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Appearance White crystals or crystalline powder Specific rotation[α]20/D (C=8 in 6N HCl) +27.5to +29.5 Degree Ammonium (NH4) Not more than 0.02% Sulfate (SO4) Not more than 0.030% Iron (Fe) Not more than 10ppm Heavy metal(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 1ppm Other Amino Acids Chromatographically Not detectable Loss on drying Not more than 11.4% Residue on ignition(sulfated) Not more than 0.20% Assay 98.0% to 102% pH 6.0 to 7.5