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Abstract
The chemical composition of Johreniopsis stricticaulis essential oil was obtained by hydro-distillation method from its aerial parts, and analyzed by gas chromatography-mass spectrometry (GC/MS). Totally the current essential oil was mainly constituted of sesquiterpene hydrocarbons. Germacrene-B (23.0 %) was the most abundant compound, and the other major compounds were α-cubebene (10.02 %), γ-elemene (5.37 %) and limonene (4.72 %). Also antioxidant, antibacterial and antifungal activities of essential oil was tested. Antioxidant assay showed that the essential oil of J. stricticaulis has moderate activity, which was weaker than positive control butylated hydroxytoluene (BHT) (IC50 18.0 and 0. 13 mg/ml for essential oil and BHT, respectively). Moreover the essential oil of J. stricticaulis exhibited significant antibacterial and antifungal activities against Staphylococcus aureus as well as Candida albicans, respectively; however, it had no antibacterial effects on Escherichia coli. These results proved that essential oil of J. stricticaulis includes sesquiterpenes compounds with moderate antioxidant and antibacterial properties. This is the first report on chemical composition and biological activities of J. stricticaulis essential oil.