Contribution to the quantitative and enantioselective determination of kavapyrones by high-performance liquid chromatography on ChiraSpher NT material

Journal of Chromatography. B, Biomedical Sciences and Applications
G BoonenHanns Häberlein

Abstract

A simultaneous HPLC separation of the enantiomers of kavain, dihydrokavain, methysticin and dihydromethysticin, as well as the achiral dienolides yangonin and desmethoxyyangonin was carried out on a ChiraSpher NT column. For quantitative determinations, calibration curves with correlation coefficients between 0.9982 and 0.9996 were established for the genuine kavapyrones. Detection limits between 0.25 microg and 0.5 microg per injection were measured at 240 nm. The defined scopes of work corresponded with the different kavapyrone amounts, depending on growth factors of distinct plant locations. The precision of the method was verified by analysing a phytopharmacon with a nominal value of 40 mg kavapyrones per tablet. The evaluation revealed 39.62 mg per tablet by the sum of single calculated kavapyrones. Relative standard deviations between 1.06% and 2.39% were found for the compounds under investigation. The accuracy of the method was proved by a recovery of 99.7%. To simplify the determination of the total kavapyrone amount, response factors and correlation factors for (+)-dihydrokavain, (+)-methysticin, (+)-dihydromethysticin, yangonin and desmethoxyyangonin were calculated relative to (+)-kavain.

Citations

Nov 24, 2004·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·Anna Rita BiliaFranco F Vincieri
Dec 14, 2004·Journal of Zhejiang University. Science. B·Chun-xiu PanXue-jun Zhang
Jun 20, 2008·Journal of Separation Science·Roberto CirilliFrancesco La Torre

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