References of "Fauconnier, Marie-Laure"
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See detailMontmorillonite nanoclay based formulation for controlled and selective release of volatile essential oil compounds
Hammami, Abdourahim; Berraaouan, Doha; Fauconnier, Marie-Laure ULiege et al

in Materials Chemistry and Physics (in press)

In the current study, a green method that can be easily used in different industrial applications, based on the modification of sodium exchanged montmorillonite (Na ⁺ -Mt) with essential oils (EO) such as ... [more ▼]

In the current study, a green method that can be easily used in different industrial applications, based on the modification of sodium exchanged montmorillonite (Na ⁺ -Mt) with essential oils (EO) such as thyme oil, thymol and carvacrol was presented. The obtained results show the prepared clays-essential oils hybrids were promising nanomaterials to encapsulate the active compounds and to control their release selectively in the functional applications. X-ray diffraction (XRD) analysis was used to study the adsorption of EO, thymol and carvacrol molecules, in the interlayer space. To verify the adsorption of thyme EO, thymol and carvacrol into Na ⁺ -Mt layers and to determine the temperature range where the EO, thymol and carvacrol release took place, thermogravimetric analysis (TG) was used. Attenuated total reflecting-Fourier-transform infrared (ATR-FTIR) spectroscopy was used to verify and to study the adsorption mechanism. The obtained results show that the interlayer space of Na ⁺ -Mt was not affected by the adsorption of thyme EO, thymol or carvacrol molecules. The release of the adsorbed molecules of thyme EO, thymol or carvacrol from Na ⁺ -Mt surface was obtained above 180 °C. Combination of simulation with all obtained experimental results, confirm that the adsorption process of thyme EO, thymol, and carvacrol molecules on the Na ⁺ -Mt took place on the external surface i) by hydrogen bonds between the OH groups of thyme EO, thymol or carvacrol molecules and OH groups of Na ⁺ -Mt surface, and ii) by hydrogen bonds between these adsorbed molecules. The release study shows that the adsorption of EO like thyme, and its constituents such as thymol and carvacrol onto an inorganic porous material such as Na ⁺ -Mt provides extended controlled release of all adsorbed active molecules with their chemical stability due to the protection against environmental conditions. In addition, the release of thyme oil constituents (like thymol and carvacrol) occurs by a selective process in time. [less ▲]

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See detailAdvances and Perspectives in Fruits and Vegetables Flavor Based on Molecular Sensory Science
Gou, Min; Bi, Jinfeng; Chen, Qinqin et al

in Food Reviews International (2022)

Fruits and vegetables contain a large number of volatile compounds, which constitute their unique odor and contribute to their flavor. However, there are only a few key aroma compounds that contribute to ... [more ▼]

Fruits and vegetables contain a large number of volatile compounds, which constitute their unique odor and contribute to their flavor. However, there are only a few key aroma compounds that contribute to the special aroma. How to screen and identify key aroma compounds from many non-contributing and low-contributing compounds has always been the focus and difficulty of the research on the flavor quality of fruits and vegetables. However, it could be better solved via molecular sensory science technology. This review summarizes the application of molecular sensory science technology in fruits and vegetables flavor in recent years, and elaborates the analysis methods related to molecular sensory science, such as sensory evaluation, GC×GC-MS,GC-IMS, GC-O, OAV, omission test and recombination experiment. And some problems existing in current molecular sensory science technology are discussed and prospected. [less ▲]

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See detailEssential oils in agro-food industries: from traditional uses to new applications.
Fauconnier, Marie-Laure ULiege; Genva, Manon ULiege

Scientific conference (2021, December 21)

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See detailLes huiles essentielles
Fauconnier, Marie-Laure ULiege

Conference given outside the academic context (2021)

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See detailModulation of Plant Plasma Membrane Structure by Exogenous Fatty Acid Hydroperoxide is a Potential Perception Mechanism for their Eliciting Activity
Deboever, estelle ULiege; Vanaubel, Géraldine; Rondelli, Valeria et al

in Plant, Cell and Environment (2021)

Oxylipins are lipid-derived molecules that are ubiquitous in eukaryotes and whose functions in plant physiology have been widely reported. They appear to play a major role in plant immunity by ... [more ▼]

