References of "Fauconnier, Marie-Laure"
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See detailReview on the potential technologies for aromas recovery from food industry flue gas
Wylock, Christophe; Elloundou Mballa, Pierre Patrick; Heilporn, C. et al

in Trends in Food Science & Technology (2015), 46(1), 68-74

Background: Food-processing gaseous effluents are rich in flavoured volatile organic compounds (FVOCs). The discharge of these FVOCs is unwanted as they can contribute to the environmental olfactive ... [more ▼]

Background: Food-processing gaseous effluents are rich in flavoured volatile organic compounds (FVOCs). The discharge of these FVOCs is unwanted as they can contribute to the environmental olfactive pollution. Scope and approach: Their recovery would then enable their valuation through the strengthening of the organoleptic properties of the finished products or their use in other products, as well as reducing the pollution linked to their discharge. However, there are only a few documents in the literature concerning food aromas recovery from gaseous effluents. This paper reviews the used or potential technologies for the recovery of aromas from gaseous effluents in the food-processing industry. Key findings and conclusions: The technologies that are already applied in the food processing industry for aroma recovery from gaseous effluents are the vapour permeation and the condensation. The adsorption and the absorption are technologies used for scrubbing volatile organic compounds, which can be potentially used for gaseous aroma recovery. [less ▲]

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See detailChemical composition and antibacterial activitiy of the essential oils of Algerian Myrtus communis L.
Hennia, Aïcha; Brada, Moussa; Nemmiche, Saïd et al

in Journal of Essential Oil Research (2015)

Myrtus communis L. leaf essential oils from Algeria were analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). A total of thirty-four components were identified accounting ... [more ▼]

Myrtus communis L. leaf essential oils from Algeria were analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). A total of thirty-four components were identified accounting for 95% of the oil. The main compounds were limonene (23.4%), linalool (15.4%), geranyl acetate (10.9%), α-pinene (10.7%), linalyl acetate (8.2%) and 1,8-cineole (6.6%).The antimicrobial evaluation showed that myrtle oil exhibited good antibacterial activity against Staphylococcus aureus, Proteus mirabilis and Kleibsiella pneumonia, but differed according to the strains. Conversely, it was not active against Pseudomonas aeruginosa. [less ▲]

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See detailThe Chemical compositions and the Antioxidant and Antimicrobial Activities of the Essential Oil of Rosemary Leaves from Eastern Morocco
Tahri, Mustapha; Imelouane, Bouchra; Amhamdi, Hassan et al

in Journal of Materials and Environmental Science (2015), 6(3), 666-672

The essential oils compositions of Rosmarinus. tournefortii wild plant, Rosmarinus. tournefortii domesticated plant, and Rosmarinus officinalis.L wild plant growing in different bio climates from eastern ... [more ▼]

The essential oils compositions of Rosmarinus. tournefortii wild plant, Rosmarinus. tournefortii domesticated plant, and Rosmarinus officinalis.L wild plant growing in different bio climates from eastern Morocco, was determined by GC-FID and GC–MS. Oils were assessed for their antimicrobial and antioxidant activities. A variation of chemical compositions attributed to varieties rather than to bio climates was revealed. α-Pinene (0.637% ; 44.22% ; 5.74%), Camphene (11.62% ; 6.52% ; 2.21%), ß-Pinene (14.72% ; 1.14% ; 3.71%), 1,8-Cineole (10.1% ; not identifying ; 56.51%) and Camphor (39.27% ; 7.64% ; 13.56%) were identified as the main constituents of R. tournefortii wild plant, R. tournefortii domesticated plant, and R. officinalis. L wild plant respectively. This study is based on the determination of the diameter of inhibition to moderate antimicrobial and antioxidant activities of oils revealed to be against eight bacteria tested. This was determined by 1,1-diphenyl-1-picrylhydrazyl (DPPH) assay. The highest antimicrobial and antioxidant activities were found in oils from Rosmarinus. tournefortii domesticated plant. [less ▲]

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See detailRecherches de lignées aromatiques d’Abies par hybridation somatique
Fauconnier, Marie-Laure ULg; Druart, Philippe

Report (2015)

L’objectif du projet de recherche est d’associer les caractéristiques de croissance d’A. nordmanniana aux propriétés aromatiques d’autres espèces d’Abies en suivant la voie de la fusion somatique. Les ... [more ▼]

