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L-Cysteine  CAS NO.52-90-4

Mainly used in medicine, cosmetics, biochemical research, etc. Used in bread ingredients to promote the formation of gluten and promote fermentation, mold release, and aging prevention. Used in natural juices to prevent the oxidation of vitamin C and prevent the juices from turning brown. This product has detoxification effect and can be used for acrylonitrile poisoning and aromatic acid poisoning. This product 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 medicine (mostly used in the form of acetyl L-cysteine methyl ester. Cosmetics are mainly used for cosmetic water, Perm solution, skin cream for preventing sun exposure, etc.

Additional information

Weight 25 kg
Dimensions 35 × 35 × 45 cm

White crystalline powder

Loss on drying

Max. 0.20%

Specification grade



99% min

Product data and descriptions listed are typical values, not intended to be used as specification.

Identifying Information

Product Name:  L-Cysteine
Synonyms: (+)-2-Amino-3-mercaptopropionic acid; L-beta-Mercaptoalanine
CAS-No.: 52-90-4
EINECS.: 200-158-2
Molecular Formula: C3H7NO2S
Molecular weight: 121.15

Chemical Properties

Boiling Point: 293.9±35.0 °C at 760 mmHg
Melting point: 220 °C (dec.)(lit.)
Flash Point: 131.5±25.9 °C
Density: 1.3±0.1 g/cm3
Index of Refraction: 1.550
Vapour Pressure: 0.0±1.3 mmHg at 25°C
Water solubility: 280 g/L (25 ºC)

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