... J. Paccalin, H. Dabadie, M. Bernard, F. Mendy, D. Spielmann and N. Delhaye, Intérêt d'un... more ... J. Paccalin, H. Dabadie, M. Bernard, F. Mendy, D. Spielmann and N. Delhaye, Intérêt d'une nouvelle plante oléagineuse: l'onagre (Oenothera biennis ou larmackiana), Apport en acide gamma-linolénique et troubles de la désaturation en pathologie, Médicine et Nutrition 21 ...
ABSTRACT Ni/Al2O3 and Ni/Al2O3–ZrO2 nanocatalysts synthesized via impregnation and treated with n... more ABSTRACT Ni/Al2O3 and Ni/Al2O3–ZrO2 nanocatalysts synthesized via impregnation and treated with non-thermal plasma were investigated in dry reforming of methane. The results showed that plasma treatment produces highly dispersed nanoparticles with a high surface area. Strong interaction between active phase and support particles in plasma-treated catalysts can be concluded based on XRD and XPS results. Smaller Ni particles with narrow particle size distribution were observed in plasma-treated Ni/Al2O3–ZrO2 nanocatalyst. The catalytic activity of plasma-treated Ni/Al2O3–ZrO2 was higher than that of conventional catalyst, resulting in operating conditions with considerably lower temperatures. Long reaction times confirmed the stability of the plasma-treated Ni/Al2O3–ZrO2 nanocatalyst.
In developing countries, traditional control methods are commonly used against stored-product ins... more In developing countries, traditional control methods are commonly used against stored-product insects and mites. In Senegal, the leaves of Cassia occidentalis L. (Caesalpiniaceae) are used to protect cowpea seeds (Vigna unguiculata L. (Walpers)) against Callosobruchus maculatus (Coleoptera: Bruchidae). The biological activity of the leaves, the seeds and oil of C. occidentalis was evaluated in controlled conditions (28 ± 2°C, 45 ± 5% r.h.) against C. maculatus. At the rate of 10% (w/w), both fresh and dry leaves as well as whole and ground seeds had no contact toxicity on the cowpea beetle. In contrast, seed oil induced an increase in mortality of C. maculatus eggs and first larval instar at the concentration of 10 ml/kg cowpea. The basis of the ovicidal and larvicidal activities are discussed in this paper. Several trials using pure compounds have highlighted that several fatty acids (linoleic, oleic and stearic) are responsible for C. occidentalis toxicity. C. occidentalis seed oil did not reduce the oviposition of C. maculatus at 10 ml/kg seed.
... leaves is that of 0vied0.~ The goal of Oviedo's study was to inves-tigate new so... more ... leaves is that of 0vied0.~ The goal of Oviedo's study was to inves-tigate new sources of natural colourants for the preparation of beverages. The extraction of R. alpinia seeds with n-hexane afforded a dark brown extract with pleasant odour. ... 3. G. Oviedo, Bol. SOC. Quim. ...
Essential oils of aromatic plants are nowadays cited as suitable tools for better protection of s... more Essential oils of aromatic plants are nowadays cited as suitable tools for better protection of stored grains from insect pest attacks. These chemical insecticides are less attractive to producers because of their low persistence and difficulty to use as pure product. There is therefore a need to formulate them as an easy handling chemical with better persistence. The present work aimed to study the formulation through adsorption of active components of Xylopia aethiopica Dunal (Annonaceae) essential oil on kaolin. X. aethiopica essential oil was obtained by hydrodistillation in a Clevenger type apparatus unit. Essential oil obtained was analysed by a GC–FID and a GC–MS. The adsorption measurements were performed with collected two kaolin fractions (F1 < 100 µm; F2 < 50 µm) and two kaolin fractions after H2O2 treatment (F3 < 50 µm; F4 < 2 µm). The kaolin was characterized by XRD, XRF, FTIR; its specific surface area was determined by the B.E.T method. The amount of essential oil adsorbed was inversely proportional to the particles size. Treatment of kaolin with hydrogen peroxide increased the adsorption capacity of essential oil components. The components adsorbed in highest amounts were sabinene, β-pinene, α-pinene and β-phellandrene.