L’objectif du projet de recherche est d’associer les caractéristiques de croissance d’A. nordmanniana aux propriétés aromatiques d’autres espèces d’Abies en suivant la voie de la fusion somatique. Les travaux de recherche en culture "in vitro" sont menés au laboratoire de l’Unité de Génie biologique du Département "Science du Vivant" du CRAW (section 1) tandis que les analyses relatives à la détermination des profils aromatiques sont réalisées dans le laboratoire de l'Unité chimie générale et organique de l'Université de Liège-Gembloux Agro- Bio-Tech (section 2). Les deux Unités de recherche ont poursuivi leurs activités en parfaite collaboration. La première a tenté de restituer ou garder les propriétés embryogènes au travers de protoplastes provenant de lignées embryogènes d’A. nordmanniana, d’induire l’embryogenèse somatique sur des tissus d’embryons zygotiques d’autres Abies aromatiques et de réaliser des fusions somatiques en associant des protoplastes à des cellules de têtes d’embryons. La seconde s’occupait de caractériser les composés aromatiques, de suivre leur évolution selon période de végétation, de distinguer les espèces entre elles selon le profil aromatique de leurs graines tandis qu’en parallèle, elle mettait au point les techniques d’analyses en conditions aseptiques sur des lignées embryogènes d’A. nordmanniana d’origines génétiques différentes et sur les masses issues de fusions potentielles intra ou interspécifiques avec A. balsamea. [less ▲]

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See detailPhytochemical Study of Plants of Interest for Cosmetics in Mayotte
Saive, Matthew ULg; Fauconnier, Marie-Laure ULg; Danflous, Jean-Paul

Poster (2014, December 16)

This study takes place in a bigger project aiming to identify and to make an inventory of the French Pharmacopeia. Its aim is to identify plants or plant families regularly used in traditional cosmetics ... [more ▼]

This study takes place in a bigger project aiming to identify and to make an inventory of the French Pharmacopeia. Its aim is to identify plants or plant families regularly used in traditional cosmetics in Mayotte. In order to give a direction to the research, two technics where used. At first, the plants and their families used in the pharmacopeia of neighboring regions were inventoried using the literature. The resulting inventory was then compared with the flora of the Mahoran territory. The second technique was the realization of a semi-structured survey with people known for their plant-use knowledge in Mayotte. In order to have significant results, the ethnobotanical survey was done following Trotter & Logan’s protocol. (1986) According to that protocol, the gathered data has to be the following: common name, place of harvest, part used and the posology. Moreover the number of informant has to be big enough in order to integrate the data in several indicators such as: The informant agreement ration (IAR), the fidelity level (FL) and use value (UV). The number of informant was determined based on the population density of the different communes of the island. Another critical factor for this study is the correct identification of each sample. To achieve that when a sample was realized, it was taken twice. One for the analysis, the second sample was pressed and dried so as to enter a herbarium for identification. The last important step of this part of the study is the development of fast technics to establish the samples’ physiological activity. These test will give us qualitative information in order the isolate the plants that show a true potential. The targeted activities and tests being: - Anti-tyrosinase activity through an inhibition of tyrosinase test. - Anti-free-radicals activity through the DPPH test. - Anti-inflammatory activity through an inhibition of lipoxygenase an cyclooxygenase test The following steps of the study is the complete analysis of the physiologically active plants extracts in order to identify the active molecules. The end of the study will result in the creation of cosmetics originating from Mayotte’s flora. The way the cosmetics will be developed is thought so as it can be easily and durably done in Mayotte allowing this study to have a positive impact on the development of the island. [less ▲]

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See detailBelowground Chemical Ecology: The Case of Wireworms
Barsics, Fanny ULg; Delory, Benjamin ULg; Delaplace, Pierre ULg et al

Conference (2014, December 13)

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See detailEvaluation of the oxidative stability of blends of ‘Arbequina’ olive oils with other monovarietal olive oils
Mansouri, F.; Ben Moumen, A.; Houmy, N. et al

in Olivae (Official Journal of the International Olive Council) (2014), 120

Like elsewhere in the Mediterranean, the olive oil sector is one of the strategic branches of the Moroccan economy owing to its social and economic significance. This research entailed evaluation of the ... [more ▼]

