Food grade L-Cysteine Powder supplier CAS 52-90-4 Raw Materials
Related Attributes
Product details
Uses and synthesis of L-Cysteine Powder
L-Cysteine Raw Materials A common amino acid found in living organisms. It is one of the α-amino acids containing sulfur (high school humanistic chemistry elective 5 defines amino acid does not contain sulfur), L-Cysteine CAS 52-90-4 meets nitroprusside (nitroprusside) to show a purple color (because of the color of SH), exists in many proteins, glutathione, and Ag +, Hg +, Cu + and other metal ions can be formed into an insoluble salt of mercaptide (mercaptide). mercaptide). That is, R-S-M′, R-S-M″-S-R (M′, M″ each for the 1-valent, 2-valent metal). Molecular formula C3H7NO2S, molecular weight 121.16, colorless crystal.
L-Cysteine Powder is soluble in water, ethanol, acetic acid and ammonia, insoluble in ether, acetone, ethyl acetate, benzene, carbon disulfide and carbon tetrachloride. It can be oxidized to cystine by air in neutral and weakly alkaline solution.
Applications / Functions of L-Cysteine Powder
- L-Cysteine CAS 52-90-4 is mainly used in medicine, cosmetics and biochemical research. It is used in bakery products to promote the formation of gluten, fermentation, molding, and aging. L-Cysteine Powder can be used in natural fruit juice to prevent the oxidation of vitamin C and prevent the juice from turning brown.L-Cysteine Powder has the effect of detoxification, and can be used in acrylonitrile poisoning, aromatic acid poisoning.
- L-Cysteine Powder Bread Improver; Nutritional Supplement; Antioxidant; Color Protector. It has detoxification effect on acrylonitrile and aromatic acid poisoning; it has preventive effect on radiation damage; it has treatment effect on bronchitis and phlegm; it has absorption effect on alcohol and transforms it into acetaldehyde in the body. According to GB2760-96, it is allowed to be used in spices.
- L-Cysteine CAS 52-90-4 is used for the treatment of eczema, urticaria, freckles and other skin diseases, its series of products are widely
- L-Cysteine CAS 52-90-4 is used in medicine, food and cosmetics industrial use for biochemical research, medicine used as hepatitis, liver poisoning, radioactive drug poisoning, antimony agent poisoning and other antidotes.
- L-Cysteine Powder is mainly used in medicine, cosmetics, biochemical research. It is used in bread to promote the formation of gluten, fermentation, molding and aging. Used in natural fruit juice to prevent vitamin C oxidation and prevent the juice from turning brown. The product has a detoxifying effect and can be used in acrylonitrile poisoning and aromatic acid poisoning.L-Cysteine Raw Materials also has the effect of preventing radiation damage to the human body, and is also a drug for the treatment of bronchitis, especially as a phlegm-melting drug (mostly in the form of Acetyl L-Cysteine Methyl esterate). In cosmetics, it is mainly used in beauty lotion, perm solution, and skin care creams to prevent sunburn.
- L-Cysteine Raw Materials are widely used in pharmaceutical, food and cosmetic industries.
- L-Cysteine Raw Materials are mainly used in medicine, cosmetics, and biochemical research. It is used in bakery materials to promote the formation of gluten and fermentation, molding, and prevent aging. Used in the treatment of eczema, hives, freckles and other skin diseases.
- L-Cysteine Powder NMDA Glutamate Receptor Stimulant
L-Cysteine Powder properties and stability
L-Cysteine Powder colorless to white fine columnar crystals or white crystalline powder, with a slight special smell and taste (slightly acidic). Reducing, antioxidant and preventing non-enzymatic browning.L-Cysteine CAS 52-90-4Melting point 175℃(decomposition). Soluble in water, aqueous solution is acidic, pH value in 3% is 1.2, 1% is 1.7, 0.1% is 2.4. L-Cysteine CAS 52-90-4 is also soluble in ethanol, ammonia and acetic acid, insoluble in ether, acetone, benzene, carbon disulfide and chloroform. L-Cysteine is one of the amino acids, but is a non-essential amino acid.
