Description

L-Cysteine Hydrochloride Hydrate, 98.5-101.5% is the hydrochloride salt of the essential amino acid L-Cysteine, provided as a monohydrate. This high-purity grade is critical for applications demanding precise biochemical activity and consistent quality, serving as a versatile building block and reducing agent. It is essential for manufacturers in the pharmaceutical, nutraceutical, and food industries seeking a reliable source for synthesis, formulation, and nutritional enhancement.

Application

• Pharmaceutical Synthesis: Used as a key chiral intermediate and precursor in the production of active pharmaceutical ingredients (APIs), including antibiotics like cephalosporins and treatments for acetaminophen overdose.
• Nutraceutical & Dietary Supplements: Incorporated as a nutritional supplement and antioxidant in capsules, tablets, and powders to support glutathione production and cellular health.
• Food & Flavor Industry: Functions as a dough conditioner in baking, a flavor enhancer in savory products, and an antioxidant to prevent spoilage in beverages and processed foods.
• Cosmetic & Personal Care: Employed in hair waving/straightening formulations and skin care products for its reducing and antioxidant properties.
• Cell Culture & Biotechnology: Serves as a component of cell culture media and a stabilizing agent for proteins and peptides in bioprocessing.
• Chemical Synthesis: Acts as a reagent in organic synthesis and as a precursor for other cysteine derivatives and fine chemicals.

Basic Information

Product Name	L-Cysteine Hydrochloride Hydrate, 98.5-101.5%
CAS No.	345909-32-2
Molecular Formula	C3H7NO2S · HCl · H2O
Molecular Weight	175.63 g/mol
Synonyms	L-Cysteine HCl monohydrate; (R)-2-Amino-3-mercaptopropanoic acid hydrochloride monohydrate; Cysteine hydrochloride hydrate; Cysteinum hydrochloridum monohydricum; Cys-HCl·H2O; H-Cys-OH·HCl·H2O; L-2-Amino-3-mercaptopropionic acid hydrochloride monohydrate
EINECS	Contact for details

Quality Control

Our L-Cysteine Hydrochloride Hydrate is produced under strict quality management systems. Each batch is tested to ensure it meets the specified purity of 98.5-101.5% and complies with relevant standards for its intended use, including potential alignment with USP-NF, FCC, or Ph. Eur. monographs. A comprehensive Certificate of Analysis (COA) documenting identity, purity, and impurity profiles is available for every shipment upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); the original container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White or almost white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.5 - 101.5 %
Specific Rotation	+5.5° to +7.0°
pH (5% solution)	1.5 - 2.5
Loss on Drying	7.0 - 9.5 %
Residue on Ignition	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.