Assay 98.0～101.0% pH 4.5～5.5 Specific rotation[]D25 +8.3°～+9.5° State of solution (Transmittance ) ≥95.0% Chloride(Cl) ≤0.04% Ammonium(NH4) ≤0.02% Sulfate(SO4) ≤0.03% Iron(Fe) ≤10ppm Heavy metals(Pb) ≤10ppm Arsenic(As) ≤1ppm Other amino acids Chromatographically not detectable Loss on drying ≤0.50% Residue on ignition ≤0.10%