Item

Standard

Analysis data

Appearance

White crystals or crystalline powder

conforms

Specific rotation[α]20/D
(C=2,H2O)

-14.0°to-17.0°

-15.5°

Transmittance

Not less than 95.0%

98.0%

Heavy metal(Pb)

Not more than 20ppm

<10ppm

Arsenic(As2O3)

Not more than 2ppm

<2ppm

Other amino acids

Chromatographically
not  detectable

conforms

Loss on drying

Not more than 0.50%

0.3%

Residue on ignition

Not more than 0.30%

0.2%

Assay

98.0to102.0%

99.3%

pH

1.7to2.8

2.3