Appearance
White crystals or crystalline powder
Specific rotation[α]20/D
(C=10 in 2N HCl)
+31.5 to +32.4°
State of solution
(Transmittance)
Clear and colorless not less than 98.0%
Chloride (Cl)
Not more than 0.020%
Ammonium (NH4)
Not more than 0.02%
Sulfate (SO4)
Not more than 0.020%
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 0.10%
Residue on ignition(sulfated)
Not more than 0.10%
Assay
99.0% to 100.5%
pH
3.0 to 3.5