Description

L-Cysteine Monohydrochloride is a high-purity, crystalline amino acid derivative essential for numerous biochemical and industrial processes. Its primary value lies in its role as a reducing agent, dough conditioner, and a key precursor in pharmaceutical synthesis, offering superior stability and handling compared to the free base form. This product is critically needed by manufacturers in the pharmaceutical, food & beverage, and nutraceutical industries for applications ranging from drug formulation to flavor enhancement.

Application

• Pharmaceutical Synthesis: Used as a key intermediate and reducing agent in the production of various drugs, including antibiotics (e.g., cephalosporins) and treatments for acetaminophen overdose.
• Food & Beverage Industry: Functions as a dough conditioner and strengthening agent in baked goods, and as a flavor enhancer in savory products and meat analogs.
• Nutraceuticals & Dietary Supplements: Incorporated into formulations for its antioxidant properties and its role as a precursor to glutathione, a vital cellular antioxidant.
• Cosmetics & Personal Care: Acts as a reducing agent in permanent wave solutions for hair and is used in skin care products for its antioxidant and purported anti-aging benefits.
• Animal Feed Additive: Employed as a nutritional supplement to support feather and hair growth in poultry and other livestock.
• Biochemical Research: Serves as a critical reagent in cell culture media and various enzymatic studies.

Basic Information

Product Name	L-Cysteine Monohydrochloride
CAS No.	52-89-1
Molecular Formula	C3H7NO2S • HCl
Molecular Weight	157.62 g/mol
Synonyms	L-Cysteine HCl; L-Cysteine Hydrochloride; (R)-2-Amino-3-mercaptopropanoic acid hydrochloride; Cysteine HCl; Cysteine Hydrochloride; Cysteinum hydrochloridum; Cysteine monohydrochloride; 2-Amino-3-sulfhydrylpropionic acid hydrochloride
EINECS	200-157-7

Quality Control

Our L-Cysteine Monohydrochloride is manufactured under strict quality management systems. Each batch is tested to meet stringent specifications, which may align with standards such as USP, FCC, or Ph. Eur. based on the grade supplied. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to ensure full traceability and compliance for your applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can lead to caking and degradation.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.5% - 101.5%
Specific Rotation [α]20/D	+5.5° to +7.0°
pH (5% Solution)	1.5 - 2.5
Loss on Drying	≤ 0.5%
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.