Description

Dl-Cysteine Hydrochloride Monohydrate is a synthetic, racemic form of the amino acid cysteine, stabilized as a hydrochloride salt monohydrate. This compound is valued for its role as a versatile reducing agent, antioxidant, and precursor in biochemical synthesis, offering a stable and readily available source of cysteine functionality. It is essential for manufacturers in the pharmaceutical, nutraceutical, and food industries, where it serves as a key intermediate and processing aid.

Application

• Pharmaceutical Synthesis: Used as a chiral building block and intermediate in the production of active pharmaceutical ingredients (APIs) and peptide drugs.
• Nutraceutical & Dietary Supplements: Incorporated as a source of L-cysteine or as a stabilizer in supplement formulations.
• Food Processing: Acts as a dough conditioner, flavor enhancer, and antioxidant in baked goods and other food products.
• Biochemical Research: Employed as a reducing agent to break disulfide bonds in proteins and enzymes in laboratory settings.
• Cosmetic & Personal Care: Functions as an antioxidant and hair-waving/straightening agent in cosmetic formulations.
• Animal Feed Additive: Used as a nutritional supplement to support animal health and growth.

Basic Information

Product Name	Dl-Cysteine Hydrochloride Monohydrate
CAS No.	96998-61-7
Molecular Formula	C3H7NO2S • HCl • H2O
Molecular Weight	175.63 g/mol
Synonyms	DL-Cysteine HCl monohydrate; (±)-2-Amino-3-mercaptopropanoic acid hydrochloride monohydrate; Racemic Cysteine Hydrochloride Monohydrate; Cysteine Hydrochloride Monohydrate (racemic); 3-Mercapto-DL-alanine hydrochloride monohydrate; H-Cys-OH • HCl • H2O (racemic); DL-2-Amino-3-sulfhydrylpropionic acid hydrochloride monohydrate
EINECS	Contact for details

Quality Control

Our Dl-Cysteine Hydrochloride Monohydrate is produced under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for pharmaceutical and food-grade applications. Certificates of Analysis (COA) documenting purity, identity, and impurity profiles are provided to guarantee supply reliability and batch-to-batch consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept under conditions that minimize exposure to atmospheric humidity to prevent caking and degradation.

Specification

Item	Specification
Appearance	White to almost white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.0% - 102.0% (on anhydrous basis)
Specific Rotation	-0.10° to +0.10° (c=5 in H2O)
Water Content (KF)	8.0% - 10.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
Related Substances (HPLC)	Total impurities ≤ 1.0%

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