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Location：Home > Products > Leading Product
Products
L-Cystine
  Quality standard:USP, AJI92
CAS No.: 56-89-3
Kosher:√
Halal:√
Class:

Chemical Name: L(-)-3,3'-Dithiobis(2-aminopropanoic acid)
Structure Formula:
               

Molecular Formula: C6H12N2O4S2
Molecular Weight: 240.29
Cas No: [56-89-3]
Characteristics: White crystals or crystalline powder; tasteless. Practically insoluble in water, in ethanol and in ether. Dissolves in dilute HCl.
Quality Standards: AJI92, FCCIV, In-house (ref USP24)

 

Item Specifications (AJI92 ) USP 24 FCC IV
Appearance White crystal or crystalline powder; tasteless
Description White crystals or crystalline powder
Identification Infrared absorption spectrum
Specific rotation
[a]D20° 		-215 °- -225 ° -215 ° - -225 ° -215 ° - -225 °
State of solution
(Transmittance)		 ≥ 98.0% --- ---
Chloride(CL) ≤ 0.020% ≤ 0.020% ---
Ammonium(NH4) ≤ 0.02% --- ---
Sulfate(SO4) ≤ 0.020% ≤ 0.020% ---
Iron(Fe) ≤ 20PPm ≤ 20PPm ---
Heavy metals(Pb) ≤ 10PPm ≤ 10PPm 20ppm
Arsenic(As2O3) ≤ 1PPm --- ---
Other amino acids Conforms --- ---
Loss on drying ≤ 0.20% ≤ 0.20% ≤ 0.20%
Residue on ignition (Sulfated) ≤ 0.10% ≤ 0.10% ≤ 0.10%
Assay 98.5-101.0% 98.5-101.0% 98.5-101.0%
PH 5.0-6.5 5.0-6.5 ---
Organic Volatile
impurities		 --- Meets the requirements ---

 

Packaging and Storage: In 25kgs f iber drum double polyethylene bags inside; Preserve in well-closed containers, at controlled room temperature.
R ecommended limit: 1 year.