L-Cysteine CAS 52-90-4
Colorless to white fine columnar crystals or white crystalline powder with a slightly characteristic odor and taste (slightly acidic). L-Cysteine has reducing properties and acts as an antioxidant and prevents non-enzymatic browning. Melting point 175℃ (decomposes). Soluble in water; the aqueous solution is acidic. pH values are 1.2 at 3%, 1.7 at 1%, and 2.4 at 0.1%. Also soluble in ethanol, ammonia, and acetic acid; insoluble in ether, acetone, benzene, carbon disulfide, and chloroform. It is an amino acid, but not an essential one.
|
Specific optical rotation[a]D20° |
+8.3°~+9.50 |
|
State of solution(Transmittance) |
≥95.0% |
|
Assay |
98.0%～101.0% |
|
Heavy metals(Pb) |
≤10PPM |
|
Chloride(C1) |
≤0.04% |
|
Arsenic(As₂O₃) |
≤1PPM |
|
Loss on drying |
≤0.50% |
|
Residue on ignition |
≤0.10% |
|
pH value |
4.5～5.5 |
|
Iron(Fe) |
≤10PPM |
|
Ammonium(NH₄) |
≤0.02% |
|
Sulfate(SO4) |
≤0.020% |
1. Food Industry (Major Application Area)
Flour Improver and Baked Goods: This is the largest application of L-cysteine. As a reducing agent, it can break the disulfide bonds in proteins in dough, significantly reducing the gluten strength and elasticity of the dough, thereby:
Shortening kneading time and increasing production efficiency.
Improving dough extensibility, facilitating mechanized operations (such as making ramen and biscuits).
Making bread texture more uniform and larger in volume.
Natural Flavor Enhancer: Used in the production of flavorings for meat, seafood, and bread, producing a pleasant "meaty" aroma.
Antioxidant: Due to its antioxidant properties, L-Cysteine can be used in foods such as fruit juice and milk powder to prevent the destruction of vitamin C and the oxidation of fats, extending shelf life.
Nutritional Supplement: Added to foods lacking methionine (another essential amino acid) to improve their nutritional value.
2. Pharmaceutical Field
Liver Protection and Detoxification: A key raw material for the synthesis of glutathione. Glutathione is one of the most important antioxidants and detoxifiers in the human body. L-Cysteine helps the liver break down toxins and treats drug-induced liver injury, alcoholic liver disease, etc.
Expectorant and antitussive: L-Cysteine can break down the disulfide bonds in mucin in sputum, reducing sputum viscosity and making it easier to cough up. It is often used as an adjunct treatment for colds and chronic bronchitis.
Radiation protection: L-Cysteine reduces the damage to the body caused by radiation therapy.
Promotes wound healing.
3. Cosmetics and Personal Care
Skin whitening and anti-oxidation: As a precursor to glutathione, it can inhibit melanin production, thus achieving whitening and spot-fading effects. L-Cysteine also neutralizes free radicals and delays skin aging.
Hair care: L-Cysteine is one of the important amino acids in hair keratin. Adding it to shampoos and conditioners can help repair damaged hair and maintain its strength and elasticity.
Perming agents: In gentle perming agents, it can help break and rebuild disulfide bonds in hair, reducing damage.
4.Feed additives
These are added to feed as essential amino acids to promote livestock and poultry growth and improve feed utilization.
1. Biocompatibility and absorbability: As a naturally occurring amino acid, it is easily absorbed and utilized by the body, with high safety.
2. Water solubility: Easy to add and use in various water-based systems.
3. Multifunctionality: Combining the functions of a reducing agent, antioxidant, nutritional supplement, detoxifier, expectorant, and whitening ingredient, its applications span multiple industries.
25kgs/drum, 9tons/20’container
25kgs/bag, 20tons/20’container
L-Cysteine CAS 52-90-4
L-Cysteine CAS 52-90-4
