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.
L-Cysteine Hydrochloride Anhydrous
1. Basic Product Information
Product Name: L-Cysteine Hydrochloride Anhydrous
CAS Number: 52-89-1
Molecular Formula: C3H8ClNO2S
Molecular Weight: 157.62
Synonyms: Anhydrous L-Cysteine HCl, (2R)-2-Amino-3-mercaptopropanoic acid hydrochloride
Product Category: Food additive, cosmetic raw material, pharmaceutical amino acid API, biochemical reducing reagent
2. Physical and Chemical Properties
Physical Indicators
- Appearance: White crystalline powder
- Odor: Faint mercaptan sulfur odor
- Solubility: Freely soluble in water, methanol; slightly soluble in ethanol; insoluble in acetone, ether, benzene
- Melting Point: 175–178 °C (decomposes)
- Specific Rotation: [α]D2? = +6.0° ~ +8.0° (c=8, H2O)
- Density (20 °C): 1.38 g/cm3
- Hygroscopicity: Highly hygroscopic, easily absorbs moisture in humid air
- Aqueous Stability: Aqueous solution oxidizes rapidly under air exposure; stable under acidic and nitrogen-sealed environment
Chemical Characteristics
- Molecular Structure: Chiral amino acid hydrochloride with free thiol (-SH) group
- Core Functionality: Strong reducing agent; cleaves protein disulfide bonds, inhibits melanin formation, acts as antioxidant
- Oxidation Sensitivity: Thiol group readily oxidizes to cystine disulfide when exposed to oxygen, especially under neutral/alkaline conditions
- Photostability: Light-sensitive; UV light accelerates oxidation and yellow discoloration
- Thermal Stability: Stable below 140 °C; thermal decomposition above melting point releases irritating sulfur and hydrogen chloride fumes
- Chemical Compatibility: Compatible with weak acidic buffers; incompatible with air, heavy metal ions, strong oxidants and alkaline substances
3. Main Application Fields
- Core Application: Food Industry Additive
- Bread & bakery dough improver: Reduces gluten toughness, improves dough extensibility
- Antioxidant for fruit & beverage, prevents browning of food raw materials
- Cosmetic Whitening Raw Material
Tyrosinase inhibitor, used in skin care formulas to fade pigment spots and brighten skin tone - Pharmaceutical Amino Acid API
Raw material for liver-protective medicines, injection nutrient formulations, antidote for acetaminophen poisoning - Biochemical Laboratory Reagent
Protein denaturation reducing agent for electrophoresis, peptide synthesis and cell culture experiments
4. Platform Category & Product Group Selection Guide
1) Domestic B2B Platform Category
Recommended Path: Organic Intermediates / Food Additives
Reason: Multi-purpose amino acid raw material widely used in food, cosmetics and pharmaceutical industries
2) English Product Group Dropdown Options
Recommended Selection: Basic Organic Chemicals
Do NOT select Pharmaceutical Chemicals exclusively; it is also mainstream food additive raw material
3. Standard Foreign Trade Packaging Specification
1kg nitrogen vacuum aluminum foil bag for lab test samples; 25kg double PE lined fiber drum for food & cosmetic factory bulk orders; moisture-proof light-proof sealed packaging
5. Quality Specification Table
| Test Item | Standard Requirement |
| CAS Number | 52-89-1 |
| Molecular Formula | C3H8ClNO2S |
| Appearance | Uniform white crystalline powder without yellow oxidized impurities |
| Assay | Food Grade ≥99.0%, Pharma Grade ≥99.5% |
| Specific Rotation | +6.0° ~ +8.0° |
| Water Content (KF) | ≤0.50% |
| Cystine Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Arsenic (As) | ≤2 ppm |
| Standard Storage Package | Nitrogen-filled light-proof vacuum aluminum foil bag, 25kg PE lined fiber drum |
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