L-cysteine Base - White Crystalline Powder, Easily Soluble In Water | Aji92/usp28/ep5/fcciv Standard

Following Specification :

Chemical Name: L-Cysteine Base
Molecular Formula: C3H7NO2S
Molecular Weight: 121.15
Characteristics: White crystalline powder,tasteless,easily soluble in water but insoluble in alcohol and ether
Qualified Standard: AJI92/USP28/EP5/FCCIV
Specification:
Specific rotation[a]D20i +8.3A i +9.5A
State of solutioni a Y95.0%
Heavy metals(Pb)i a 10PPm
Residue on ignitioni a 0.1%
Iron(Fe)i a 10PPm
Loss on dryingi a 0.5%
Other amino acidsi Conforms
Arsenic(As2O3)i a 1PPm
Chloride(CI)i a 0.04%
Ammonium(NH4)i a 0.02%
Sulfate(SO4)i a 0.03%
Assayi 98.0i 101.0%
PHi 4.5i 5.5
Packing: 25kg/drum or 25Kg/carton


N-Acetyl-L-Cysteine, CAS NO: 616-91-1
Chemical Name: N-Acetyl-L-Cysteine
Molecular Formula: C 5 H 9 NO 3 S
Molecular Weight: 163.19
Characteristics: White crystals or crystalline powder , strongly acid taste
Specification: AJI92i USP24
Appearancei White crystals or crystalline powder
Assayi 98.5~101.0% 98.5~101.0%
PHi 2.0~2.82.0~2.8
Specific rotation[a]D20A i +5.5A i +7.0A +5.5A i +7.0A
State of solutioni a Y98.0%
Chloride(Cl)i a 0.04%
Ammonium(NH 4 )i a 0.02%
Iron(Fe)i a 20PPm
Heavy metals(Pb)i a 10PPm a 10PPm
Arsenic(As2O3)i a 1PPm
Other amino acidsi Conforms
Loss on dryingi a 0.5%a 1%
Residue on ignitioni a 0.20%a 0.5%
Melting point106~110A
Organic volatile impurities,Meet the requirements
Packing: 25kg/drum or 25Kg/carton