Description

L-Cystine is a stable, oxidized dimer of the sulfur-containing amino acid L-cysteine, essential for protein structure and biological function. It serves as a critical building block and reducing agent in numerous biochemical and industrial processes, valued for its role in maintaining cellular redox balance. This high-purity ingredient is primarily sought by manufacturers in the pharmaceutical, nutraceutical, and food & beverage industries for its application in parenteral nutrition, dietary supplements, and as a processing aid.

Application

• Pharmaceutical Formulations: Used as a key ingredient in infusion solutions for parenteral and enteral nutrition, and in tablets/capsules for dietary supplements.
• Nutraceuticals & Dietary Supplements: Incorporated into capsules, tablets, and powders aimed at supporting hair, skin, and nail health, as well as overall antioxidant defense.
• Food & Beverage Fortification: Employed as a nutritional supplement to enhance the amino acid profile in specialized foods, medical nutrition products, and sports beverages.
• Biochemical Research & Cell Culture: Serves as a vital component in cell culture media and as a reagent in various biochemical and microbiological research applications.
• Cosmetic & Personal Care: Utilized in hair care and skin care formulations for its potential strengthening and protective properties.
• Animal Feed Additive: Added to feed for livestock and pets to support optimal growth, feathering, and overall health.

Basic Information

Product Name	L-Cystine
CAS No.	56-89-3
Molecular Formula	C6H12N2O4S2
Molecular Weight	240.30 g/mol
Synonyms	(+)-Cystine; L-(-)-Cystine; Dicysteine; 3,3'-Dithiobis(2-aminopropanoic acid); (R,R)-3,3'-Dithiobis(2-aminopropanoic acid); Gelucystine; Cystinic acid; β,β'-Dithiodialanine
EINECS	200-296-3

Quality Control

Our L-Cystine is manufactured under strict quality management systems. Each batch is tested to ensure it meets stringent specifications for identity, purity, and safety, aligning with major pharmacopoeial standards such as USP, EP, and JP. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.5% - 101.0%
Specific Rotation	-215° to -225°
Loss on Drying	≤ 0.2%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 10 ppm
Related Substances (HPLC)	Total impurities ≤ 1.0%
Chloride	≤ 0.02%
Sulfate	≤ 0.02%

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