Like elsewhere in the Mediterranean, the olive oil sector is one of the strategic branches of the Moroccan economy owing to its social and economic significance. This research entailed evaluation of the oxidative stability of olive oils made up of a blend of ‘Arbequina’ olive oil with ‘Arbosana’ and ‘Koroneiki’ monovarietal oils known for their high content of natural antioxidants (phenols and tocopherols) and their superior oxidative stability compared with ‘Arbequina’ oil. The monovarietal oils produced from the ‘Arbequina’, ‘Arbosana’ and ‘Koroneiki’ varieties, which have recently been introduced under intensive cultivation in the eastern region of Morocco, underwent physico–chemical characterisation to determine quality criteria, natural antioxidant content, fatty acid composition and triacylglycerol profile. The Rancimat test* was performed to assess the oxidative stability of these monovarietal oils and their three-variety blends. The oxidation tests were performed on five freshly prepared blends (A) of the three varieties – ‘Arbequina’/’Arbosana’/‘Koroneiki’ – according to the following volume ratios: A1: 60/30/10; A2: 60/20/20; A3: 60:10:30; A4: 50:25:25 and A5: 40:30:30. The test results show that blends A4 and A5 displayed the best oxidative stability, recording respective values of 72.67 h and 75.42 h. These results are comparable to those obtained for ‘Arbosana’ monovarietal oil (75.42 h), which is considered to be relatively stable. Hence, blending is an excellent tool for enhancing oils produced from varieties which, despite their excellent initial quality and their organoleptic attributes, are handicapped by their poor stability, as is the case of ‘Arbequina’ oil. [less ▲]

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See detailCaractérisation préliminaire de quelques variétés d’amande cultivées dans la région orientale du Maroc
Houmy, Nadia; Elmoudden, S.; Boujnah, M. et al

Poster (2014, November 21)

L’amande est un fruit sec riche en huile, protéines, glucides et vitamines. Il est consommé tel quel (séché, grillé) ou transformé sous d’autres formes tel que la pâte d’amande. L’huile d’amande est très ... [more ▼]

L’amande est un fruit sec riche en huile, protéines, glucides et vitamines. Il est consommé tel quel (séché, grillé) ou transformé sous d’autres formes tel que la pâte d’amande. L’huile d’amande est très utilisée en dermatologie pour ses propriétés cosmétiques, adoucissantes et hydratantes. Ce travail de recherche appliquée est mené en collaboration avec la DRA-oriental et la DPA d’Oujda. Il s’agit d’une contribution au développement la filière amandier dans la région qui porte sur la valorisation de l’amande et ces dérivées principalement l’huile et le tourteau d’amandes. Dans cette étude préliminaire les huiles et tourteaux de 5 variétés cultivées dans la région orientale (Marcona, Ferragnes-Ferraduel, Fournat et Beldi) ont été analysées. Les amandes ont été fournis par la coopérative Sidi Bouhria-Oujda et l’extraction mécanique d’huiles d’amandes des 5 principales variétés (Marcona, Ferragnes-Ferraduel, Fournat et Beldi), cultivées dans la région orientale a été réalisée par une presse à huile au niveau de la société PRODIGIA (Casablanca). Dans ce cas et selon la variété, les rendements en huile varient entre 46 et 60% MS. Le rendement en huiles par extraction chimique diffère de celui réalisé par presse mécanique. La différence est nette dans le cas de variété Marcona connue pour sa richesse en fibres. Les analyses chimique portent sur l’acidité des huiles d’amandes qui se situe entre 0,0197 et 0,0491%, Indice de Peroxyde se varie entre 6,43 et 16,4 (meq./kg) et la détermination des profils des acides gras (AG). A ce propos les profils d’acides gras des cinq variétés montrent trois AG majoritaires qui sont par ordre d’importance l’acide oléique (C18 :1), acide linoléique (C18 :2) et l’acide palmitique (C16) et dont les teneurs se situent respectivement entre 63,54-72,87% pour C18 :1, 17,84- 25,45% pour C18 :2 et 6,53 et 7,91% pour C16. La comparaison quantitative d’acides gras majoritaires montre une différence significative entre les variétés analysées. Le tourteau comme sous-produits de trituration mécanique contient toujours une quantité résiduelle d’huile, leurs teneurs en protéines totaux se situent entre 47 et 49 % MS et leurs teneurs en sucre totaux se situe entre 12,6 à 14%.MS. Il s’agit là d’un coproduits de trituration qui est également riche en fibres et qui mérite d’être valorisé par voie de technologie alimentaire. [less ▲]

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See detailAllelopathic and autotoxicity effects of barley (Hordeum vulgare L. ssp. vulgare) root exudates
Bouhaouel, Imen; Gfeller, Aurélie; Fauconnier, Marie-Laure ULg et al

in BioControl (2014), Online First

The allelopathic activity of barley (Hordeum vulgare L. ssp. vulgare) root exudates was studied by comparing their effects on seedling establishment in barley itself and in two weed species, Bromus ... [more ▼]

