Item

Specification

Results

Appearance

White or almost white crystals,having almost no odor

white crystals,having almost no odor

Identification

1.Triturate sample with an equal amount of camphor; the mixture liquefles.

2.Dissolve a small sample in 1ml of glacial acetic acid, add 6 drops of sulfuric acid and 1 drop of nitric acid; a red-brown color develops.

3.To 1g sample add 5ml of a solution of sodium hydroxide(1→10) and heat on a water bath; a colorless or light yellow liquid is obtained. To this liquid add 2 to 3 drops of chloroform, while warm, and shake; a yellow-green color develops.

4.The sample solution exhibits a maximum absorbance at the wavelength at 279+2 nm.

Conforms

Melting point

110~113°C

110.7~111.2°C

Purity

1.Clarity of solution dissolve 3.0g sample in 10ml of ethanol; the solution is clear.

2.Orangic impurities:TLC

3.Heavy metals(Pb)≤20ppm

4.Arsenic≤2ppm

1.Conforms

2.Conforms

3.<20ppm

4<2ppm

Assay by HPLC

≥99.5%

99.9%