Appearance White fine crystals or White power Specific rotation(20/D) (C=4 in 6N HCL) -14.0 to -16.0°Degree Chloride (Cl) Not more than 0.1% Heavy metals(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 1ppm Other amino acids Chromatographically Not detectable Loss on drying Not more than 0.20% Residue on ignition(sulfated) Not more than 0.10% Assay 98.0 to100.5%