Essential oil composition and anti Acanthamoeba studies of Teucrium ramosissimum.

The aim of the present study was to evaluate the chemical composition of the essential oil obtained from the aerial parts of T. ramosissimum by hydrodistillation and to investigate their anti-Acanthamoeba activity. Identification and quantification were realized by gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame ionization detection by (GC-FID). Sixty-eight compounds representing 97.78% of the essential oil were identified, of which δ-cadinene (18.63%), δ-cadinol (18.70%), β-eudesmol (12.13%), γ-gurjunene (4.34%) and 8-cedrene (3.99%) were the main compounds. This essential oil contained a complex mixture consisting mainly on sesquiterpenes (80.62%) and monoterpene fractions (14.34%). The findings of the anti-Acanthamoeba assay indicate that T. ramosissimum essential oil have a good activity with an IC50  = 25.73 ± 0.75 μg/mL.