Item

Standard

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