Chemical composition of essential oils of Marrubium vulgare L. and Marrubium incanum Desr. grown in Poland

Marrubium vulgare L. is a plant that is grown in Poland for medicinal purposes. Marrubium incanum Desr. grows primarily in plant collections in Polish botanical gardens. The present study compared the essential oil content in Marrubium vulgare L. and Marrubium incanum Desr. as well as the qualitative and quantitative composition of their essential oils. The essential oil content in the dried herb of Marrubium vulgare L. was 0.05%, while in the herb of Marrubium incanum Desr. it was 0.04%. This study showed the presence of 34 compounds in the oil of Marrubium vulgare L. and 20 compounds in the oil of Marrubium incanum Desr. The main components of the oil of Marrubium vulgare L. were as follows: E-caryophyllene (25.91-32.06%), germacrene D (20.23-31.14%) and delta-amorphene (8.38-10.22%), while in the oil of Marrubium incanum Desr. the following compounds were predominant: germacrene D (32.46-37.87%), E-caryophyllene (22.49-30.79%) and a-cadinol (14.36-17.87%).