Oxylipins are lipid-derived molecules that are ubiquitous in eukaryotes and whose functions in plant physiology have been widely reported. They appear to play a major role in plant immunity by orchestrating reactive oxygen species (ROS) and hormone-dependent signalling pathways. The present work focuses on the specific case of fatty acid hydroperoxides (HPOs). Although some studies report their potential use as exogenous biocontrol agents for plant protection, evaluation of their efficiency in planta is lacking and no information is available about their mechanism of action. In this work, the potential of 13(S)-hydroperoxy-(9Z,11E)-octadecadienoic acid (13-HPOD) and 13(S)-hydroperoxy-(9Z,11E,15Z)-octadecatrienoic acid (13-HPOT), as plant defence elicitors and the underlying mechanism of action are investigated. Arabidopsis thaliana leaf resistance to Botrytis cinerea was observed after root application with HPOs. They also activate early immunity-related defence responses, like ROS. As previous studies have demonstrated their ability to interact with plant plasma membranes (PPM), we have further investigated the effects of HPOs on biomimetic PPM structure using complementary biophysics tools. Results show that HPO insertion into PPM impacts its global structure without solubilizing it. Relationship between biological assays and biophysical analysis suggests that lipid amphiphilic elicitors that directly act on membrane lipids might trigger early plant defence events. [less ▲]

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See detailAntioxydant activity, oxidative stability properties of Colza oil, comparison of mechanical agitated and ultrasonic extraction on green tea catechins of Camellia sinensis L.
Amrouche, Z; Blecker, Christophe ULiege; Laribi-Habchi, H et al

in Algerian journal of environmental science and technology (2021), 7(4), 2167-2176

Ultrasonic extraction “UE” used to optimize the extraction yield of phenolic compounds “PC” from green tea Camellia sinensis L., and compared with mechanical agitated extraction “MAE”. UE was applied at ... [more ▼]

Ultrasonic extraction “UE” used to optimize the extraction yield of phenolic compounds “PC” from green tea Camellia sinensis L., and compared with mechanical agitated extraction “MAE”. UE was applied at different times (15, 10 and 5min) and temperatures (25, 60 and 95°C) and MAE was performed at these experimental conditions (15 min, 95°C, 400 rpm). Results demonstrate that the maximum yield of epigallocatechin 3-gallate “EGCG” extracted by UE was significantly (P < 0.05) higher than that obteined using MAE (136 mg/g vs 100 mg/g, respectively). The optimum conditions for the polyphenol compounds “PC” recovery are obtained using UE during 15 min at 95°C (~134.66 mg/g). Four catechins from extracted PC were identified using high-performance liquid chromatography equipped with a diode array detector and liquid chromatography mass spectrometry “HPLC-DAD & LC-MS”: epigallocatechin “EGC”, epicatechin “EC”, epigallocatechingallate “EGCG”, and epicatechin-gallate “ECG”. EGCG is the major compound in polyphenol extracts representing 60 %. The antioxidant capacity of the obtained extracts was also studied. Diphényl-2-pycril-hydrazyl “DPPH” scavenging activity is higher for UE than MAE (~ 90 % vs ~85%). Moreover, the PC obtained by UE added to colza oil had a higher oxidative stability, determined by rancimat than those extracted by MAE method (~30.62 h vs ~21.26 h). Results indicate the suitability of UE method for production of PC as potent antioxidant for stabilization of vegetable oils such as colza oil. [less ▲]

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See detailStudy on Key Aroma Compounds and its Precursors of Peanut Oil Prepared with Normal- and High-Oleic Peanuts
Hui, Hu; Shi, Aimin; Liu, Hangzhin et al

in Foods (2021)

High-oleic acid peanut oil has developed rapidly in China in recent years due to its high oxidative stability and nutritional properties. However, the consumer feedback showed that the aroma of high-oleic ... [more ▼]

High-oleic acid peanut oil has developed rapidly in China in recent years due to its high oxidative stability and nutritional properties. However, the consumer feedback showed that the aroma of high-oleic peanut oil was not as good as the oil obtained from normal-oleic peanut variety. The aim of this study was to investigate the key volatile compounds and its precursors of peanut oil prepared with normal- and high-oleic peanuts. The peanut raw materials and oil processing samples used in the present study were collected from a company in China. Sensory evaluation results indicated that normal-oleic peanut oil showed stronger characteristic flavor than high-oleic peanut oil. Methylpyrazine, 2,5-dimethylpyrazine, 2-ethyl-5-methylpyrazine and benzaldehyde were considered as key volatiles which contribute to dark roast, roast peanutty and sweet aroma of peanut oil. The initial concentration of volatile precursors (arginine, tyrosine, lysine and glucose) in normal-oleic peanut was higher than high-oleic peanut, which lead to more characteristic volatiles forming during process, and provided stronger aroma of oil. The present research will provide data support for raw material screening and sensory quality improvement during high-oleic acid peanut oil industrial production. [less ▲]

