L-Cysteine Hydrochloride Monohydrate (CAS 7048-04-6) is white crystalline powder, a hydrated sulfur-containing amino acid hydrochloride. It has strong reducing and antioxidant properties, freely soluble in water. Easily oxidized under neutral or alkaline conditions upon air exposure. Widely used in food, pharmaceutical, cosmetic and biochemical fields. TNJ Chemical is the key manufacturer and exporter since from 2001 in China. If you want to buy L-Cysteine HCL anhydrous or monohydrate food or Pharma USP grade at competitive price, please contact sales@tnjchem.com
Product information
Chemical Name L-Cysteine Hydrochloride Monohydrate
Common Name L-Cysteine HCl Monohydrate
CAS Number 7048-04-6Molecular Formula C₃H₇NO₂S·HCl·H₂O
Molecular Weight 175.63 g/mol
EC Number 200-157-7
Grade Available Food grade, USP / Ph.Eur pharmaceutical grade, Biochemical grade
Hazard Statement May cause irritation to skin and eyes
Chem-physical properties
Appearance White crystalline powder
Odor Slight sulfur‑containing characteristic odor
Melting Point 175 °C (decomposition)Solubility Freely soluble in water; slightly soluble in ethanol; insoluble in ether, acetone, benzene
pH (1 % aqueous solution) 1.5‑2.0
Optical Rotation [α]20/D +5.5 ° ~ +7.5 °
Loss on drying (water of crystallization) 8.5‑12.0 %
Stability Stable under acidic condition; easily oxidized by air in neutral‑alkaline environment; light‑sensitive
Quality specification
| Item | Food Grade | USP / Ph.Eur Grade |
|---|---|---|
| Assay (on dried basis) | ≥98.5 % | 98.5‑101.0 % |
| Optical Rotation [α]20/D | +5.5 ° ~ +7.5 ° | +5.0 ° ~ +8.0 ° |
| Loss on drying | 8.5‑12.0 % | 8.5‑12.0 % |
| Residue on ignition | ≤0.1 % | ≤0.1 % |
| Heavy metals (Pb) | ≤10 ppm | ≤10 ppm |
| Iron (Fe) | ≤10 ppm | ≤10 ppm |
Application & use
Food industry: Dough conditioner for bakery, antioxidant, anti‑browning agent, nutritional supplement.
Pharmaceutical field: Amino acid raw material, expectorant, detoxification agent, excipient for drug formulations.
Cosmetic & personal care: Reducing agent for hair perm products, antioxidant additive for skincare.
Biochemical research: Reducing reagent, culture medium additive for microorganism and cell culture.
Packing
25 kg fiber drum with inner double PE bag.
Lab small pack: 1 kg, 5 kg sealed aluminum foil bag.
Keep package tightly sealed against air and light.
Transportation & storage
- Transportation: Non‑dangerous goods. Avoid direct sunlight, rain and moisture. Keep away from oxidizing agents. Prevent package breakage.- Storage: Store in cool, dry and well-ventilated warehouse. Keep container tightly closed and protected from light.
- Shelf-life: 24 months under proper storage conditions.
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