... J. Paccalin, H. Dabadie, M. Bernard, F. Mendy, D. Spielmann and N. Delhaye, Intérêt d'un... more ... J. Paccalin, H. Dabadie, M. Bernard, F. Mendy, D. Spielmann and N. Delhaye, Intérêt d'une nouvelle plante oléagineuse: l'onagre (Oenothera biennis ou larmackiana), Apport en acide gamma-linolénique et troubles de la désaturation en pathologie, Médicine et Nutrition 21 ...
ABSTRACT Ni/Al2O3 and Ni/Al2O3–ZrO2 nanocatalysts synthesized via impregnation and treated with n... more ABSTRACT Ni/Al2O3 and Ni/Al2O3–ZrO2 nanocatalysts synthesized via impregnation and treated with non-thermal plasma were investigated in dry reforming of methane. The results showed that plasma treatment produces highly dispersed nanoparticles with a high surface area. Strong interaction between active phase and support particles in plasma-treated catalysts can be concluded based on XRD and XPS results. Smaller Ni particles with narrow particle size distribution were observed in plasma-treated Ni/Al2O3–ZrO2 nanocatalyst. The catalytic activity of plasma-treated Ni/Al2O3–ZrO2 was higher than that of conventional catalyst, resulting in operating conditions with considerably lower temperatures. Long reaction times confirmed the stability of the plasma-treated Ni/Al2O3–ZrO2 nanocatalyst.
In developing countries, traditional control methods are commonly used against stored-product ins... more In developing countries, traditional control methods are commonly used against stored-product insects and mites. In Senegal, the leaves of Cassia occidentalis L. (Caesalpiniaceae) are used to protect cowpea seeds (Vigna unguiculata L. (Walpers)) against Callosobruchus maculatus (Coleoptera: Bruchidae). The biological activity of the leaves, the seeds and oil of C. occidentalis was evaluated in controlled conditions (28 ± 2°C, 45 ± 5% r.h.) against C. maculatus. At the rate of 10% (w/w), both fresh and dry leaves as well as whole and ground seeds had no contact toxicity on the cowpea beetle. In contrast, seed oil induced an increase in mortality of C. maculatus eggs and first larval instar at the concentration of 10 ml/kg cowpea. The basis of the ovicidal and larvicidal activities are discussed in this paper. Several trials using pure compounds have highlighted that several fatty acids (linoleic, oleic and stearic) are responsible for C. occidentalis toxicity. C. occidentalis seed oil did not reduce the oviposition of C. maculatus at 10 ml/kg seed.
... leaves is that of 0vied0.~ The goal of Oviedo&amp;#x27;s study was to inves-tigate new so... more ... leaves is that of 0vied0.~ The goal of Oviedo&amp;#x27;s study was to inves-tigate new sources of natural colourants for the preparation of beverages. The extraction of R. alpinia seeds with n-hexane afforded a dark brown extract with pleasant odour. ... 3. G. Oviedo, Bol. SOC. Quim. ...
Essential oils of aromatic plants are nowadays cited as suitable tools for better protection of s... more Essential oils of aromatic plants are nowadays cited as suitable tools for better protection of stored grains from insect pest attacks. These chemical insecticides are less attractive to producers because of their low persistence and difficulty to use as pure product. There is therefore a need to formulate them as an easy handling chemical with better persistence. The present work aimed to study the formulation through adsorption of active components of Xylopia aethiopica Dunal (Annonaceae) essential oil on kaolin. X. aethiopica essential oil was obtained by hydrodistillation in a Clevenger type apparatus unit. Essential oil obtained was analysed by a GC–FID and a GC–MS. The adsorption measurements were performed with collected two kaolin fractions (F1 < 100 µm; F2 < 50 µm) and two kaolin fractions after H2O2 treatment (F3 < 50 µm; F4 < 2 µm). The kaolin was characterized by XRD, XRF, FTIR; its specific surface area was determined by the B.E.T method. The amount of essential oil adsorbed was inversely proportional to the particles size. Treatment of kaolin with hydrogen peroxide increased the adsorption capacity of essential oil components. The components adsorbed in highest amounts were sabinene, β-pinene, α-pinene and β-phellandrene.
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Papers by G. Lognay