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L-Cysteine CAS No. 52-90-4 

Assay: 98%-101.5%
Appearance: White crystals or crystalline powder
Capacity: 500tons/year
Packaging: 25kg/fiber drum
Sample: available

related documents:

  • COA of L-Cysteine CAS 52-90-4



L-Cysteine Quick Details

Product Name: L-Cysteine

Other name : Cysteine

CAS No.: 52-90-4

Molecular Fomula: C3H7NO2S

Molecular weight:121.16

Appearance: White crystals or crystalline powder

L-Cysteine Typical Properties

Item Specifications
Appearance White crystals or crystalline powder
Identification Infrared absorption spectrum
Assay 98%~101.5%
PH 4.5~5.5
Specific rotation +8.3°~+9.5°
Transmittance ≥95%
Chloride(Cl) ≤0.040%
Sulfate(SO4) ≤0.030%
Iron(Fe) ≤10ppm
Ammonium ≤0.020%
Heavy metal ≤10ppm
Arsenic ≤1ppm
Loss on drying ≤0.5%
Residue on ignition ≤0.10%


L-Cysteine is widely used in medicine, food, cosmetics industry and biochemical research.

1. Medicine: used to treat skin diseases such as eczema, urticaria and freckles. It can also be used as an antidote for hepatitis, liver poisoning, radiopharmaceutical poisoning, antimony poisoning and the like. It has the effect of treating bronchitis and reducing phlegm.

2. Food: used in bread materials to promote the formation of gluten, promote fermentation, mold release, and prevent aging. Used in natural fruit juices to prevent oxidation of vitamin C and prevent fruit juices from turning brown.

3. Cosmetics: Antioxidant; Color protectant. Mainly used in beauty water, permanent wave, sun-proof skin cream, etc.

L-Cysteine Packaging and Shipping 

25kg/fiber drum

L-Cysteine Storage  

Storage:Keep container tightly closed, store in a cool, dry, well-ventilated area.

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