The allelopathic activity of barley (Hordeum vulgare L. ssp. vulgare) root exudates was studied by comparing their effects on seedling establishment in barley itself and in two weed species, Bromus diandrus Roth. and Lolium rigidum Gaudin, using an original laboratory protocol, named ‘seed-after-seed’. In this protocol, the donor and the receiver species of watersoluble allelochemicals are grown one after the other in the same dishes, in conditions reducing resource competition between both species. Growth of all receptive species (weeds and barley) was inhibited in a dose-dependent manner, when using increasing barley seed densities (0, 8, 19 and 25 seeds per Petri dish). In our conditions, the barley varieties and landraces exhibited different allelopathic activities against weeds or barley. The allelopathic potential of the barley root exudates was also dependent on the receiver species. Indeed, the released allelochemicals proved to be more toxic against the weed plants than on barley itself. Furthermore, the toxicity of the allelochemicals increased after their release by roots, between day 0 and day 6. These allelochemicals might contribute to the plant community dynamics and their usefulness as bio-herbicides deserves further consideration. [less ▲]

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See detailSurfactin interaction with model plant plasma membrane
Luzuriaga Loaiza, Walter ULg; Nasir, Mehmet Nail ULg; Lins, Laurence ULg et al

Poster (2014, October 20)

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See detailAnalysis of the interactions of natural elicitor rhamnolipids with plant plasma membranes by in silico methods
Polo Lozano, Damien ULg; Nasir, Mehmet Nail ULg; Deleu, Magali ULg et al

Poster (2014, October 20)

Rhamnolipids are surface active molecules produced mainly by various strains of the bacterium Pseudomonas aeruginosa. These secondary metabolites are composed of one to three fatty acids with various ... [more ▼]

Rhamnolipids are surface active molecules produced mainly by various strains of the bacterium Pseudomonas aeruginosa. These secondary metabolites are composed of one to three fatty acids with various chain lengths linked through a glycosidic bond to one or two rhamnose moieties. The fatty acids are linked together through an ester bond. These molecules have shown several biological activities including plant defense stimulation. It has be suggested that this elicitor activity could be related to an interaction of rhamnolipids with the lipid bilayer of the plant plasma membrane (PPM) and lead to its destabilization, which can activate the plant defense signaling pathways. In this context, interactions of two rhamnolipids (Rha-C10-C10 and Rha-Rha-C10-C10) with membrane models and lipidic constituents of the PPM were investigated using in silico approaches. Most probable chemical structures of the rhamnolipids were determined using the STRUCTURE TREE procedure according to the molecule potential energy. The ability of these rhamnolipid structures to insert within the PPM was assessed using IMPALA simulations. IMPALA uses a membrane model in which phospholipids molecules are implicitly modeled by an empirical function and the membrane properties are modeled by energetic restraints. The ability of each rhamnolipid structure to form an assembly with several PPM constituents (phospholipid (PLPC), sterols (Sitosterol, Stigmasterol, Campesterol) and sphingolipids (GIPC, Glucosylceramide)) was calculated using the HYPERMATRIX procedure, which calculate and minimize the energies of interaction between all molecules of the complex until the lowest energy structure is reached. [less ▲]

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See detailScreening of elicitor candidates on winter wheat against Septoria tritici
Le Mire, Géraldine ULg; Deleu, Magali ULg; Ongena, Marc ULg et al

Scientific conference (2014, October 14)

The various experiments to be held prior to elicitor screening are detailed, along with the screening metholodogy. Explanation is given on the increasing interests of plant elicitors, or "stimulators of ... [more ▼]

The various experiments to be held prior to elicitor screening are detailed, along with the screening metholodogy. Explanation is given on the increasing interests of plant elicitors, or "stimulators of natural defenses", for the sustainability of our agro-ecosystems. [less ▲]

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See detailElicitor screening to protect winter wheat against Septoria tritici Blotch: preliminary results
Le Mire, Géraldine ULg; Deleu, Magali ULg; Ongena, Marc ULg et al

Conference (2014, September)

Elicitors are plant immunity-triggering compounds which are currently considered as one of the most promising tools in agriculture for the induction of plant resistance to various diseases (Mejía-Teniente ... [more ▼]

