|
Appearance
|
White powder
|
|
Assay (by HClO4 titration)
|
Min 99%
|
|
Specific optical rotation ([α]20/D)
|
+22.5 to + 24 deg
|
|
pH (2.5% solution)
|
5.5 - 6.5
|
|
Loss on drying (at 105°C)
|
Max 0.3%
|
|
Residue on ignition (as SO4)
|
Max 0.1%
|
|
Chloride (Cl)
|
Max 0.02%
|
|
Sulphate (SO4)
|
Max 0.03%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Ammonium (NH4)
|
Max 0.01%
|
|
Foreign amino acids
|
Max 0.3%
|
|
Other ninhydrin positive substances (as glycine)
|
Max 0.1%
|