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Appearance White crystals or crystalline powder Specific rotation[α]20/D (C=8, 1mol/L HCL) +5.6 to +8.9° State of solution (Transmittance) Clear and colorless Not less than 98.0% Heavy metal(Pb) Not more than 10 ppm Arsenic(As2O3) Not more than 1ppm Sulfate(SO4) Not more than0.02% Other amino acids Chromatographically Not detectable Loss on drying Not more than 1.0% Residue on ignition(sulfated) Not more than 0.1% Assay 98.0 to102.0% pH 1.5 to 2.0