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Determination of Pyrogallol Acid in Tannic Acid Extracted from Chinese Gallnut by High Performance Liquid Chromatography

CHENG Chun-xi,GENG Qin(Hubei Research Institute of Chemistry,Wuhan 430074,China)  
There are some pyrogallol acid in the tannic acid distilled from gallnut.The pyrogallol acid and other compositions can be well separated by HPLC on a Luna C_18 column with acetonitrile-tetrahydrofuran-water as mobile phase under the condition of pH=3.And the content of pyrogallol acid can be simply and successfully determined.This method has been applied in the industrial analysis.
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