Item

Specification

Description

White crystals or crystalline powder

Specific rotation[a]D20          

+24.0°~+26.5°      

State of solution

≥95.0%

Chloride(Cl)

≤0.04%

Ammonium (NH4)

≤0.02%

Sulfate(SO4)

≤0.03%

Iron(Fe)

≤30ppm

Arsenic(As2O3)

≤1ppm

Heavy metals(Pb)  

≤10ppm

Other amino acids

Chromatographically not detectable

Loss on drying                              

≤0.5%

Residue on ignition                          

≤0.20%  

Assay

98.0~101.0%

Ph

5.0~7.0