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Antifeedant Activity

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Junya Mizutani – One of the best experts on this subject based on the ideXlab platform.

  • termite Antifeedant Activity in aframomum melegueta
    Phytochemistry, 1995
    Co-Authors: Pierre Escoubas, Labunmi Lajide, Junya Mizutani

    Abstract:

    Abstract n-Hexane and methanolic seed extracts of Aframomum melegueta were studied for termite Antifeedant Activity against workers of Reticulitermes speratus. Strong Antifeedant Activity was observed when the termite workers were tested in a choice filter paper disk bioassay containing 1% crude extracts. Bioassay-directed fractionation led to the isolation of gingerdione, 5-oxo-1-(4-hydroxy-3-methoxyphenyl)decan-3-one, [6]-paradol, 1-(4-hydroxy-3-methoxyphenyl)decan-3-one, [6]-gingerol, 5-hydroxy-1-(4-hydroxy-3-methoxyphenyl)decan-3-one and [6]-shogaol, 1-(4-hydroxy-3-methoxyphenyl)dec-5-en-3-one, as the Antifeedant compounds. [6]-Gingerol and [6]-shogaol exhibited the strongest Antifeedant Activity at 1000 ppm, corresponding to 8 μg cm−2.

  • Termite Antifeedant Activity in Xylopia aethiopica
    Phytochemistry, 1995
    Co-Authors: Labunmi Lajide, Pierre Escoubas, Junya Mizutani

    Abstract:

    Abstract A hexane extract of Xylopia aethiopica fruits and an aqueous methanol extract of the seeds were studied for termite Antifeedant Activity against workers of the subterranean termite, Reticulitermes speratus . The crude extract, at 1%, exhibited strong Antifeedant Activity in a choice filter paper disk bioassay. Bioassay-directed fractionation led to the isolation and identification of six ent-kaurane diterpenes in the hexane extract. Feeding deterrent Activity varied significantly with the structures when the compounds were tested at concentrations ranging from 5000 ppm (40 μg cm −2 ) to 100 ppm (0.824 μg cm −2 ). (−)-Kaur-16-en-19-oic acid had the strongest termite Antifeedants Activity among the ent-kauranes isolated. Two phenolic amides and four lignanamides were also isolated from the aqueous methanolic extract of seeds. E -3-(4-hydroxy-3-methoxyphenyl)- N -2-[4-Hydroxyphenylethyl]2-Propenamide was more active than E -3-(3,4-dihydroxyphenyl)- N -2-[4-Hydroxyphenylethyl]2-propenamide, whilst grossamide and the new lignanamide, demethylgrossamide, as well as (−)-cannabisins B and D exhibited potent feeding deterrent Activity at 5000 ppm. The identity of these compounds was established by spectroscopic analysis and synthesis. Two synthetic amides, E -3-(3,4-methylenedioxyphenyl)- N -2-[4-Hydroxyphenylethyl] propenamide and E -3-(3,4-methylenedioxyphenyl)- N -2-[octadecyl]-2-propenamide were also tested for Antifeedant Activity.

  • Termite Antifeedant Activity in Detarium microcarpum
    Phytochemistry, 1995
    Co-Authors: Labunmi Lajide, Pierre Escoubas, Junya Mizutani

    Abstract:

    A methanol extract of Detarium microcarpum leaves exhibited strong feeding deterrent Activity against workers of the subterranean termite, Reticulitermes speratus in a paper disk choice bioassay. Bioassay directed fractionation led to the isolation of four clerodane diterpenes, 3,13E-clerodien-15-oic acid, 4(18), 13E-clerodien-15-oic acid, 18-oxo-3,13E-clerodien-15-oic acid and 2-oxo-3,13E-clerodien-15-oic acid as the active compounds. With the exception of the latter, this is the first report of these compounds from D. microcarpum. The four compounds possessed strong Antifeedant Activity at 1% and their structures were confirmed by spectroscopic methods.

