Description

Dl-Cysteine Hydrochloride CAS NO 10318-18-0 is the hydrochloride salt of the racemic mixture of the amino acid cysteine. This compound is a versatile biochemical building block and reducing agent, valued for its ability to modify protein structure and act as an antioxidant. It is essential for manufacturers in the pharmaceutical, nutraceutical, and food industries seeking a reliable source of this key intermediate for synthesis and formulation.

Application

• Pharmaceutical Synthesis: Used as a chiral intermediate and a precursor in the production of various drugs, including expectorants and medications for liver support.
• Nutraceutical & Dietary Supplements: Incorporated as an active ingredient or stabilizer in formulations targeting antioxidant support and detoxification.
• Food Industry (as a processing aid): Functions as a dough conditioner in baking and as an antioxidant to prevent flavor and color degradation in certain food products.
• Biochemical Research: Serves as a critical reagent in protein chemistry studies, often used to break disulfide bonds in peptides and proteins.
• Cosmetic & Personal Care: Utilized in hair care formulations for permanent wave solutions and in skincare for its antioxidant properties.
• Animal Feed Additive: Employed as a nutritional supplement to support animal health and growth.

Basic Information

Product Name	Dl-Cysteine Hydrochloride
CAS No.	10318-18-0
Molecular Formula	C3H7NO2S·HCl
Molecular Weight	157.62 g/mol
Synonyms	DL-Cysteine HCl; (±)-2-Amino-3-mercaptopropanoic acid hydrochloride; Cysteine hydrochloride racemic; Racemic cysteine hydrochloride; 3-Mercapto-DL-alanine hydrochloride; H-DL-Cys-OH·HCl; DL-2-Amino-3-mercaptopropionic acid hydrochloride
EINECS	233-674-4

Quality Control

Our Dl-Cysteine Hydrochloride is produced under strict quality management systems. Each batch undergoes comprehensive analytical testing to ensure it meets high-purity standards suitable for pharmaceutical and food-grade applications. Certificates of Analysis (COA) detailing specifications for assay, optical rotation, residue on ignition, heavy metals, and related substances are available upon request to support your regulatory and quality assurance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area. 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 or degradation. Recommended long-term storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	White to almost white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.5% - 101.5% (on anhydrous basis)
Specific Rotation	-0.10° to +0.10° (c=8 in 1N HCl)
pH (5% solution)	1.5 - 2.5
Loss on Drying	≤ 0.5%
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.