L-Cysteine Hydrochloride Monohydrate L-Cysteine HCl Monohydrate CAS 7048-04-6 CAS 52-89-1

• Customization: Available
• CAS No.: 7048-04-6; 52-89-1
• Formula: C3h7no2s.HCl;C3h7no2s.HCl.H2O
• Model NO.: 99%
• Appearance: White Crystal
• Grade Standard: Industrial Grade
• Transport Package: 25 Kg Per Drum or Bag
• Specification: ≥ 99%
• Trademark: JinYu
• Origin: China

Product Description

Product Description

Basic Information

• Product Name: L-Cysteine Hydrochloride
• CAS Number: 7048-04-6 (Anhydrous); 52-89-1 (Monohydrate)
• Molecular Formula:
  • Anhydrous: C3H7NO2S.HCl
  • Monohydrate: C3H7NO2S.HCl.H2O
• Molecular Weight:
  • Anhydrous: 157.62 g/mol
  • Monohydrate: 175.64 g/mol
• Structure: Hydrochloride salt of the natural amino acid L-cysteine, containing a reactive sulfhydryl group (-SH).

Physical and Chemical Properties

Property	Description
Appearance	White crystalline powder, hygroscopic
Odor	Slight odor of rotten eggs (due to volatile -SH)
Solubility	Highly soluble in water (1g/1.5mL water); insoluble in ethanol and diethyl ether
pH Value	1% aqueous solution: pH 1.7-2.1 (acidic)
Melting Point	~175°C (decomposes)
Stability	Prone to oxidation under light or heat; -SH group easily oxidizes to disulfide bonds (-S-S-) in air

Applications
1. Food Industry

• Antioxidant:
  • Prevents lipid oxidation in baked goods (e.g., bread, cakes) and extends shelf life. Acts as a dough conditioner by breaking disulfide bonds in gluten, improving elasticity (e.g., pizza dough).
• Nutritional Fortifier:
  • Added to beverages and health products to supplement sulfur-containing amino acids (precursor of glutathione for antioxidant and detoxification functions).
• Meat Processing:
  • Enhances color retention and flavor in sausages and hams, preventing browning.

2. Pharmaceuticals and Health Products

• Drug Intermediate:
  • Used in expectorants (e.g., acetylcysteine to dissolve mucus) and liver-protective drugs. Reduces bone marrow suppression in chemotherapy.
• Dietary Supplements:
  • Formulated as tablets or capsules to improve skin health (collagen synthesis), boost immunity, and relieve fatigue.

3. Cosmetics Industry

• Skin Care:
  • Added to creams and serums for antioxidant effects (scavenging free radicals) and regulating keratin metabolism to brighten skin.
• Hair and Depilation Products:
  • Breaks disulfide bonds in hair keratin for permanent waving (e.g., cold wave solutions) or hair removal.

4. Other Fields

• Feed Additives:
  • Supplies sulfur amino acids in pet food and aquaculture feed to promote animal growth.
• Biochemical Research:
  • Used as a sulfhydryl reagent for enzyme activity assays and protein structure analysis ( -SH binds to heavy metals).

Safety and Precautions
Toxicity and Limits

• Acute Toxicity: Oral LD50 in rats > 2000 mg/kg (low toxicity).
• Food Additive Limits:
  • China (GB 14880-2012): Max 0.06 g/kg in bread; diluted proportionally in powdered drinks.
  • FDA (US): GRAS-listed for foods (e.g., baked goods, seasonings), typically 0.01-0.1%.
• Risks:
  • Avoid oxidation by storing in airtight, light-resistant containers; keep away from oxidants and metal ions (e.g., Fe³, Cu²).
  • High oral doses may cause nausea/vomiting; skin contact may irritate sensitive individuals.

Storage Conditions

• Store in a cool, dry place away from heat and light; nitrogen-filled packaging is recommended to prevent oxidation.

Product Parameters

 

Packaging & Shipping

Liquid products	Drum of 5kg ,10 kg ,25 kg ,50 kg 200 kg ,250 kg . 1000 kg IBC drum. TANK with 20 tons ,25 tons .
Solid products	Bag of 1 kg ,2 kg ,5 kg ,25 kg ,500kg ,1000 kg . Drum of 25 kg and 50 kg.

Packaging can be customized according to customer requirements.

Company Profile

Qingdao Jinyu Chemical Co., LTD,which is located in Qingdao City, China, with registered capital of RMB 10 million, is a dynamic chemical import and export enterprise with customer demand as its own responsibility. The founder has been engaged in the chemical industry for more than 20 years. With professional technical and marketing personnel, diversified cooperative factories with synthetic technology and efficient logistics management, we provide services to customers all over the world. After years of hard work, we have selected a number of excellent chemical production cooperative enterprises in China. These enterprises have their own advantages in different chemical synthesis fields. They have passed the strict inspection of suppliers by many customers and formed a long-term and stable strategic partnership with customers. With our partners' excellent equipment, well-trained employees and mature technology, we also continue to provide customers with more products.

Our Advantages