PH: 1.6-2.6
Clarity of solution Clarity: not more than 1#
Specific rotation +16°—+22°
Color of solution Color less than 7#(Y)
Water (KF): Not more than 3.5%
Related substances Individual impurity not more than 1.5％
Total impurity : not more than 4.0％
Sulphated: not more than 0.1%
Heavy metal: not more than 20ppm
Purity (HPLC): more than 98％
Assay (HPLC): as acid form more than 80%