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Hervé Casabianca - One of the best experts on this subject based on the ideXlab platform.

  • the chemical composition and antibacterial activities of the essential oils from three aframomum species from cameroon and their potential as sources of e r nerolidol
    Natural Product Communications, 2013
    Co-Authors: Sylvie Kwanga Nguikwie, Maximilienne Nyegue, Florentine Ndoyefoe Belinga, Rosalie Annie Ngono Ngane, Bernard Romestand, Achraf Kouzayha, Paul Henri Amvam Zollo, Hervé Casabianca, Chantal Menut
    Abstract:

    Essential oils obtained by hydrodistillation of seeds, pericarps, leaves and rhizomes of Aframomum dalzielii, A. letestuianum and A. pruinosum grown in Cameroon were analyzed by GC-FID and GC-MS. The seed oils of the three species were characterized by a high content of (E)-(R)-nerolidol (>88.0 %), which was fully characterized by NMR spectroscopy and chiral GC analysis. The main constituents of the pericarp and rhizome oils were monoterpene hydrocarbons, mainly Beta-Pinene (0.8%-22.9%) and sabinene (29.0%-42.3%), along with 1,8-cineole (4.5%-23.7%); leaf oils were characterized by sesquiterpenes, namely (E)-beta-caryophyllene (18.4%-82.4%) and caryophyllene oxide (4.5%-23.7%). The antibacterial activities of these essential oils and of nine pure compounds (sabirtene, Beta-Pinene, 1,8-cineole, linalool, racemic (E)-nerolidol, (E)-(R)-nerolidol, (E)-beta-caryophyllene, a-humulene and caryophyllene oxide) were assessed against Micrococcus luteus and Escherichia coli. The strongest activities were observed against E. coli. The seed essential oils and their major component, (E)-(R)-nerolidol, exhibited the lowest MIC values (0.19-0.39 mu L/mL), justifying their traditional use and their potential application as natural food preservatives.

  • the chemical composition and antibacterial activities of the essential oils from three aframomum species from cameroon and their potential as sources of e r nerolidol
    Natural Product Communications, 2013
    Co-Authors: Sylvie Kwanga Nguikwie, Maximilienne Nyegue, Florentine Ndoyefoe Belinga, Rosalie Annie Ngono Ngane, Bernard Romestand, Achraf Kouzayha, Paul Henri Amvam Zollo, Hervé Casabianca, Chantal Menut
    Abstract:

    Essential oils obtained by hydrodistillation of seeds, pericarps, leaves and rhizomes of Aframomum dalzielii, A. letestuianum and A. pruinosum grown in Cameroon were analyzed by GC-FID and GC-MS. The seed oils of the three species were characterized by a high content of (E)-(R)-nerolidol (>88.0 %), which was fully characterized by NMR spectroscopy and chiral GC analysis. The main constituents of the pericarp and rhizome oils were monoterpene hydrocarbons, mainly Beta-Pinene (0.8%-22.9%) and sabinene (29.0%-42.3%), along with 1,8-cineole (4.5%-23.7%); leaf oils were characterized by sesquiterpenes, namely (E)-beta-caryophyllene (18.4%-82.4%) and caryophyllene oxide (4.5%-23.7%). The antibacterial activities of these essential oils and of nine pure compounds (sabirtene, Beta-Pinene, 1,8-cineole, linalool, racemic (E)-nerolidol, (E)-(R)-nerolidol, (E)-beta-caryophyllene, a-humulene and caryophyllene oxide) were assessed against Micrococcus luteus and Escherichia coli. The strongest activities were observed against E. coli. The seed essential oils and their major component, (E)-(R)-nerolidol, exhibited the lowest MIC values (0.19-0.39 mu L/mL), justifying their traditional use and their potential application as natural food preservatives.

  • Chemical differentiation of Boswellia sacra and Boswellia carterii essential oils by gas chromatography and chiral gas chromatography–mass spectrometry
    Journal of Chromatography A, 2012
    Co-Authors: Cole Woolley, Mahmoud M. Suhail, Brett L. Smith, Karen E. Boren, Lindsey C. Taylor, Marc Schreuder, Jeremiah K. Chai, Hervé Casabianca
    Abstract:

    Major botanical and scientific references currently identify two species of frankincense, Boswellia carterii and Boswellia sacra, as being synonymous. We evaluated the Somalian (B. carterii) and Omani/Yemeni (B. sacra) species by chemical analyses to determine if there were any minor or major differences between the two species of frankincense. Components identified with their average percent for B. sacra are alpha-thujene (0.6%), alpha-pinene (68.2%), camphene (2.1%), sabinene (2.9%), Beta-Pinene (2.0%), myrcene (0.7%), limonene+beta-phellandrene (6.2%). Components identified with their average percent for B. carterii are alpha-thujene (7.9%), alpha-pinene (37.3%), camphene (0.8%), sabinene (4.9%), Beta-Pinene (1.8%), myrcene (7.3%), limonene+beta-phellandrene (14.4%). Initially, GC-MS analysis did not reveal major statistical differences. However, optical rotation values, B. Sacra (+30.1 degrees ) and B. carterii (-13.3 degrees ), demonstrated a greater significant difference. Enantiomeric ratio (+)/(-) values of alpha-pinene for B. sacra and B. carterii are 8.24 and 0.68, respectively, were also calculated aiding our conclusion that B. sacra and B. carterii are not synonymous but rather two distinct and individual frankincense species.

