repair, and pharmaceutical biochemical synthesis. The product is hygroscopic and air-sensitive, soluble in water and dilute mineral acids, insoluble in ethanol and organic solvents, with stable chemical properties under sealed dry and low-temperature storage conditions.
Technical Specification
| Inspection Item | Standard Specification |
|---|---|
| Assay Content | 98.0～101.0% |
| pH (1% Aqueous Solution) | 4.5～5.5 |
| Specific Rotation [α]D20 | +8.3° ～ +9.5° |
| Light Transmittance | ≥95.0% |
| Chloride (Cl) | ≤0.04% |
| Ammonium Salt (NH4+) | ≤0.02% |
| Sulfate (SO4²⁻) | ≤0.03% |
| Iron (Fe) | ≤10ppm |
| Heavy Metals (Pb) | ≤10ppm |
| Arsenic (As) | ≤1ppm |
| Other Amino Acids | Complies with standard limit |
| Loss on Drying | ≤0.50% |
| Residue on Ignition | ≤0.10% |
| Total Aerobic Bacteria | ≤1000 CFU/g |
| Mold & Yeast | ≤100 CFU/g |
Applications
Food Industry
Used as a dough conditioner in baking to improve texture and extend shelf life.Acts as a flavor enhancer in meat products and savory snacks.
Pharmaceuticals
Used as a precursor for glutathione synthesis, it supports treatments targeting liver diseases, bronchitis, and even paracetamol poisoning.
Nutritional Supplements
Its antioxidant and detoxifying properties make it a great dietary supplement for overall health and liver health.
Agriculture and Animal Feed
Add to animal feed to enhance nutrient absorption and improve overall health of livestock and pets.
Cosmetics and Personal Care
Added to hair care products to strengthen hair and promote growth.
Used in skincare formulations for its anti-aging and skin-brightening effects.
Safety Profile
- GHS Classification: Acute oral toxicity Category 4;No classification for skin irritation, eye irritation and environmental hazards
- Hazard Statement: H302: Harmful if swallowed
- Precautionary Statement: P264-Wash thoroughly after handling; P270-Do not eat, drink or smoke when using this product; P301+P312-IF SWALLOWED: Call a POISON CENTER if you feel unwell; P330-Rinse mouth; P501-Dispose of contents/container in accordance with local regulations
- Toxicity Data: Oral LD50 (Rat): 1890 mg/kg;Oral LD50 (Mouse): 660 mg/kg
- Irritation: Mild skin and eye irritation upon direct contact; avoid long-term skin exposure and dust inhalation
- Stability & Reactivity: Stable under normal temperature and sealed conditions;Incompatible with strong oxidants and strong alkalis;Easy to absorb moisture and oxidize when exposed to air
- Storage Safety: Store in dry, cool, ventilated warehouse, sealed and away from light, storage temperature 15-30℃
- Certification Support: Available with MSDS/SDS, COA, Halal, Kosher, Food Grade Certificate; Conforms to FCC, USP, EP standard testing reports; All heavy metal and microbial indicators meet international food/cosmetic/pharma grade safety thresholds
Why Choose Us
- High Purity Standard Compliance: Strictly implement FCC/USP/EP international standards, purity stably controlled at 98.0-101.0%, heavy metals and microorganisms far below industry limit
- Complete Qualification Documents: Provide one-stop certification including MSDS, COA, Halal, Kosher, Food Grade Test Report, support third-party official inspection
- Biotechnology Synthesis: Adopt advanced microbial fermentation synthesis technology, natural source traceability, no harmful residual solvent, better safety and compatibility
- Stable Supply & Fast Delivery: 2000 tons annual production capacity, spot inventory all year round; 7 days lead time for bulk order, support air/sea/express multi-channel delivery
- Customized Service Support: Provide 1kg/bag, 25kg/drum standard packaging and customized packaging; support customized index adjustment and technical formula guidance
- Professional After-sales Team: Provide product application technical support, safety data consultation and after-sales problem solving 24/7
delivery and shipping service
Storage: Store in a dry, cool, and well-ventilated place.
Packaging: 1 kg/bag, 25 kg/drum
Delivery Time: 7 days after order placement
1.Express Delivery
3-5 days for shipments under 100 kg
Door-to-door service
2.Ocean Freight
Over 300 kg: Approximately 30 days. Port-to-port service requires a professional customs clearance agent.
3.Air Freight
100kg-1000kg, 5-7 days
Airport-to-airport service, requires a professional customs clearance agent
Frequently Asked Questions
What is the appearance and solubility of this product?
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It is white crystalline powder, soluble in water and dilute acid, slightly smelly, insoluble in ethanol and organic solvents.
What is the purity standard of your L-cysteine Free Base?
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Our product purity is 98.0% to 101.0%, complying with FCC, USP, EP international standards.
Is L-cysteine Free Base safe for food and cosmetic use?
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Yes. It has passed Halal, Kosher, food grade and cosmetic raw material safety certification, with clear safe dosage limits for different applications.
What are the main functions of L-cysteine Free Base?
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It acts as antioxidant, glutathione precursor, dough conditioner, hair repair agent and hepatic detoxification raw material.
What is the storage requirement of the product?
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Sealed and stored in dry, cool and ventilated place, away from light and strong oxidants, storage temperature 15-30℃.
Send inquiry or contact us to get free sample, and learn more details about it.
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