Leishmaniasis is a painless chronic skin disease that is caused by the protozoan parasite Leishmania. Due to the importance of this disease and the side effects of chemical drugs, use of drugs of plant origin to treat Leishmaniasis is very important. In the present study, the chemical composition and the anti-Leishmania major activity of the essential oils obtained from Satureja bakhtiarica were evaluated in vitro. The oils were extracted using a Clevenger apparatus and then the chemical composition was analyzed by GC-MS. Promastigotes of L. major were cultured in both N.N.N and RPMI1640 media. GC-MS analysis showed 13 compounds, in which the major components were the phenolic (37.4%) compounds, thymol (22.6%) and p-cymene (19.3%). The essential oil of S. bakhtiarica showed higher activity against L. major than the standard anti-Leishmania drug, glucantime,. Perhaps because of the high concentration of phenolic compounds in the essential oil, all the parasites were killed after 24 hours. The essential oil from S. bakhtiarica is a potential plant drug against leishmaniasis. Further studies are necessary to evaluate this oil in animal models (in vivo) for future drug applications.
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