Cole Woolley - One of the best experts on this subject based on the ideXlab platform.

  • Chemical differentiation of Boswellia sacra and Boswellia carterii essential oils by gas chromatography and chiral gas chromatography–mass spectrometry
    Journal of Chromatography A, 2012
    Co-Authors: Cole Woolley, Mahmoud M. Suhail, Brett L. Smith, Karen E. Boren, Lindsey C. Taylor, Marc Schreuder, Jeremiah K. Chai, Hervé Casabianca
    Abstract:

    Major botanical and scientific references currently identify two species of frankincense, Boswellia carterii and Boswellia sacra, as being synonymous. We evaluated the Somalian (B. carterii) and Omani/Yemeni (B. sacra) species by chemical analyses to determine if there were any minor or major differences between the two species of frankincense. Components identified with their average percent for B. sacra are alpha-thujene (0.6%), alpha-pinene (68.2%), camphene (2.1%), sabinene (2.9%), Beta-Pinene (2.0%), myrcene (0.7%), limonene+beta-phellandrene (6.2%). Components identified with their average percent for B. carterii are alpha-thujene (7.9%), alpha-pinene (37.3%), camphene (0.8%), sabinene (4.9%), Beta-Pinene (1.8%), myrcene (7.3%), limonene+beta-phellandrene (14.4%). Initially, GC-MS analysis did not reveal major statistical differences. However, optical rotation values, B. Sacra (+30.1 degrees ) and B. carterii (-13.3 degrees ), demonstrated a greater significant difference. Enantiomeric ratio (+)/(-) values of alpha-pinene for B. sacra and B. carterii are 8.24 and 0.68, respectively, were also calculated aiding our conclusion that B. sacra and B. carterii are not synonymous but rather two distinct and individual frankincense species.

Jalloul Bouajila - One of the best experts on this subject based on the ideXlab platform.

  • Chemical Composition and Anticancer and Antioxidant Activities of Schinus Molle L. and Schinus Terebinthifolius Raddi Berries Essential Oils
    Journal of Food Science, 2010
    Co-Authors: Houcine Bendaoud, Mehrez Romdhane, Sylvie Cazaux, Jean Pierre Souchard, Jalloul Bouajila
    Abstract:

    : Essential oils were obtained by steam distillation from berries of Schinus molle L. and Schinus terebinthifolius Raddi originating from southern of Tunisia and analyzed by GC-FID and GC-MS. Among 57 and 62 compounds (%[mg/100 g dry matter]) identified in these oils, the main were alpha-phellandrene (46.52%[1256.15] and 34.38%[859.60]), beta-phellandrene (20.81%[561.74] and 10.61%[265.15]), alpha-terpineol (8.38%[226.26] and 5.60%[140.03]), alpha-pinene (4.34%[117.29] and 6.49%[162.25]), Beta-Pinene (4.96%[133.81] and 3.09%[77.30]) and p-cymene (2.49%[67.28] and 7.34%[183.40]), respectively. A marked quantity of gamma-cadinene (18.04%[451.05]) was also identified in the S. terebinthifolius essential oil whereas only traces (0.07%[1.81]) were detected in the essential oil of S. molle. The in vitro antioxidant and antiradical scavenging properties of the investigated essential oils were evaluated by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-Azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) assays. Essential oil of S. terebinthifolius expressed stronger antioxidant activity in the ABTS assay, with an IC(50) of 24 +/- 0.8 mg/L, compared to S. molle (IC(50)= 257 +/- 10.3 mg/L). Essential oils were also evaluated for their anticancer activities against human breast cancer cells (MCF-7). S. terebinthifolius essential oil was more effective against tested cell lines (IC(50)= 47 +/- 9 mg/L) than that from S. molle (IC(50)= 54 +/- 10 mg/L). Suggestions on relationships between chemical composition and biological activities are outlined.

Annakarin Borgkarlson - One of the best experts on this subject based on the ideXlab platform.

