L - Cysteine Hydrochloride

• English Name: L - Cysteine Hydrochloride
• Chemical Name: L - 2 - Amino - 3 - mercaptopropionic acid hydrochloride
• CAS Number: 7048 - 04 - 6 (anhydrous); 52 - 89 - 1 (monohydrate)
• Molecular Formula:  C3​H7​NO2​S⋅HCl  (anhydrous);  C3​H7​NO2​S⋅HCl⋅H2​O  (monohydrate)
• Molecular Weight: 157.62 (anhydrous); 175.64 (monohydrate)

• Appearance: White or almost white crystalline powder.
• Melting Point: 175 - 178 °C (with decomposition) for anhydrous; decomposes at a certain temperature for monohydrate.
• Solubility: Freely soluble in water, slightly soluble in e/thanol, insoluble in e/ther.
• Specific Optical Rotation:  [α]D20​  = +5.0° to +7.0° (c = 1, in 1 N HCl) for anhydrous and monohydrate (usually similar range).

• Purity (Dry basis): Usually ≥ 98.0%.
• Loss on Drying: For anhydrous: Max. 0.5%; For monohydrate: Usually within a certain range related to the water content, e.g., 8.0% - 12.0%.
• Residue on Ignition: Max. 0.1%.
• Heavy Metals: Max. 10 ppm.
• Arsenic: Max. 2 ppm.
• Related Substances: Individual impurity max. 0.5%, total impurities max. 2.0%.

• Food Industry: Used as a food additive, mainly as an antioxidant and dough improver. It can prevent the oxidation of food ingredients, improve the processing performance of dough, and extend the shelf life of food.
• Pharmaceutical Industry: An important raw material for the synthesis of many drugs. It is used in the treatment of liver diseases, detoxification, and as an antioxidant in some pharmaceutical formulations. Also used in the preparation of amino acid infusions.
• Cosmetics Industry: Applied in cosmetics and skin - care products. It helps to reduce wrinkles, improve skin elasticity, and has a certain effect on whitening and anti - aging.

• Storage: Store in a cool, dry, well - ventilated place, protected from light. Keep the container tightly closed to prevent oxidation and moisture absorption. It is recommended to store under nitrogen or in an air - tight package.
• Handling: Wear appropriate protective equipment, such as gloves and goggles. Avoid contact with strong oxidants and alkaline substances. In case of contact with skin or eyes, rinse immediately with plenty of water.

• Hazard Statements: May cause skin and eye irritation. Inhalation of dust may cause respiratory irritation. Ingestion of large amounts may be harmful to the body.
• Precautionary Statements: Avoid inhalation of dust. Keep away from heat, sparks, and open flames. Store in a well - ventilated area. In case of accidental ingestion, seek medical attention immediately. Keep out of reach of children.

Company Introduction: East Chemsources Limited was established in 2008, is a professional company engaged in the development of chemical products. In the past of 15 years，through continuous technological innovation and the use of talent introduction advantages, we have achieved rapid development, and has become an international diversified modern chemical enterprise. At present, our products have been exported to more than 80 countries,including food additives, medical raw materials, chemical products and personal care.

Since the establishment of the company, always adhere to the credibility first, quality first enterprise creed. Our company is committed to creating a customer-centric, customer-demand-oriented, customer value creation and achievement of customer dreams for the purpose of the service concept, with a broad vision and broad mind, committed to creating good benefits and market operation, to build corporate brand.