L-cysteineAssay: 98.0% to 101.5%

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L-cysteine MF: C3H7NO2S Molecular Weight: 121.16 Statutory number (CAS) :52-90-4 Identification: Infrared Spectroscopy Specific Rotation: +8.3 ° ~ +9.5 ° Dissolved status: ≥ 95.0% Assay: 98.0% to 101.5% Heavy metals: ≤ 10ppm Chloride: ≤ 0.04% Arsenic Salt: ≤ 1ppm Loss on drying: ≤ 0.5% Residue on ignition: ≤ 0.1% PH: 4.5 ~ 5.5 Iron salts: ≤ 10ppm Ammonia salt: ≤ 0.02% Sulfate: ≤ 0.03% Packing: 25kg / barrel Appearance : Cysteine is white crystal or crystalline powder, soluble in water, slightly smelly, and insoluble in ethanol, insoluble in ether and other organic solvents. Melting point 240 ℃, the monoclinic system. As one of the sulfur amino acid cysteine, is a non-essential amino acids in vivo by the sulfur atom of the methionine and serine hydroxyl oxygen atom relative to replacement through cystathionine synthesis, starting from the cysteine to generate glutathione glycylglycine. Cysteine acid is stable in neutral and alkaline solution, easily oxidized to cystine.

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