  • tick repellent substances in the essential oil of tanacetum vulgare
    Journal of Medical Entomology, 2008
    Co-Authors: Katinka Palsson, Thomas G T Jaenson, Peter Baeckstrom, Annakarin Borgkarlson
    Abstract:

    The repellent effect of the essential oils of flower heads of the aromatic plant tansy, Tanacetum vulgare L. (Asteraceae), originating from Sweden, was tested against host-seeking nymphs of the common tick Ixodes ricinus (L.). The essential oils were obtained by steam distillation (SD) and by using an online solvent extraction separation setup. Further fractionations of the SD oils were obtained by medium-pressure liquid chromatography on silica gel. The volatiles of the essential oils and the fractions that exhibited strong tick repellency (90-100%) were collected by solid phase microextraction and identified by gas chromatography-mass spectrometry. The chemical analyses of the oils show that the populations of T. vulgare from Uppsala and Stockholm may represent different chemotypes, but that they exhibited similar tick repellency. Main volatiles detected from oils of T vulgare collected at Uppsala were a-pinene (27%), Beta-Pinene (11%), pinocamphone (11%), 1,3,3-trimethylcyclohex-l-ene-4-carboxaldehyde (11%), and 1,8-cineole (10%). In the sample collected in Stockholm, the main components were beta-thujone (39%) and camphor (23%) followed by a-thujone (11%) and 1,8-cineole (8%). When constituents in the oils, e.g., alpha-terpineol, 4-terpineol, alpha + beta-thujone, 1,8-cineol, verbenol, and verbenone, were tested separately (each diluted 0.5%, vol:vol), 64-72% tick repellency was obtained.

  • evaluation of extracts and oils of mosquito diptera culicidae repellent plants from sweden and guinea bissau
    Journal of Medical Entomology, 2006
    Co-Authors: Thomas G T Jaenson, Katinka Palsson, Annakarin Borgkarlson
    Abstract:

    In laboratory tests, ethyl acetate extracts of Hyptis suaveolens Poit. from Guinea-Bissau and Rhododendon tomentosum (Stokes) H. Harmaja (formerly Ledum palustre L.) and Myrica gale L. significantly reduced probing activity of Aedes aegypti (L.). In the field in southern Sweden, extracts of leaves of R. tomentosum, M. gale, and Achillea millefolium L. significantly reduced biting by Aedes mosquitoes. Volatile compounds from M. gale, R. tomentosum, A. millefolium, and H. suaveolens were collected by solid phase microextraction (SPME). Alternatively, compounds in the plants were subjected to extraction by organic solvents of different polarities or by steam distillation and collection by SPME. Compounds collected were identified by gas chromatography-mass spectrometry. Leaves of H. suaveolens contained mainly beta-caryophyllene, bergamotene, and terpinolene. The volatile fraction of an ethyl acetate extract of H. suaveolens was collected by SPME and included beta-caryophyllene, (-) -sabinene, Beta-Pinene, limonene, alpha-pinene, and bergamotene. The main volatiles detected were alpha-pinene, alpha-phellandrene, myrcene, and limonene from M. gale leaves or inflorescences; pcymene, sabinene, and terpinyl acetate from leaves of R. tomentosum; and (-)-germacrene D, Beta-Pinene, sabinene, and alpha-pinene from A. millefolium leaves or inflorescences. The selected plant species contained numerous volatiles known to have insecticidal, acaricidal, "pesticidal," and/ or insect repellent properties.

Youngjoon Ahn - One of the best experts on this subject based on the ideXlab platform.

  • toxicity of myristica fragrans seed compounds against blattella germanica dictyoptera blattellidae
    Journal of Medical Entomology, 2007
    Co-Authors: Woochul Jung, Youngsu Jang, Tran Trung Hieu, Chongkyu Lee, Youngjoon Ahn
    Abstract:

    The insecticidal constituents of hexane-soluble fraction from a methanolic extract of the seeds from Myristica fragrans (Myristicaceae) against adult females of Blattella germanica (L.) (Dictyoptera: Blattellidae) were analyzed by gas chromatography and gas chromatography-mass spectrometry. The insecticidal activity of 13 Myristica seed compounds against female B. germanica was examined by using the filter-paper contact toxicity and vapor phase toxicity bioassays. Results were compared with those of the other 23 known compounds of Myristica seed and currently used insecticides: dichlorvos, deltamethrin, permethrin, and propoxur. In contact toxicity tests using female B. germanica, (IS)-(-) -Beta-Pinene (0.06 mg/cm2) was the most toxic insecticide, based on 24-h LD50 values. The insecticidal activity of this compound was comparable with that of permethrin (0.05 mg/cm2). (1R)-(+) -Camphor, (1S)-(-) -camphor, dipentene, (1R)-(+) -3-pinene, and (+)-alpha-terpineol (0.10-0.14 mg/cm2) were more toxic than propoxur (0.19 mg/cm2). (E)-Sabinene hydrate and propoxur were almost equitoxic. Potent insecticidal activity also was observed with (R)-(+) -citronellal, (S)-(-) -citronellal, (R)-(-) -alpha-phellandrene, (1S)-(-) -alpha-pinene, (1R)-(+) -alpha-pinene, and safrole (0.27-0.48 mg/cm2). In vapor phase toxicity tests, the compounds tested were effective in closed but not in open containers. These results indicate that the effect of these compounds was largely a result of action in the vapor phase. Myristica seed compounds described merit further study as potential insecticides or as leads for the control of cockroaches.