Description

Dl-Cystine CAS NO 923-32-0 is the racemic form of the sulfur-containing amino acid cystine, a key structural component in many proteins and peptides. This compound is essential for applications requiring a stable, disulfide-linked dimer, serving as a crucial building block and biochemical reagent. It is primarily utilized by manufacturers in the pharmaceutical, nutraceutical, and research sectors for synthesis, cell culture media formulation, and as a reference standard.

Application

• Pharmaceutical Synthesis: As a key intermediate in the production of drugs and active pharmaceutical ingredients (APIs) that incorporate disulfide bonds.
• Cell Culture & Microbiology: A vital component in cell culture media and microbiological growth media formulations to support cellular growth and protein expression.
• Biochemical Research: Used as a standard and reagent in biochemical studies, enzymatic assays, and metabolic pathway research.
• Nutraceutical & Dietary Supplements: Incorporated into specialized supplements targeting hair, skin, and nail health due to its high sulfur content.
• Cosmetic Ingredients: Serves as a precursor for ingredients in hair care and skincare products designed to strengthen keratin structures.
• Food Science & Flavor Enhancement: Used in process flavorings and as a nutrient supplement in specialized food products.

Basic Information

Product Name	Dl-Cystine
CAS No.	923-32-0
Molecular Formula	C6H12N2O4S2
Molecular Weight	240.30 g/mol
Synonyms	(±)-Cystine; DL-3,3'-Dithiobis(2-aminopropanoic acid); rac-Cystine; Cystine, DL-; 2-Amino-3-[(2-amino-2-carboxyethyl)dithio]propionic acid; 3,3'-Dithiobis(2-aminopropanoic acid); Cystinic acid; Dicysteine
EINECS	213-072-1

Quality Control

Our Dl-Cystine is produced under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC and titration methods, to ensure high purity and consistency. Certificates of Analysis (COA) detailing identity, assay, and impurity profiles are provided with every shipment to guarantee compliance with your specifications and industry standards.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.5%
Specific Rotation	-215° to -225° (c=1 in 1N HCl)
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
Chloride (Cl)	≤ 0.02%
Sulfate (SO4)	≤ 0.02%

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