Description

L-Cysteine ( CAS: 52-90-4, Synonyms: ((R)-2-Amino-3-mercaptopropanoicacid;3-mercapto-l-alanin;alpha-amino-beta-mercaptopropionicacid;alpha-AminoChemicalbook-beta-thiolpropionicacid;alpha-amino-beta-thiolpropionicacid;Cystein;half-cysteine;L-Cysteine-animalorigin) is a naturally occurring amino acid in the human body, playing a key role in protein structure. It is a sulfur-containing amino acid closely related to cystine, as the two can reversibly convert into each other. It helps form collagen, supports skin elasticity, and supplies sulfhydryl groups to essential enzymes.Primarily used in cosmetics, pharmaceuticals, and food industries, it is found in perms, sunscreens, cough medicines, and as a bread improver, antioxidant stabilizer, and pet food supplement.

◆Chemical Properties

Melting Point	240 °C (dec.) (lit.)
Specific Rotation	8.75 ° (c=12, 2N HCl)
Boiling Point	293.9 ± 35.0 °C (Predicted)
Bulk Density	300 kg/m³
Density	1.197 (estimate)
FEMA	3263 L-CYSTEINE
Refractive Index	8.8 ° (C=8, 1 mol/L HCl)
Storage Conditions	Store below +30°C.
Solubility	25 mg/mL in water
Acid Dissociation Constant (pKa)	1.92 (at 25°C)
Form	Solid
Color	White

◆Applications

Sr. No.	Description	Application
1	Detoxifier	Acrylonitrile/aromatic acid poisoning, alcohol detoxification via acetaldehyde conversion
2	Anti-radiation Agent	Prevents radiation injury
3	Respiratory Medicine	Treats bronchitis, acts as an expectorant
4	NMDA Receptor Agonist	Neurological applications
5	Hepatic Detoxifier	Hepatitis, liver poisoning, radioactive drug/thallium poisoning
6	Dermatological Treatment	Eczema, urticaria, freckles
7	Biochemical Research	Used in scientific studies

◆Product Specifications

L-Cysteine ( CAS NO.52-90-4) should be handled according to standard chemical industry and pharmaceutical intermediate safety procedures. Appropriate industrial hygiene and protective measures must be followed during handling, storage and operation.

Use appropriate personal protective equipment (PPE)
Avoid inhalation of vapor or mist and contact with skin, eyes and clothing
Handle in controlled, well-ventilated environments
Keep away from heat, sparks, open flames and hot surfaces
Protect from moisture and avoid contact with water
Follow chemical handling, storage and containment protocols
Refer to Safety Data Sheet (SDS) for detailed safety, handling and storage information

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