Item
Standard
Analysis data
Appearance
White crystals or crystalline powder
Conforms
Specific rotation[α]20/D
(C=4,H2O)
+25.8 to +27.0°
26.2°
State of solution
(Transmittance)
Clear and colorless
Conforms
Chloride (Cl)
Not more than 0.020%
<0.02%
Ammonium (NH4)
Not more than 0.02%
<0.02%
Sulfate (SO4)
Not more than 0.020%
<0.02%
Iron (Fe)
Not more than 10ppm
<10ppm
Heavy metal(Pb)
Not more than 10ppm
<10ppm
Arsenic(As2O3)
Not more than 1ppm
<1ppm
Other amino acids
No spot
Conforms
Loss on drying
Not more than 0.20%
0.14%
Residue on
ignition(sulfated)
Not more than 0.10%
0.08%
Assay
98.5 to101.0%
99.3%
pH
2.0 to 3.5
2.5
