Item

Standard

Appearance

White crystals or crystalline powder

Specific rotation[α]20/D

(C=5,1mol/L HCL)

-11.3 to -12.1°

State of solution

(Transmittance)

Clear and colorless

Not less than 95.0%

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 20ppm

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 0.20%

Residue on ignition(sulfated)

Not more than 0.10%

Assay

98.5 to100.5%

pH

5.0 to 6.5