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Appearance White crystals or crystalline powder Specific rotation[α]20/D (C=8 in 1N HCl) +5.5o to +7.0o Transmittance Not less than 98.0% Chloride(C1) 19.89% to 20.29% Sulfate (SO4) Not more than 0.02% Iron (Fe) Not more than 10ppm Heavy metal(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 1ppm Ammonium(NH4) Not more than 0.02% Other amino acids Chromatographically not detectable Loss on drying 8.5% to 12.0% Residue on ignition(sulfated) Not more than 0.10% Assay 99.0%to100.5% PH 1.5 to 2.0