Determination of Iridoid Glycosides from Four Turkish Lamium Species by HPLC-ESI/MS

An HPLC-ESI/MS method that enables fast detection and identification of iridoid glycosides is described. Eleven iridoid glycosides known to occur in the genus Lamium-lamalbide, sesamoside, 6-β-OH ipolamiide, shanzhiside methyl ester, dehydropenstemoside, barlerin (= 8-O-acetylshanzhisidemethyl ester), 6-O-syringyl-8-O-acetylshanzhiside methyl ester, lamerioside, lamiide, eriobioside, andipolamiide, were identified by means of their retention time and ESI/MS data. This method wassuccessfully applied to the identification of the iridoid composition of the n-butanol extracts of Lamiumeriocephalum Bentham subsp. eriocephalum, L. garganicum L. subsp. pulchrum R. Mill, L. garganicumL. subsp. laevigatum Arcangeli, and L. purpureum L. var. purpureum from the Turkish flora.