Labunmi Lajide – One of the best experts on this subject based on the ideXlab platform.

  • termite Antifeedant Activity in aframomum melegueta
    Phytochemistry, 1995
    Co-Authors: Pierre Escoubas, Labunmi Lajide, Junya Mizutani

    Abstract:

    Abstract n-Hexane and methanolic seed extracts of Aframomum melegueta were studied for termite Antifeedant Activity against workers of Reticulitermes speratus. Strong Antifeedant Activity was observed when the termite workers were tested in a choice filter paper disk bioassay containing 1% crude extracts. Bioassay-directed fractionation led to the isolation of gingerdione, 5-oxo-1-(4-hydroxy-3-methoxyphenyl)decan-3-one, [6]-paradol, 1-(4-hydroxy-3-methoxyphenyl)decan-3-one, [6]-gingerol, 5-hydroxy-1-(4-hydroxy-3-methoxyphenyl)decan-3-one and [6]-shogaol, 1-(4-hydroxy-3-methoxyphenyl)dec-5-en-3-one, as the Antifeedant compounds. [6]-Gingerol and [6]-shogaol exhibited the strongest Antifeedant Activity at 1000 ppm, corresponding to 8 μg cm−2.

  • Termite Antifeedant Activity in Xylopia aethiopica
    Phytochemistry, 1995
    Co-Authors: Labunmi Lajide, Pierre Escoubas, Junya Mizutani

    Abstract:

    Abstract A hexane extract of Xylopia aethiopica fruits and an aqueous methanol extract of the seeds were studied for termite Antifeedant Activity against workers of the subterranean termite, Reticulitermes speratus . The crude extract, at 1%, exhibited strong Antifeedant Activity in a choice filter paper disk bioassay. Bioassay-directed fractionation led to the isolation and identification of six ent-kaurane diterpenes in the hexane extract. Feeding deterrent Activity varied significantly with the structures when the compounds were tested at concentrations ranging from 5000 ppm (40 μg cm −2 ) to 100 ppm (0.824 μg cm −2 ). (−)-Kaur-16-en-19-oic acid had the strongest termite Antifeedants Activity among the ent-kauranes isolated. Two phenolic amides and four lignanamides were also isolated from the aqueous methanolic extract of seeds. E -3-(4-hydroxy-3-methoxyphenyl)- N -2-[4-Hydroxyphenylethyl]2-Propenamide was more active than E -3-(3,4-dihydroxyphenyl)- N -2-[4-Hydroxyphenylethyl]2-propenamide, whilst grossamide and the new lignanamide, demethylgrossamide, as well as (−)-cannabisins B and D exhibited potent feeding deterrent Activity at 5000 ppm. The identity of these compounds was established by spectroscopic analysis and synthesis. Two synthetic amides, E -3-(3,4-methylenedioxyphenyl)- N -2-[4-Hydroxyphenylethyl] propenamide and E -3-(3,4-methylenedioxyphenyl)- N -2-[octadecyl]-2-propenamide were also tested for Antifeedant Activity.

  • Termite Antifeedant Activity in Detarium microcarpum
    Phytochemistry, 1995
    Co-Authors: Labunmi Lajide, Pierre Escoubas, Junya Mizutani

    Abstract:

    A methanol extract of Detarium microcarpum leaves exhibited strong feeding deterrent Activity against workers of the subterranean termite, Reticulitermes speratus in a paper disk choice bioassay. Bioassay directed fractionation led to the isolation of four clerodane diterpenes, 3,13E-clerodien-15-oic acid, 4(18), 13E-clerodien-15-oic acid, 18-oxo-3,13E-clerodien-15-oic acid and 2-oxo-3,13E-clerodien-15-oic acid as the active compounds. With the exception of the latter, this is the first report of these compounds from D. microcarpum. The four compounds possessed strong Antifeedant Activity at 1% and their structures were confirmed by spectroscopic methods.

