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  1. IPB Halle
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    • Trenner 0
    • Molecular Signal Processing
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  • 1

Publications

Ali, N. A. A.; Crouch, R. A.; Al-Fatimi, M. A.; Arnold, N.; Teichert, A.; Setzer, W. N.; Wessjohann, L.; Chemical Composition, Antimicrobial, Antiradical and Anticholinesterase activity of the Essential Oil of Pulicaria stephanocarpa from Soqotra Nat. Prod. Commun. 7 113-116 (2012) DOI: 10.1177/1934578X1200700137
  • Abstract
  • BibText
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The chemical composition of the hydrodistilled leaf essential oil from Pulicaria stephanocarpa Balf Fil was determined by GC-MS analysis, and its antimicrobial, antioxidant and anticholinesterase (AChE) activities were evaluated. Eighty-three compounds were identified representing 97.2% of the total oil. (E)-Caryophyllene 13.4%, (E)-nerolidol 8.5%, caryophyllene oxide 8.5%, α-cadinol 8.2% spathulenol 6.8% and τ-cadinol 4.7%, were the main components. Antimicrobial activity of the oil, evaluated using the disc diffusion and broth dilution methods, demonstrated the highest susceptibility on Gram-positive bacteria and Candida albicans. The free radical scavenging ability of the oil was assessed by the DPPH assay to show antiradical activity with IC50 of 330 μg/mL. Moreover, the oil revealed an AChE inhibitory activity of 47% at a concentration of 200 μg/mL using Ellman's method.

Publications

Ali, N. A. A.; Wurster, M.; Denkert, A.; Arnold, N.; Fadail, I.; Al-Didamony, G.; Lindequist, U.; Wessjohann, L.; Setzer, W. N.; Chemical Composition, Antimicrobial, Antioxidant and Cytotoxic Activity of Essential Oils of Plectranthus cylindraceus and Meriandra benghalensis from Yemen Nat. Prod. Commun. 7 1099-1102 (2012) DOI: 10.1177/1934578X1200700834
  • Abstract
  • BibText
  • RIS

The chemical composition, antimicrobial, antioxidant and cytotoxic activities of the essential oils isolated from the leaves of Plectranthus cylindraceus Hoechst. ex. Benth. (EOPC) and Meriandra benghalensis (Roxb.) Benth. (EOMB) were investigated. Sixteen compounds were identified in P. cylindraceus oil representing 94.5% of the oil content with thymol (68.5%), terpinolene (5.3%), β-selinene (4.7%), β-caryophyllene (4.0%), δ-cadinol (2.1%), and ar-curcumene (1.7%) as the major compounds. In M. benghalensis oil, 12 compounds were identified, which made up 82.0% of the total oil. The most abundant constituents were camphor (43.6%), 1,8-cineole (10.7%), α-eudesmol (5.8%), caryophyllene oxide (5.8%), camphene (5.3%) and borneol (3.4%). The antimicrobial activities of both oils were evaluated against five microorganisms with the disc diffusion test, the broth micro-dilution method and a semiquantitative bioautographic test. The most sensitive microorganisms for P. cylindraceus oil were S. aureus, B. subtilis, and C. albicans with inhibition zones of 38, 42, and 43 mm and MIC values of 0.39, 0.18, and, 0.18 μL/mL, respectively. M. benghalensis oil showed weak to moderate activity against the tested microorganisms. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assay was employed to study the potential antioxidant activities of both oils. The antioxidant activity of P. cylindraceus oil (IC50 34.5 μg/mL) appeared to be higher than that of M. benghalensis oil (IC50 935 μg/mL). At a concentration of 100 μg/mL, EOMB showed a stronger cytotoxic activity, with growth inhibition of 71% against HT29 tumor cells, than EOPC (18%).

Publications

Ali, N. A. A.; Sharopov, F. S.; Alhaj, M.; Hill, G. M.; Porzel, A.; Arnold, N.; Setzer, W. N.; Schmidt, J.; Wessjohann, L.; Chemical Composition and Biological Activity of Essential Oil from Pulicaria undulata from Yemen Nat. Prod. Commun. 7 257-260 (2012) DOI: 10.1177/1934578X1200700238
  • Abstract
  • BibText
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The chemical composition of the essential oil obtained from the leaves of Pulicaria undulata Gamal Ed Din (syn P. oriental sensu Schwartz and P. jaubertii Gamal Ed Din) was analyzed by GC-MS. Major compounds of P. undulata oil were the oxygenated monoterpenenes, carvotanacetone (91.4%) and 2,5-dimethoxy-p-cymene (2.6.%). The antimicrobial activity of the essential oil was evaluated against six microorganisms, Escherichia coli Pseudomonas aeruginosa, Staphylococcus aureus, methicillin-resistant S. aureus, Bacillus subtilis, and Candida albicans, using disc diffusion and broth microdilution methods. The oil showed the strongest bactericidal activity against Staphylococcus aureus and methicillin-resistant S. aureus, as well as Candida albicans. The essential oil showed moderate cytotoxic activity against MCF-7 breast tumor cells, with an IC50 of 64.6 ±13.7 μg/mL. Bioautographic assays were used to evaluate the acetylcholinesterase inhibitory effect as well as antifungal activity of the oil against Cladosporium cucumerinum.

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