L-Cysteine Base   CAS NO：52-90-4

Chemical Name	L-Cysteine Base
Molecular Structure
Molecular Formula	C3H7NO2S
Molecular Weight	121.15
Characteristics	White crystalline powder,tasteless,easily soluble in water but insoluble in alcohol and ether
Packing	25㎏/drum，25㎏/carton
Qualified Standard	AJI92/USP28/EP5/FCCIV
Specification
Specific rotation[a]D20°	+8.3°～+9.5°
State of solution	≥95.0%
Heavy metals(Pb)	≤10PPm
Residue on ignition	≤0.1%
Iron(Fe)	≤10PPm
Loss on drying	≤0.5%
Other amino acids	Conforms
Arsenic(As2O3)	≤1PPm
Chloride(CI)	≤0.04%
Ammonium(NH4)	≤0.02%
Sulfate(SO4)	≤0.03%
Assay	98.0～101.0%
PH	4.5～5.5