Description

Dl-Cysteine CAS NO 3374-22-9 is a synthetic, racemic mixture of the sulfur-containing amino acid cysteine, offering a versatile and cost-effective alternative to the naturally occurring L-isomer. This compound is valued for its role as a reducing agent, antioxidant, and precursor in various chemical syntheses. It serves as a critical raw material for industries including pharmaceuticals, food and beverage, cosmetics, and biochemical research.

Application

• Pharmaceutical Intermediates: Used as a key building block in the synthesis of active pharmaceutical ingredients (APIs), particularly for drugs targeting liver protection and mucolytic therapies.
• Food & Beverage Additives: Functions as a dough conditioner in baking, a flavor enhancer (especially in meat and savory flavors), and an antioxidant to prevent spoilage.
• Cosmetics & Personal Care: Employed in hair waving and straightening formulations, as well as in skin care products for its antioxidant and purported anti-aging properties.
• Biochemical Research: Serves as a reagent in cell culture media and as a substrate or standard in various enzymatic and metabolic studies.
• Animal Feed Nutrition: Incorporated as a source of sulfur amino acids to support animal health and growth in feed formulations.
• Chemical Synthesis: Acts as a chiral precursor or reducing agent in organic synthesis and as a stabilizer in certain chemical processes.

Basic Information

Product Name	Dl-Cysteine
CAS No.	3374-22-9
Molecular Formula	C3H7NO2S
Molecular Weight	121.16 g/mol
Synonyms	DL-Cysteine; (±)-Cysteine; rac-Cysteine; 2-Amino-3-mercaptopropanoic acid; 3-Mercapto-DL-alanine; Cysteine, DL-; DL-2-Amino-3-mercaptopropionic acid; NSC 87444
EINECS	222-161-2

Quality Control

Our Dl-Cysteine is manufactured under a strict quality management system. It can be produced to meet various grade specifications, including Food Grade (FCC) and Pharmaceutical standards. Every batch undergoes rigorous analytical testing, including assay, optical rotation, and impurity profile analysis via HPLC. A comprehensive Certificate of Analysis (COA) is provided with each shipment to ensure traceability and compliance with your specifications.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.0% - 101.0%
Specific Rotation	-0.10° to +0.10° (c=1 in 1N HCl)
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.