Cystine Disodium Salt Powder
As a salt of a dibasic amino acid, Cystine Disodium Salt exhibits typical amphoteric characteristics, with its ionization state closely dependent on the pH of the solution.
- In acidic conditions (pH < 3.0): The carboxylate anions (−COO−) accept protons and are converted back to carboxyl groups (−COOH). As the pH decreases, the solubility of the compound drops sharply, and free L-cystine precipitates out of the solution. This reaction is the basis for the industrial preparation of L-cystine from Cystine Disodium Salt—acidification with dilute hydrochloric acid or sulfuric acid triggers crystallization of L-cystine with high purity.
- In neutral to weakly alkaline conditions (pH 7.0–9.0): The compound exists stably as a zwitterion, with carboxylate groups in the anionic form and amino groups protonated to −NH3+. This is the most stable state for Cystine Disodium Salt in aqueous solutions, and it remains fully dissolved, making it suitable for formulating oral or injectable preparations.
- In strongly alkaline conditions (pH > 12.0, with heating): The disulfide bond is prone to cleavage under the action of strong bases (e.g., 40% NaOH solution), producing sodium cysteinate. Prolonged heating accelerates this hydrolysis reaction, which is a common method for preparing L-cysteine from Cystine Disodium Salt in the laboratory.
The isoelectric point (pI) of the corresponding free L-cystine is approximately 5.05, but Cystine Disodium Salt itself does not have a distinct isoelectric point due to its pre-ionized carboxylate groups; its solubility minimum occurs at pH close to the pI of L-cystine.
Send product request
Other supplier products
 |
Hydantoin Wholesale Price | Hydantoin in Chemical Industry Intermediates for Organic Synthesis: Hydantoin is a valuable intermediate in the synthesis of various organic compou... |
 |
Glycyl-glycyl-glycine Manufacturer | Glycyl-glycyl-glycine, also known as triglycine, is a tripeptide composed of three glycine molecules linked by peptide bonds. Its usage features ar... |
 |
L-Aspartic acid monosodium salt monohydrate | L-Aspartic acid monosodium salt monohydrate is a chemically stable, water-soluble derivative of L-aspartic acid—one of the 20 proteinogenic a... |
 |
L-Alanyl-L-Tyrosine Manufacturer | The uses of L-Alanyl-L-TyrosineThe field of medicineNutritional supplements: As derivatives of amino acids, they can provide the human body with ne... |
 |
Complexation Properties of L-cysteine S-sulfate sodium salt | Complexation Properties of L-cysteine S-sulfate sodium salt L-cysteine S-sulfate sodium salt has multiple coordination sites (amino nitrogen, carbo... |
Same products
 |
Easy-cleaning Silicone-Modified Waterborne UV Resin | Seller: Guangzhou Human New Material Science and Technology Co., Ltd | LUV533 is a high-performance, silicone-modified hexafunctional waterborne UV resinengineered to d... |
 |
Water-based Soft-Touch Resin for Consumer Electronics | Seller: Guangzhou Human New Material Science and Technology Co., Ltd | Water-based Soft-Touch Resinis an advanced coating material formulated to deliver a luxurious, ve... |
 |
Conformal Coatings | Seller: Guangzhou Human New Material Science and Technology Co., Ltd | The conformal coatingsprovide good adhesion to metal, PCB and other substrates after curing at ro... |
 |
Metalized & Laser Transfer coating | Seller: Guangzhou Human New Material Science and Technology Co., Ltd | Metallized and laser transfer coatingsare designed with sustainability in mind, ensuring minimal ... |
 |
Hydrophilic coatings for Air Conditioner | Seller: Guangzhou Human New Material Science and Technology Co., Ltd | A water-based coating combination applied on the surface of aluminum foil, which forms a layer wi... |
