Description

L-Cystine Dihydrochloride is a high-purity, crystalline derivative of the essential amino acid L-Cystine, widely used as a critical raw material and intermediate in pharmaceutical and nutritional synthesis. Its enhanced solubility and stability in acidic formulations make it a preferred choice for precise biochemical applications. This compound is essential for manufacturers in the pharmaceutical, nutraceutical, and research sectors requiring a reliable source of sulfur-containing amino acid precursors.

Application

• Pharmaceutical Synthesis: A key intermediate in the production of injectable drugs, parenteral nutrition solutions, and specialized amino acid infusions.
• Nutraceutical & Dietary Supplements: Used as a vital ingredient in high-end supplements targeting antioxidant support, liver health, and connective tissue repair.
• Cell Culture Media: An essential component in defined media formulations for mammalian cell culture and biopharmaceutical production.
• Biochemical Research: Serves as a standard and reagent in proteomics research, enzymatic studies, and metabolic pathway analysis.
• Cosmeceuticals: Incorporated into advanced skincare formulations for its role in keratin synthesis and antioxidant properties.
• Food & Beverage Fortification: Used for nutritional enhancement in specialized medical foods and clinical nutrition products.

Basic Information

Product Name	L-Cystine Dihydrochloride
CAS No.	30925-07-6
Molecular Formula	C6H12N2O4S2·2HCl
Molecular Weight	313.22 g/mol
Synonyms	L-Cystine dihydrochloride; (R,R)-3,3'-Dithiobis(2-aminopropanoic acid) dihydrochloride; Cystine dihydrochloride; L-(-)-Cystine dihydrochloride; Dicysteine dihydrochloride; (2R,2'R)-3,3'-Disulfanediylbis(2-aminopropanoic acid) dihydrochloride; H-Cys(SH)-Cys(SH)-OH·2HCl; L-Cystine HCl
EINECS	250-394-5

Quality Control

Our L-Cystine Dihydrochloride is manufactured under strict quality management systems. Each batch is tested to ensure it meets high-purity standards suitable for pharmaceutical and nutritional applications. A comprehensive Certificate of Analysis (COA) is provided with each shipment, detailing parameters such as assay, optical rotation, heavy metals, and residual solvents. We can supply material compliant with various pharmacopeial standards, including USP and EP, upon request.

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 nature, the container must be kept tightly sealed after opening to prevent moisture absorption. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.5% - 101.5%
Specific Rotation	+95° to +105° (c=1 in 1N HCl)
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
Chloride Content	21.5% - 23.0%

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