Item

Standard

Analysis data

Appearance

Off-White crystals or crystalline powder

Conforms 

Specific rotation(a)D20

-74.0o to –77.0o

-74.19

Transmittance

Not less than 95.0%

96.4%

Chloride(C1)

Not more than 0.02%

<0.02%

Ammonium(NH4)

Not more than 0.02%

<0.02%

Sulfate (SO4)

Not more than 0.02%

<0.02%

Heavy metals(Pb)

Not more than 10ppm

<10ppm

Iron(Fe)

Not more than 10ppm

<10ppm

Arsenic(As2O3)

Not more than 1 PPM

<1ppm

Other Amino Acids

Conforms

Conforms

Loss on drying

Not more than 0.20%

0.15%

Residue on ignition

Not more than 0.1%

0.09%

Assay

98.5-101.0%

99.1%

PH

5.0～6.5

5.4