Essential oil analysis of Teucrium libanitis and T. turredanum by GC and GC–MS

Abstract

The chemical composition of the six essential oils obtained from Teucrium libanitis and Teucrium turredanum collected at different localities was analysed by GC and GC-MS. Fifty-three constituents were identified. The oil of T. libanitis is characterized by the monoterpene α-pinene (9.9-21.2%) and the sesquiterpene δ-cadinene (5.3-9.7%), while that of T. turredanum had a higher content of sesquiterpenoids: β-caryophyllene (15.6-32.6%), α-humulene (4.7-10.1%) and β-bisabolol (6.4-8.3%), and a lower percentage of monoterpenoids (<1%). A multivariate procedure (hierarchical clustering) for detecting natural grouping established that T. libanitis and T. turredanum constitute two independent taxa.

Chemical Composition and Antimicrobial Activities of the Essential Oils ofTeucrium chamaedrys. subsp.chamaedrys.,T. orientale. var.puberulens., andT. chamaedrys. subsp.lydium.

“…orientale (Javidnia & Miri, 2003;Yildirim et al, 2004), T. chamaedrys (Morteza-Semnani et al, 2005), T. capitatum L. (Antunes et al, 2004), T. libanitis Schreb. and T. turredanum Losa and Rivas Goday (Blazquez et al, 2003), T. divaricatum Heldr. subsp.…”

“…The obtained crude essential oils were then investigated by GC-MS technique. Identification of the compounds was made by a typical library search (NIST, Wiley) and literature comparison (Blank, 1989;Adams, 1995;Tzakou et al, 1997;Rychlik, 1998;Skaltsa et al, 2000Skaltsa et al, , 2003Tkachev & Dobrotvorsky, 2000;Flamini et al, 2001Flamini et al, , 2002Blazquez et al, 2003;Ertugrul et al, 2003;Jovanovic et al, 2004.;Sefidkon et al, 2004;Figueredo et al, 2005;Javidnia et al, 2005).…”

Composition and antioxidant activity of the essential oil of Teucrium royleanum Wall. ex Benth growing in Pakistan

“…The essential oil content varies (0.5-1.5%) in different species growing in different parts of the world, and the percentage of the major chemical constituents (mainly monoterpene/ sesquiterpene hydrocarbons and oxygenated sesquiterpenes) invariably differ from species to species. 2,[11][12][13][14][15][16] This observation prompted us to investigate the chemical constituents of the essential oil obtained from T. royleanum, an indigenous species of north-western Pakistan.…”

Chemical composition of the essential oil of Teucrium hyrcanicum and T. chamaedrys L. SUBSP. chamaedrys from Iran

“…Also in the oils of T. oriental L. var. oriental, T. fruticans, T. abutiloides, T. salviastrum, T. turredanum, and T. betonicum, sesquiterpenoids such as β-caryophyllene, germacrene D, and α-humulene were reported to be the major components [8][9][10][11][12][13][14][15].…”

“…Also in the oils of T. oriental L. var. oriental, T. fruticans, T. abutiloides, T. salviastrum, T. turredanum, and T. betonicum, sesquiterpenoids such as β-caryophyllene, germacrene D, and α-humulene were reported to be the major components [8][9][10][11][12][13][14][15].In this paper the essential oil composition of Teucrium hyrcanicum, which is an endemic plant related to the Caspian sea area, is reported for the first time [16].Thirty-six components were identified in the oil of T. hyrcanicum representing 93.1% of the oil, and also forty-two components were characterized in the oil of T. chamaedrys ssp. chamaedrys representing 94.1% of the oil.…”