Antimicrobial activity and chemical composition of the essential oil from Campanula glomerata L. subsp. hispida (Witasek) Hayek

The volatile components of the essential oil from Campanula glomerata L. subsp. hispida (Witasek) Hayek was analyzed by GC and GCMS. Forty-eight compounds representing 89.0 % of the total oil were characterized and the main constituents of this specie were found to be hexadecanoic acid (24.51 %), docosane (15.9 %), isocitronellene (12.6 %), heneicosane (4.6 %), hexahydrofarnesyl acetone (3.2 %), ?-tricosene (1.6 %), octadecanol (1.4 %), caryophyllene oxide (1.3 %), ?-funebrene (1.2 %), ?-thujaplicinol (1.1 %), pentadecanoic acid (1.1 %), tricosane (1.1 %), (2E,4E)-decadienal (1.0 %), (E)-?-damascenone (1.0 %) and (E)-caryophyllene (1.0 %). The antimicrobial activity of the isolated essential oil of the plant was also investigated and it showed moderate antimicrobial and antifungal activities against Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, Bacillus cereus, Mycobacterium smegmatis, Candida albicans and Saccharomyces cerevisiae

Antimicrobial activity and a comparative essential oil analysis of Centaurea pulcherrima Willd. var. pulcherrima extracted by hydrodistillation and microwave distillation

PubMed: 21902569The essential oils of Centaurea pulcherrima Willd. var. pulcherrima (Asteraceae) were isolated by hydrodistillation (HD) and a microwave distillation (MD), than characterised by GC-FID and GC-MS. A total of 58 and 57 compounds were identified, constituting over 93.7%, and 91.6% of volatile oil composition of C. pulcherrima var. pulcherrima, respectively. Sesquiterpene hydrocarbons were shown to be the main group of constituents (HD: 42.4% versus MD: 51.5%). The major component of the oils of C. pulcherrima var. pulcherrima was germacrene D (HD, 17.8% versus MD, 23.2%). The antimicrobial activity of the isolated essential oils of the plant was also investigated, and they showed good antibacterial activity against to tested Gram-positive bacteria, especially to M. smegmatis and a yeast-like fungus C. albicans. © 2011 Taylor & Francis.This work was supported by grants from Karadeniz Technical University Research Fund and State Planning Agency (DPT) of Turkey. We thank to Prof S. Terziog? lu for identification of the plant

Antimicrobial activity and volatile constituents of omphalodes cappadocica (Willd.) DC.

The composition of the essential oil isolated by hydrodistillation from Omphalodes cappadocica (Willd.) DC. (Boraginaceae) collected from 'Of', a town in Trabzon, was determined by GC-FID and GC-MS. Sixty components were identified corresponding 90.8 % of the oil. The major components were benzaldehyde (18.1 %), nonanal (10.0 %), 2E-nonenal (8.1 %), tricosane (4.4 %), octanal (3.9 %), 2- pentyl furan (3.8 %), 2E,6Z-nonadienal (3.7 %) and 2E,4E-decadienal (2.7 %). In addition, antimicrobial activity of the essential oil of O. cappadocica was investigated against Escherichia coli, Yersinia pseudotuberculosis, Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, Listeria monocytogenes, Bacillus cereus, Mycobacterium smegmatis and Candida albicans and Saccharomyces cerevisiae at maximum essential oil concentration in hexane of 1000 ?g/mL. They showed only antibacterial activity against bacteria E. coli, S. aureus, B. cereus, M. smegmatis and the fungicidal activity against C. albicans and S. cerevisiae

Chemical composition and antimicrobial activity of the essential oils from the aerial parts of Astragalus hamzaoglui extracted by hydrodistillation and microwave distillation

The essential oils from the areal parts (flower, leaf and stem) of Astragalus hamzaoglui were isolated by hydrodistillation (HD) and a microwave distillation (MD) process. The composition of the volatiles was analysed by GC-FID and GC-MS and screened for their in vitro antimicrobial activity. Totals of 68/64, 65/64, and 68/67 compounds were identified in the flower, leaf, and stem oils of A. hamzaoglui accounting for 92.9- 95.0% in HD and 87.4-90.7% in MD, respectively. The essential oils consisted mainly of oxygenated monoterpenes (flower, HD: 33.3% vs. MD: 2.3%, leaf, HD: 8.0% vs. MD: 2.7%, stem, HD: 10.8% vs. MD: 4.7%), alcohols (flower, HD: 13.6% vs. MD: 10.4%, leaf, HD: 51.6% vs. MD: 3.6%, stem, HD: 35.4% vs. MD: 7.6%) and aldehydes (flower, HD: 15.5% vs. MD: 27.9%, leaf, HD: 10.0% vs. MD: 14.8%, stem, HD: 17.2% vs. MD: 24.5%). The major component of the oils of A. hamzaoglui was 1-octene-3-ol (flower, HD: 11.3% vs. MD: 8.8%, leaf, HD: 45.50% vs. MD: 3.3%, stem, HD: 32.6% vs. MD: 6.9%). Oxygenated sesquiterpenes were the minor constituents in all parts (flower, HD: 0.8% vs. MD: 0.4%, leaf, HD: 0.2% vs. MD: 0.4%, stem, HD: 0.4% vs. MD: 0.4%). of the A. hamzaoglui. Comparative study showed that the amount of total volatiles (flower, 95.0%, leaf, 92.9%, and stem, 95.0%) and the major constituent for the low molecular weight of essential oils were found to be better in HD of A. hamzaoglui. The oils were screened for antimicrobial activity against 12 microorganisms and showed antibacterial and antifungal activities against Escherichia coli, Staphylococcus aureus, Bacillus cereus 702 Roma, Mycobacterium smegmatis, and Saccharomyces cerevisiae. The antifungal activity was observed for the all tested oils against S. cerevisiae except stem oil of HD