Pierre Escoubas – One of the best experts on this subject based on the ideXlab platform.

  • termite Antifeedant Activity in aframomum melegueta
    Phytochemistry, 1995
    Co-Authors: Pierre Escoubas, Labunmi Lajide, Junya Mizutani

    Abstract:

    Abstract n-Hexane and methanolic seed extracts of Aframomum melegueta were studied for termite Antifeedant Activity against workers of Reticulitermes speratus. Strong Antifeedant Activity was observed when the termite workers were tested in a choice filter paper disk bioassay containing 1% crude extracts. Bioassay-directed fractionation led to the isolation of gingerdione, 5-oxo-1-(4-hydroxy-3-methoxyphenyl)decan-3-one, [6]-paradol, 1-(4-hydroxy-3-methoxyphenyl)decan-3-one, [6]-gingerol, 5-hydroxy-1-(4-hydroxy-3-methoxyphenyl)decan-3-one and [6]-shogaol, 1-(4-hydroxy-3-methoxyphenyl)dec-5-en-3-one, as the Antifeedant compounds. [6]-Gingerol and [6]-shogaol exhibited the strongest Antifeedant Activity at 1000 ppm, corresponding to 8 μg cm−2.

  • Termite Antifeedant Activity in Xylopia aethiopica
    Phytochemistry, 1995
    Co-Authors: Labunmi Lajide, Pierre Escoubas, Junya Mizutani

    Abstract:

    Abstract A hexane extract of Xylopia aethiopica fruits and an aqueous methanol extract of the seeds were studied for termite Antifeedant Activity against workers of the subterranean termite, Reticulitermes speratus . The crude extract, at 1%, exhibited strong Antifeedant Activity in a choice filter paper disk bioassay. Bioassay-directed fractionation led to the isolation and identification of six ent-kaurane diterpenes in the hexane extract. Feeding deterrent Activity varied significantly with the structures when the compounds were tested at concentrations ranging from 5000 ppm (40 μg cm −2 ) to 100 ppm (0.824 μg cm −2 ). (−)-Kaur-16-en-19-oic acid had the strongest termite Antifeedants Activity among the ent-kauranes isolated. Two phenolic amides and four lignanamides were also isolated from the aqueous methanolic extract of seeds. E -3-(4-hydroxy-3-methoxyphenyl)- N -2-[4-Hydroxyphenylethyl]2-Propenamide was more active than E -3-(3,4-dihydroxyphenyl)- N -2-[4-Hydroxyphenylethyl]2-propenamide, whilst grossamide and the new lignanamide, demethylgrossamide, as well as (−)-cannabisins B and D exhibited potent feeding deterrent Activity at 5000 ppm. The identity of these compounds was established by spectroscopic analysis and synthesis. Two synthetic amides, E -3-(3,4-methylenedioxyphenyl)- N -2-[4-Hydroxyphenylethyl] propenamide and E -3-(3,4-methylenedioxyphenyl)- N -2-[octadecyl]-2-propenamide were also tested for Antifeedant Activity.

  • Termite Antifeedant Activity in Detarium microcarpum
    Phytochemistry, 1995
    Co-Authors: Labunmi Lajide, Pierre Escoubas, Junya Mizutani

    Abstract:

    A methanol extract of Detarium microcarpum leaves exhibited strong feeding deterrent Activity against workers of the subterranean termite, Reticulitermes speratus in a paper disk choice bioassay. Bioassay directed fractionation led to the isolation of four clerodane diterpenes, 3,13E-clerodien-15-oic acid, 4(18), 13E-clerodien-15-oic acid, 18-oxo-3,13E-clerodien-15-oic acid and 2-oxo-3,13E-clerodien-15-oic acid as the active compounds. With the exception of the latter, this is the first report of these compounds from D. microcarpum. The four compounds possessed strong Antifeedant Activity at 1% and their structures were confirmed by spectroscopic methods.