Item Standard Appearance White crystals 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 acidsomatographically 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
