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Jemia M.B.,Laboratoire des Plantes Extremophiles Biotechnologic Center Borj Cedria Technopark | Chaabane S.,Laboratoire des Plantes Extremophiles Biotechnologic Center Borj Cedria Technopark | Senatore F.,University of Naples Federico II | Bruno M.,University of Palermo | Kchouk M.E.,Laboratoire des Plantes Extremophiles Biotechnologic Center Borj Cedria Technopark
Natural Product Research | Year: 2013

This study analyses the chemical composition and in vitro antioxidant activity of both the essential oil and the 80% aqueous acetone extract of Tetraclinis articulata leaves. The GC-MS analysis of the essential oil identified 66 components that comprise 93.5% of the oil. The major constituents of the oil are: bornyl acetate (31.4%), -pinene (24.5%) and camphor (20.3%). Antioxidant activities of the samples were determined using four different test systems, namely DPPH, -carotene/linoleic acid, reducing power and metal chelating activity assay. Test results from the DPPH system showed the strongest radical scavenging activity was exhibited by the 80% aqueous acetone extract (IC50 5.5 mgmL-1), which was two times higher than the positive control (BHT). The amount of the total phenolics, flavonoids and condensed tannins was very high in the 80% aqueous acetone extracts. The correlation between the antioxidant activity potential and total phenolic level of the extract was noted. © 2013 Taylor & Francis. Source


Jemia M.B.,Laboratoire des Plantes Extremophiles Biotechnologic Center Borj Cedria Technopark | Formisano C.,University of Naples Federico II | Bancheva S.,Bulgarian Academy of Science | Bruno M.,University of Palermo | Senatore F.,University of Naples Federico II
Natural Product Communications | Year: 2012

The volatile constituents of the aerial parts of Centaurea formanekii Halacsy and the aerial parts, capitula and roots of C. orphanidea Heldr. & Sart. ex Boiss. ssp. thessala (Hausskn.) Dostál from Greece were extracted by hydrodistillation and analyzed. The main components in C. formanekii were hexadecanoic acid (13.6%), δ-elemene (9.1%), and spathulenol (6.9%). The main components in C. orphanidea ssp. thessala were γ-elemene (26.1%) and caryophyllene oxide (13.2%) in the aerial parts, hexadecanoic acid (33.5%) and heptacosane (6.3%) in the capitula, and hexadecanoic acid methyl ester (22.0%) and α-chamigrene (14.0%) in the roots. The chemotaxonomic significance with respect to other previously studied species of the same sections (Phalolepis and Achrolopus, respectively) is discussed. Source


Khaoukha G.,University Of Msila | Ben Jemia M.,Laboratoire des Plantes Extremophiles Biotechnologic Center Borj Cedria Technopark | Amira S.,Ferhat Abbas University Setif | Laouer H.,Ferhat Abbas University Setif | And 3 more authors.
Natural Product Research | Year: 2014

The essential oils of the flowers of Magydaris tomentosa (Desf.) DC. (Apiaceae) collected in Sicily (MSi) and Algeria (MAl), respectively, were obtained by hydrodistillation, and their compositions were analysed. The analyses allowed the identification and quantification of 23 components in MSi and 60 compounds in MAl, respectively, showing a very different profile in the composition of the two populations. The main components of MSi were cembrene (28.2%), -springene (17.5%) and β-springene (14.8%), also present in MAl but in lesser amount (0.4%, 1.8% and 0.9%, respectively), whereas the principal constituents of MAl were (E)-nerolidol (35.4%), -costol (13.3%) and β-costol (6.8%). Both MSi and MAl exhibited a significant antibacterial activity against Staphylococcus epidermidis (minimum inhibitory concentration = 25 and 12.5 μ/mL, respectively). The chemotaxonomy markers of the species were identified. © 2014 © 2014 Taylor & Francis. Source

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