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See detailComparison of fatty acid composition of milk from Holstein and local breed cows in two breeding systems
BENMALLEM REMANE, Yakout; Blecker, Christophe ULiege; Fauconnier, Marie-Laure ULiege et al

in Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Animal Science and Biotechnologies (2021), 78(2), 46-54

Milk production and quality are influenced by many factors, including nutrition, management practices and breed. The aim of this study was to determine the effect of farming management system and breed on ... [more ▼]

Milk production and quality are influenced by many factors, including nutrition, management practices and breed. The aim of this study was to determine the effect of farming management system and breed on the milk yield, and fatty acid composition of the milk from 50 confinement-fed cows that were fed a total mixed ration, and 52 pasture-fed cows grazed together in rangeland. Individual milk samples (N = 102) were collected once in February. Milk from local breed was characterized by a significantly lower milk yield, and somatic cell count, and a higher protein content than the Holstein breed. The fatty acid composition was relatively the same in both breeds. The result showed that farming management system has no significant effect on the milk yield, somatic cell count, and fat contents, while there was a significant effect on protein content and fatty acid composition. The milk of Holstein cows from extensive system was characterized by more favorable fat fractions with significantly lower concentrations of C10:0, C12:0, C14:0, the sum of short and medium chain saturated fatty acids and n-6: n-3 ratio, and also by higher concentration of unsaturated fatty acids and the sum of n-3 than the milk of Holstein from intensive system [less ▲]

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See detailLes huiles essentielles dans les thérapies contre le cancer
Genva, Manon ULiege; Fauconnier, Marie-Laure ULiege

Conference given outside the academic context (2021)

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See detailBio-specific Au/Fe3+ porous spongy nanoclusters for sensitive SERS detection of Escherichia coli O157:H7
Li, Yuzhi; Gao, Fei; Lu, Chang et al

in Biosensors (2021)

Abstract: For sensitive and fast detection of Escherichia coli O157:H7, organic and inorganic hybrid Au/Fe3+ nanoclusters (NCs) were synthesized for the first time using gold nanoparticles (GNPs), bovine ... [more ▼]

Abstract: For sensitive and fast detection of Escherichia coli O157:H7, organic and inorganic hybrid Au/Fe3+ nanoclusters (NCs) were synthesized for the first time using gold nanoparticles (GNPs), bovine serum albumin, ferric chloride, phosphate-buffered saline, and antibodies. The Au/Fe3+ porous spongy NCs with large surface area showed excellent bio-specific capability for E. coli O157:H7. GNPs in Au/Fe3+ NCs functioned as signal enhancers, significantly increasing the Raman signal via the metathesis reaction product of Prussian blue and obviously improving the detection sensitivity. We combined the novel Au/Fe3+ NCs with antibody-modified magnetic nanoparticles to create a biosensor capable of sensitive detection of E. coli O157:H7, which showed a good linear response (101 to 106 cfu/mL), high detection sensitivity (2 cfu/mL), and good recovery rate (93.60–97.50%) in spiked food samples. These results make the biosensor well-suited for food safety monitoring. This strategy achieves the goal of sensitive and quantitative detection of E. coli O157:H7. [less ▲]

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See detailToxic effects of a mixture of five pharmaceutical drugs assessed using Fontinalis antipyretica Hedw.
Sossey Alaoui, Khadija ULiege; Tychon, Bernard ULiege; Joaquim, Sandrine et al

in Ecotoxicology and Environmental Safety (2021)

The potential health risks associated with the pharmaceuticals released into the environment through effluents from sewage treatment plants have become a major cause for concern. Owing to the lack of ... [more ▼]

