L-Cystine

Product name: L-Cystine

Synonyms: L(-)-3,3'-Dithiobis(2-aminopropanoic acid); 2-Amino-3-[(2-amino-2-carboxyethyl)dithio]propanoic acid

Formula: C6H12N2O4S2

Molecular: 240.29

CAS number: 56-89-3

Description: Fine white crystalline powder

Specific rotation: -215° ~ -225°

Chloride(Cl): NMT 0.05%

Ammonium(NH4): NMT 0.02%

Sulfate(SO4): NMT 0.02%

Iron(Fe): NMT 10 ppm

Heavy metals: NMT 20 ppm

Lead: NMT 5 ppm

Arsenic: NMT 1 ppm

Other amino acids: Chromatographically not detectable

Loss on drying: NMT 0.20%

Residual solvents: NMT 0.10%

Assay: 98.5% ~ 101.5%

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