en The Essential Oils of <i>Tanacetum pinnatum</i> Boiss. a Composite Herbs Growing Wild in Iran فارماكوگنوزی و فارماسيوتيكس Pharmacognosy & Pharmaceutics پژوهشی Research <div dir="ltr" style="text-align: justify;"><strong>Background:</strong> The genus Tanacetum (Compositae) is represented by 26 species in the flora of Iran, 12 of them are endemic. One report on the analysis of essential oil of <em>Tanacetum polycephalum</em> Boiss. species has been published. <strong>Objective:</strong> Aim of this study is to determine the chemical composition of the hydrodistilled oil of <em>Tanacetum pinnatum</em> Boiss. of Iranian origin for the first time. <strong>Methods: </strong>The essential oil of <em>T. pinnatum</em> obtained by hydrodistillation and analyzed by GC and GC/MS. <strong>Results:</strong> The major constituents appeared to be camphor (23.2%), &alpha;-pinene (8.5%) and camphene (7.7%). <strong>Conclusion:</strong> In <em>T. pinnatum</em> we identified 25 components representing 98.7%. It was rich in regard to monoterpene hydrocarbons (78.9%). The sesquiterpene fraction was relatively small, representing 19.8%.</div> <div dir="ltr" style="text-align: justify;"><strong>Background:</strong> The genus Tanacetum (Compositae) is represented by 26 species in the flora of Iran, 12 of them are endemic. One report on the analysis of essential oil of <em>Tanacetum polycephalum</em> Boiss. species has been published. <strong>Objective:</strong> Aim of this study is to determine the chemical composition of the hydrodistilled oil of <em>Tanacetum pinnatum</em> Boiss. of Iranian origin for the first time. <strong>Methods: </strong>The essential oil of <em>T. pinnatum</em> obtained by hydrodistillation and analyzed by GC and GC/MS. <strong>Results:</strong> The major constituents appeared to be camphor (23.2%), &alpha;-pinene (8.5%) and camphene (7.7%). <strong>Conclusion:</strong> In <em>T. pinnatum</em> we identified 25 components representing 98.7%. It was rich in regard to monoterpene hydrocarbons (78.9%). The sesquiterpene fraction was relatively small, representing 19.8%.</div> <,i>,Tanacetum pinnatum<,/i>,, Compositae, Essential oil, Camphor, α-pinene <,i>,Tanacetum pinnatum<,/i>,, Compositae, Essential oil, Camphor, α-pinene 44 49 http://jmp.ir/browse.php?a_code=A-10-236-1&slc_lang=en&sid=1 A Esmaeili A Esmaeili akbaresmaeili@yahoo.com 100319475328460038261 100319475328460038261 Yes Department of Chemical Engineering, North Tehran Branch, Islamic Azad University Department of Chemical Engineering, North Tehran Branch, Islamic Azad University H Amiri H Amiri 100319475328460038262 100319475328460038262 No Department of Biology, Lorestan University, Khoramabad Department of Biology, Lorestan University, Khoramabad Sh Rezazadeh Sh Rezazadeh 100319475328460038263 100319475328460038263 No Department of Pharmacognosy and Pharmaceutics, Institute of Medicinal Plants, ACECR Department of Pharmacognosy and Pharmaceutics, Institute of Medicinal Plants, ACECR