Analysis of terpenelactones in Ginkgo biloba by high performance liquid chromatography and evaporative light scattering detection

A reversed phase HPLC method permitting the determination of 5 terpenelacto nes in Ginkgo biloba, without the need of any sample preparation is present ed in this paper. The compounds were successfully separated within 25 min b y using a C-12 column, an evaporative light scattering (ELS) detector and a mobile phase comprising of ammonium acetate buffer, methanol and isobutano l. All terpenelactones were detectable at concentrations as low as 20.3 mug /ml. The analysis of G. biloba market products showed remarkable variations in the lactone content, and more than 2 fold differences in the suggested daily doses of the total lactones, from 8.84 mg to 18.28 mg, respectively.