Elicitors are plant immunity-triggering compounds which are currently considered as one of the most promising tools in agriculture for the induction of plant resistance to various diseases (Mejía-Teniente et al., 2010). By contributing to both economic and environmental performances of agroecosystems, they can help reducing the use of chemical inputs. Although some elicitor products are already available on the market, it appears that a variable efficiency in the field, along with an uneasy integration in the current legislation and agricultural strategies, make these tools difficult to use (Walters, Ratsep, & Havis, 2013). Besides these limitations, few elicitor treatments have yet been efficiently and specifically designed to protect crop plants such as wheat, which is grown and consumed worldwide, against major diseases threatening both their yield and quality. There is a strong need to better understand the mechanisms of induced resistance in plants and develop elicitor use in agriculture. A phD research is currently led in Gembloux Agro Bio-Tech to develop a method based on eliciting agents, tested in greenhouse and field conditions, to protect winter wheat against major diseases, namely Septoria tritici, Fusarium graminearum and Fusarium culmorum. This project focuses on the screening of a large number of elicitors from different origins and structures. In 2014, we focused the first screening experiments on the protection of wheat against Septoria tritici Blotch (STB). Two winter wheat genotypes were tested: susceptible ‘Avatar’ and semi-resistant ‘Sy Epson’. Plants at 3-leaf stage were first sprayed till runoff with different concentrations of elicitors, and then inoculated 5 days later with a Septoria tritici spore suspension (106 spores mL-1) using a hand sprayer. Control plants were treated, prior to disease inoculation, with sterile water (negative control) or with BION® (ASM, Syngenta Europe; positive control). The disease severity and incidence were scored every 2 days for 28 days post-inoculation (d.p.i) by measuring the percentage of area covered with lesions and bearing pycnidia on the third leaf. The first results of these tests should enable a first discrimination of elicitors considering their dose-efficiency to reduce disease severity. After further screening of all the elicitors in hand, a determination of the elicitation pathways of the most efficient molecules tested will be undertaken. We intend to study the influence of various factors (i.e Temperature, relative humidity, plant development stage) on the elicitation potential and develop a formulation to be finally tested under field conditions. [less ▲]

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See detailBatch enzymatic interesterification of fat blends using microwave
Danthine, Sabine ULg; Simon, C.; Richel, Aurore ULg et al

Poster (2014, September)

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See detailBarley (Hordeum distichon L.) roots produce volatile aldehydes via the lipoxygenase/hydroperoxide lyase pathway with a strong age-dependent pattern
Delory, Benjamin ULg; Delaplace, Pierre ULg; du Jardin, Patrick ULg et al

Conference (2014, August 13)

In chemical ecology, the roles played by root-emitted volatile organic compounds (VOCs) in biotic interactions and the quantitative analysis of such chemicals in root tissues remain poorly documented. In ... [more ▼]

In chemical ecology, the roles played by root-emitted volatile organic compounds (VOCs) in biotic interactions and the quantitative analysis of such chemicals in root tissues remain poorly documented. In this context, this study aims at using a fully automated gas chromatography – mass spectrometry methodology allowing both identification and accurate quantification of VOCs produced by roots of a monocotyledonous plant species at five selected developmental stages from germination to the end of tillering. Results show that barley roots mainly produce four volatile aldehydes, namely hexanal, (E)-hex-2-enal, (E)-non-2-enal and (E,Z)-nona-2,6-dienal. These molecules are well-known linoleic and linolenic acid derivatives produced via the lipoxygenase/hydroperoxide lyase pathway of higher plants. Our findings contrast with analyses documented on aboveground barley tissues that mainly emit C6 aldehydes, alcohols and their corresponding esters. Multivariate statistical analyses performed on individual VOC concentrations indicate quantitative changes in the volatile profile produced by barley roots according to plant age. Barley roots produced higher total and individual VOC concentrations when young seminal roots emerged from the coleorhizae compared to older phenological stages. Moreover, results also show that the C6/C9 volatile aldehyde ratio was the lowest at the end of tillering while the maximum mean value of this ratio was reached in seven day-old barley roots. [less ▲]

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See detailBelowground Chemical Ecology: The Case of Wireworms
Barsics, Fanny ULg; Delory, Benjamin ULg; Delaplace, Pierre ULg et al

Poster (2014, June)

Wireworms, clock-beetles' larvae (Coleoptera, Elateridae), are below ground pests of many crops. They cause dramatic yield losses worldwide. Research on their ecology is crucial to undertake innovative ... [more ▼]

Wireworms, clock-beetles' larvae (Coleoptera, Elateridae), are below ground pests of many crops. They cause dramatic yield losses worldwide. Research on their ecology is crucial to undertake innovative management strategies. In the field of chemical ecology, multitrophic interactions occurring in the rhizosphere are gaining increasing attention from entomologists and agronomists. Our research aims at unveiling the role of volatile organic compounds (VOC) involved in wireworms' foraging behavior, putatively leading to host localization and/or host recognition. [less ▲]

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