Description

L-Cystine, Disodium Salt is the disodium salt derivative of the essential amino acid L-Cystine. This compound is valued for its enhanced solubility and stability in aqueous formulations compared to the free amino acid. It serves as a critical raw material and biochemical intermediate in the pharmaceutical, nutraceutical, and research sectors. Its primary utility lies in providing a bioavailable source of cysteine for synthesis and metabolic processes.

Application

• Pharmaceutical Synthesis: Used as a key intermediate in the production of active pharmaceutical ingredients (APIs), particularly those requiring a cysteine moiety.
• Nutraceutical & Dietary Supplements: Incorporated into formulations designed to support antioxidant defense, liver health, and protein synthesis due to its role as a precursor to glutathione.
• Cell Culture Media: An essential component in defined media for mammalian cell culture, supporting cell growth and protein expression in biopharmaceutical manufacturing.
• Biochemical Research: Employed as a substrate or standard in enzymatic studies, metabolic pathway analysis, and proteomics research.
• Cosmetic & Personal Care: Utilized in hair care and skin care products for its potential role in keratin structure and antioxidant properties.
• Food & Beverage Fortification: Acts as a nutritional additive for specialized dietary products and clinical nutrition formulas.

Basic Information

Product Name	L-Cystine, Disodium Salt
CAS No.	64704-23-0
Molecular Formula	C6H10N2Na2O4S2
Molecular Weight	292.26 g/mol
Synonyms	L-Cystine disodium salt; Disodium L-cystinate; Cystine disodium salt; Cystinic acid disodium salt; (R,R)-3,3'-Dithiobis(2-aminopropionic acid) disodium salt; L-3,3'-Dithiodialanine disodium salt; Alanine, 3,3'-dithiobis-, disodium salt, (R-(R*,R*))-
EINECS	Contact for details

Quality Control

Our L-Cystine, Disodium Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) detailing specifications such as assay, optical rotation, heavy metals, and residual solvents. Production can adhere to relevant standards including USP, EP, and FCC for pharmaceutical and food-grade applications 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). This material is hygroscopic (moisture-sensitive); the original container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥98.0%
Specific Rotation	+95° to +105° (c=1 in 1N HCl)
pH (5% solution)	6.0 - 8.0
Loss on Drying	≤1.0%
Residue on Ignition (Sulfated Ash)	28.0% - 32.0%
Heavy Metals (as Pb)	≤10 ppm
Related Substances (HPLC)	Total impurities ≤2.0%

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