The potential health risks associated with the pharmaceuticals released into the environment through effluents from sewage treatment plants have become a major cause for concern. Owing to the lack of effective indicators, monitoring the concentration of these pollutants in the aquatic environment is challenging. The aim of this study was to assess the toxicity of a mixture of five pharmaceutical drugs (paracetamol, carbamazepine, diclofenac, irbesartan, and naproxen) using the aquatic moss Fontinalis antipyretica as a bioindicator and bioaccumulator. We examined the effects of the drug mixture on the cellular antioxidant system, chlorophyll content, and morphological traits of F. antipyretica. The plant was exposed for 5 months to three concentrations of the mixture, including the environmental concentration (MX1), and 10- (MX10) and 100-times (MX100) the environmental concentration. The results showed that only carbamazepine and irbesartan were accumulated by the species. The bioconcentration level increased with exposure time, with the maximum uptake at the 4th month of exposure. The increase in bioaccumulation with exposure time was more evident in plants exposed to MX100. Analysis of the activity of antioxidant enzymes showed that superoxide dismutase (SOD, EC 1.15.1.1.) and catalase (EC 1.11.1.6.) were highly sensitive to the drug mixture. The activity of the enzymes was significantly higher in plants exposed to MX100; however, the activity of guaiacol peroxidase (GPX, EC 1.11.1.7.) was not significantly affected. Plants exposed to MX10 and MX100 had significantly lower total chlorophyll content and chlorophyll a/b ratio compared with those of plants in the control group; however, photosynthetic activity was restored after 5 months of exposure. The morphological characteristics of F. antipyretica were less sensitive to the treatment conditions. [less ▲]

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See detailEssential oil-based bioherbicides: human health risks analysis
Maes, Chloé ULiege; Meersmans, Jeroen ULiege; Lins, Laurence ULiege et al

in International Journal of Molecular Sciences (2021)

: In recent years, the development of new bio‐based products for biocontrol has been gain‐ ing importance as it contributes to reducing the use of synthetic herbicides in agriculture. Conven‐ tional ... [more ▼]

: In recent years, the development of new bio‐based products for biocontrol has been gain‐ ing importance as it contributes to reducing the use of synthetic herbicides in agriculture. Conven‐ tional herbicides (i.e., the ones with synthetic molecules) can lead to adverse effects such as human diseases (cancers, neurodegenerative diseases, reproductive perturbations, etc.) but also to disturb‐ ing the environment because of their drift in the air, transport throughout aquatic systems and per‐ sistence across different environments. The use of natural molecules seems to be a very good alter‐ native for maintaining productive agriculture but without the negative side effects of synthetic herb‐ icides. In this context, essential oils and their components are increasingly studied in order to pro‐ duce several categories of biopesticides thanks to their well‐known biocidal activities. However, these molecules can also be potentially hazardous to humans and the environment. This article re‐ views the state of the literature and regulations with regard to the potential risks related to the use of essential oils as bioherbicides in agricultural and horticultural applications. [less ▲]

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See detailLes huiles essentielles : applications en agronomie
Fauconnier, Marie-Laure ULiege

Scientific conference (2021, August 24)

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See detailCharacterization by GC/MS-FID and GC/MS-HS-SPME and Insecticidal activity against Callosobruchus maculatus (Fabricius, 1775) of essential oils and powder of Xylopia aethiopica (Dunal) A. Rich from Senegal
Thiam, Abdoulaye; Talla Gueye, Momar; Sanghare, Cheikhna Hamala et al

in Journal of Plant Protection Research (2021), 61(3), 203-212

Today the use of plant extracts, in particular essential oils, is a natural alternative to synthetic insecticides in the fight against crop pests. In this study, the insecticidal activity of essential ... [more ▼]

Today the use of plant extracts, in particular essential oils, is a natural alternative to synthetic insecticides in the fight against crop pests. In this study, the insecticidal activity of essential oils and powder of Xylopia aethiopica (Annonaceae) were tested by both fumigation and contact against Callosobruchus maculatus. The essential oil of X. aethiopica, obtained by steam distillation and the powder, with a particle size of 1 mm, were used for the tests. The analysis of essential oils and powder of X. aethiopica by GC-MS / FID and GC/MS-HS-SPME, showed that the main compounds were β-pinene (28.9-19.0%), 1,8-cineole (14.9-7.6%) and α-pinene (9.8-19.4%). Insecticidal activity of essential oils and powder of X. aethiopica, respectively, by fumigation (F) and contact (C) against C. maculatus showed toxicity LD50 = 0.2±0.0 μL/cm3, LT50 = 16.4 ± 1.2 hours (F) and LD50 = 9.2 ± 0.7 g/kg, LT50 = 69.6 ± 0.4 hours (C). The essential oil and powder of X. aethiopica can be considered as bio-insecticides against C. maculatus for the protection of cowpeas in Senegal. [less ▲]