Grade Comparison.
| Parameter |
Food Grade |
Pharma Grade |
Cosmetic Grade |
Test Method |
| Purity |
≥98.5% |
≥99.5% |
≥99.0% |
HPLC |
| Heavy Metals |
≤10ppm |
≤5ppm |
≤3ppm |
ICP-MS |
| Residue on Ignition |
≤0.1% |
≤0.05% |
≤0.1% |
550°C ignition |
| Moisture |
≤0.5% |
≤0.3% |
≤0.5% |
Karl Fischer |
| Microbial Limits |
≤1000cfu/g |
≤100cfu/g |
≤500cfu/g |
Plate count |
Production method of L-Cysteine Powder
- 1.Tin grain reduction method Dissolve cysteine in dilute hydrochloric acid, filter, filtrate add tin grain temperature reflux for 2 h. Dilute the reduction solution with water, remove the remaining tin grains, saturated with hydrogen sulfide, filtration, filtrate slag with a small amount of water, wash, filtrate, combined under reduced pressure, concentrated, cooled crystallization, filtration, drying L-cysteine hydrochloride.
- 2. Electrolysis reduction method Add distilled water, hydrochloric acid, cystine into the electrolysis tank and stir to dissolve, maintain at 50 ℃ below the electrolysis to the end point. The electrolyte will be passed through the hydrogen sulfide for a few hours, filtration. The filtrate is decolorized by adding activated carbon, concentrated under reduced pressure after filtration, crystallized by cooling, filtered and dried to obtain L-cysteine hydrochloride.
- 3. Synthesis: can be hydrolyzed by protein (such as human hair) hydrochloric acid, then treated with copper oxide, hydrogen sulfide decomposition. Can also be obtained from the degradation of cystine.
- tin reduction method will dissolve cystine in dilute hydrochloric acid, filtration, filtrate add tin reflux temperature 2h. will reduce the solution diluted with water, remove the remaining tin particles, through the hydrogen sulfide saturation, filtration, filtering, slag with a small amount of water to wash, wash, filtrate, combined, concentrated under reduced pressure, cooled to crystallization, filtration, drying to get L-cysteine hydrochloride.
- Electrolysis reduction method will be distilled water, hydrochloric acid, cystine into the electrolysis tank stirring dissolved, maintained at 50 ℃ below the electrolysis to the end point. The electrolyte will be passed through the hydrogen sulfide for a few hours, filtration. The filtrate was decolorized by adding activated carbon, concentrated under reduced pressure after filtration, crystallized by cooling, filtered and dried to obtain L-cysteine hydrochloride.
l cysteine vs nac.
Comparison of application fields.
| Application fields |
Advantages of L-cysteine |
Advantages of NAC |
| Food industry |
Good thermal stability, key ingredient for bread improvement |
Not applicable |
| Respiratory diseases |
Moderate effect |
Preferred drug (US FDA approved) |
| Mental health |
Less research |
Proven to improve obsessive-compulsive disorder and addictive behavior (2024 study) |
| Liver protection |
High dose required |
First-line antidote for acetaminophen poisoning |
| Cosmetics |
Whitening, hair care |
Anti-aging, anti-inflammatory |
FAQ.
Q: Fermentation vs synthetic production?
A: Fermentation offers more stable rotation (+9.2±0.3°) with lower solvent risk, but costs 25-30% more.
Q: How to identify quality L-Cysteine?
A: Three-step verification:
Solubility test (should be clear)
Sulfur odor check (mild characteristic)
Potassium ferricyanide reaction (instant color)
Q: Difference from N-Acetylcysteine?
A: NAC has 30% higher bioavailability but poor thermal stability - L-Cysteine remains preferred for food applications.
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