tbzmedTabriz University of Medical SciencesPHARMResearch ArticleEssential Oil of Two Iranian Horehound Species: <em>Marrubium propinquum</em> and <em>Marrubium parviflorum</em>Chemical composition of two Iranian Horehound speciesHamedeyazdanSanaz, ZareiMasoomeh, SalemAyda, AsnaashariSolmaz, FathiazadFatemeh, 6201730620172327112016Tabriz University of Medical Sciences2016Essential Oil of Two Iranian Horehound Species: <em>Marrubium propinquum</em> and <em>Marrubium parviflorum</em>

<p>Background: Two species of genus <em>Marrubium</em> belonging to the family Lamiaceae, were studied for their volatile components. </p> <p>Methods: The essential oils were extracted from aerial parts of the plants through hydrodistillation using a Clevenger apparatus. Later, CG and CG-MS analysis were applied to assess the chemical components of the essential oils. </p> <p>Results: Analysis of the M. <em>propinquum</em> essential oil resulted in the identification of 22 components, representing 79.6% of the total essential oil that principally contained oleic acid (19%), &beta;-caryophyllene (7.4%) and m-tolualdehyde (5.2%). In the case of M. <em>parviflorum</em>, 20 components were identified, representing 83% of the M. <em>parviflorum</em> essential oil, among them oleic acid (11.8%), &alpha;-pinene (10.2%) and germacrene D (9.8%) were the main compounds. </p> <p>Conclusion: Regarding the results of this study in both essential oils after the non terpenoids, sesquiterpene hydrocarbons possessed the uppermost portion of the oils. We found some similarities and differences between M. <em>propinquum</em> and M. <em>parviflorum</em> essential oils and also in comparison with other species of genus <em>Marrubium</em> which might be due to different parameters such as agrotechnical factors.</p>