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See detailBoar taint detection - Development of sensors for rapid on line slaughterhouse detection of boar taint an approach based on the analysis of VOC profiles
Burgeon, Clément ULiege; Markey, Alice ULiege; Debliquy, Marc et al

Poster (2021, August)

Boar taint is a unpleasant smell found in the meat of some entire male pigs. Skatole and androstenone stored in fat are mainly responsible of this smell. They are emitted when the meat is cooked ... [more ▼]

Boar taint is a unpleasant smell found in the meat of some entire male pigs. Skatole and androstenone stored in fat are mainly responsible of this smell. They are emitted when the meat is cooked, releasing a urine and fecal like odor. Currently, detection of tainted carcasses is performed in slaughterhouses with the human nose or a colorimetric method. Fast, cheap and accurate VOCs sensor based methods are being developed to replace them.Elevated temperature VOC profiles are examined to -facilitate new sensor development , -gain the understanding of VOCs perceived during current boar taint sensory evaluations, -help in understanding which VOCs perceived by the consumers during the cooking of pork meat are lipid derived. [less ▲]

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See detailEffect of banana bunchy top virus on the interaction between banana aphids and banana trees
Murhuba Safari, Ignace; Tougeron, Kevin; Bragard, Claude et al

in Journal of Chemical Ecology (2021)

Banana plants are affected by various viral diseases, among which the most devastating is the "bunchy top", caused by the Banana bunchy top virus (BBTV) and transmitted by the aphid Pentalonia ... [more ▼]

Banana plants are affected by various viral diseases, among which the most devastating is the "bunchy top", caused by the Banana bunchy top virus (BBTV) and transmitted by the aphid Pentalonia nigronervosa Coquerel. The effect of BBTV on attraction mechanisms of dessert and plantain banana plants on the vector remains far from elucidated. For that, attractiveness tests were carried out using a two columns olfactometer for apterous aphids, and a flight cage experiment for alate aphids. Volatile Organic Compounds (VOCs) emitted by either healthy or BBTV-infected banana plants were identified using a dynamic extraction system and gas-chromatography mass-spectrometry (GC–MS) analysis. Behavioral results revealed a stronger attraction of aphids towards infected banana plants (independently from the variety), and towards the plantain variety (independently from the infection status). GC–MS results revealed that infected banana plants produced VOCs of the same mixture as healthy banana plants but in much higher quantities. In addition, VOCs produced by dessert and plantain banana plants were different in nature, and plantains produced higher quantities than dessert banana trees. This work opens interesting opportunities for biological control of P. nigronervosa, for example by luring away the aphid from banana plants through manipulation of olfactory cues. [less ▲]

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See detailInfluence of sodium alginate concentration on microcapsules properties foreseeing the protection and controlled release of bioactive substances
Essifi, Kamal; BERRAAOUN, Doha; Ed-Daoui, Aberrahim et al

in Journal of Chemistry (2021)

To understand the abilities of Ca-alginate microcapsules and their specific applications in different fields, it is necessary to determine the physicochemical and structural properties of those formulated ... [more ▼]

To understand the abilities of Ca-alginate microcapsules and their specific applications in different fields, it is necessary to determine the physicochemical and structural properties of those formulated microcapsules. In this work, we aimed to study the effect of alginate concentration in the improvement of the encapsulation efficiency (EE) and on the release of phenolic and flavonoid substances. *e relationship between the structure of the encapsulated bioactive substance and Ca-alginate network and their effect on the EE and release kinetics have been investigated. *e incorporation, structure, morphology, and phase properties of all elaborated materials were characterized by UV-spectroscopy, Fourier transform infrared (ATR-FTIR), scanning electron microscope (SEM), and X-ray diffraction (DRX). *e results indicate that increasing the polymer concentration increases the EE and decreases the loading capacity (LC), whereas the effect of alginate polymer concentration on the release was not observed. *e release study of bioactive substances showed that the release kinetics is relatively dependent on the structure and the physicochemical characteristics of the bioactive substance, which became clear when the encapsulated compounds were released from the core of calcium alginate microcapsules. *us, it could be concluded that the pores size of the Ca-alginate network is smaller than the volume of the crocin molecule (2794.926A˚ 3 ) and higher than the volume of the gallic acid molecule (527.659A˚ 3 ). For the same microcapsules system, the release mechanism is affected by the structure and physicochemical properties of the encapsulated molecules. [less ▲]

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