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Appearance White crystals or crystalline powder Specific Rotation [20/D] (C=1 in H2O) +30.0 ° to +33.0° Chloride (Cl) Not more than 0.10% Iron Not more than 10ppm Heavy metal(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 1ppm Other amino acids Not more than 0.3% Loss on drying Not more than 0.5% Residue on ignition(sulfated) Not more than 0.10% Assay 98.5to102.0%