L-Cystine disodium salt (CAS: 199329-53-8) Product Introduction
L-Cystine disodium salt, with the CAS number 199329-53-8, is a water-soluble sodium salt derivative of L-cystine, also known as Disodium L-cystinate or L-Cystine disodium. Its molecular formula is C₆H₁₀N₂Na₂O₄S₂, and its molecular weight is 272.26 g/mol. As a derivative of L-cystine (a dimeric amino acid formed by two L-cysteine molecules linked by a disulfide bond), it has improved water solubility compared to free L-cystine, making it widely applicable in pharmaceuticals, food, cosmetics, and biochemical research.
Physically, L-Cystine disodium salt appears as a white to off-white crystalline powder or granular solid. It has a melting point of approximately 240℃ (decomposition) and is highly soluble in water, forming a clear solution, while it is slightly soluble in methanol and insoluble in non-polar solvents. It is optically active, with a specific rotation [α]²⁰/D of +8.0° to +12.0° (in water, c=5), and remains stable under normal temperature and pressure when stored in a proper environment.
Chemically, it retains the disulfide bond and amino, carboxyl functional groups of L-cystine, while the sodium salt modification significantly enhances its solubility and bioavailability. It is stable under neutral and weakly alkaline conditions but may decompose under strong acid or high-temperature conditions. The disulfide bond in its structure enables it to participate in redox reactions, playing an important role in maintaining the redox balance of biological systems.
Its core applications cover multiple fields. In the pharmaceutical industry, it serves as a key raw material for preparing nutritional supplements, especially for replenishing cystine in the human body, which is essential for hair, skin, and nail health. It is also used as an intermediate in synthesizing peptide drugs and antioxidants. In the food industry, it acts as a nutritional additive and flavor enhancer, improving the nutritional value and taste of food products. In cosmetics, it is added to skin care products to nourish the skin, enhance skin barrier function, and resist oxidation.
Safety-wise, it is generally recognized as safe (GRAS) for intended uses, non-toxic and non-irritating under normal handling. It should be stored in a sealed, cool, dry, and dark environment at 2-8℃, away from strong oxidants, moisture, and high temperatures, to prevent decomposition and moisture absorption. With its excellent solubility and biological activity, it is an indispensable raw material in pharmaceutical, food, and daily chemical industries.
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