appearance white crystalline powder, odorles
assay 98.0~102.0%
water ≤3.0%
sulphated ash ≤0.1%
heavy metals ≤20ppm
specific rotation -42.0~-48.0º
solubility freely soluble in chloroform .soluble in ethanol,ethyl acetate and acetone.practically insoluble in water
identification a) uv:λmax233nm
b) ir :concordant with r.s
c) hplc: tr concordant with r.s
related substance single≤0.5%
total≤1.5%
residual organic solvents a) dichloromethane:0.06%max
b)hexane:0.029%max
c)acetone:0.5%max
d)ethyl acetate:0.5%max
e)methanol:0.3%max