L-Cystine  CAS NO：56-89-3

Chemical Name	L-Cystine
Molecular Structure
Molecular Formula	C6H12N2O4S2
Molecular Weight	240.29
Characteristics	A colorless or white crystalline substance of hexagon,or crystalline powder,easily soluble in acid and alkali,insoluble in water and organic solvents such as alcohol, ethyl ether.
Packing	25㎏/drum，25㎏/carton
Quality  Standard	AJI92/USP28/EP5/FCCIV
Specification
Specific rotation[a]D20°	-215°～-225°
State of solution	≥98.0%
Heavy metals(Pb)	≤10PPm
Residue on ignition	≤0.1%
Iron(Fe)	≤20PPm
Loss on drying	≤0.02%
Other amino acids	Conforms
Arsenic(As2O3)	≤1PPm
Chloride(CI)	≤0.02%
Ammonium(NH4)	≤0.02%
Sulfate(SO4)	≤0.02%
Assay	98.0～101.0%
PH	5～6.5