Appearance White crystals or crystalline powder
Specific rotation[α]20/D
(C=2,H2O) -14.0°to-17.0°
Transmittance Not less than 95.0%
Heavy metal(Pb) Not more than 20ppm
Iron (Fe) Not more than 10ppm
Arsenic(As2O3) Not more than 2ppm
Chloride (Cl) Not more than 0.020%
Sulfate (SO4) Not more than 0.10%
Other amino acids Chromatographically not detectable
Loss on drying Not more than 0.50%
Residue on ignition Not more than 0.30%
Assay 98.0to102.0%
pH 1.7to2.8