L-Cystine (L-Cystine) is an organic substance, molecular formula C6H12N2O4S2, molecular weight 240.3, white hexagonal plate crystal or white crystalline powder, soluble in dilute acid and alkali solutions, extremely insoluble in water, insoluble in ethanol. There is a small amount in the protein, mostly contained in the keratin of hair, finger claws, etc.
In medicine, it is used as raw materials for the production of antidotes and expectorants. In the food industry, it is used as a dairy additive and a quick accelerator for bread. After heating with sugars in food, it can produce various special flavors and prevent the oxidation of fats. The cosmetics industry is the raw material for the production of cold ironing essence.
Physical property data
1. Properties: white hexagonal plate crystal or crystalline powder. Odorless, tasteless. [4]
2. Density (g/mL, 25/4ºC) : 1.677
3. Relative density: 1.677
4. Melting point (ºC) : point 260 ~ 261ºC (decomposition)
5. Specific rotation (º) : [α] D20-223.4 ° (C= 1,1 mol/L hydrochloric acid).
6. Solubility: soluble in dilute acid and alkaline solution, very slightly soluble in water, insoluble in ethanol, ether, benzene and chloroform.
Toxicological data
1. Acute toxicity: oral LD50:25g/kg in rats
2. Other multi-dose toxicity: rat transoral TDLo: 279mg/kg/93D-C
Property and stability
1. Stable under normal temperature and pressure.
2. Exists in tobacco leaves.
3. It is widely found in hair, hair, bone and horn.
4. There are three isomers: left-handed, right-handed and racemic.
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