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See detailDéveloppement d'un modèle mathématique d'identification des différents tissus externes de son de blé dur et tendre (Triticum durum et Triticum aestivum) basé sur l'étude histologique macroscopique et microscopique et la composition biochimique des fractions
Ben Amouda, Mohamed Salah; Roiseux, Olivier; Olive, Gilles et al

Poster (2015, March 15)

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Le blé sert depuis longtemps de nourriture de base à l’homme pour donner, après mouture, à la farine dans le cas des blés ... [more ▼]

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Le blé sert depuis longtemps de nourriture de base à l’homme pour donner, après mouture, à la farine dans le cas des blés tendres, ou à la semoule dans le cas des blés durs. Le produit obtenu correspond à la majorité de l’albumen. Le son de blé est quant à lui un coproduit de cette transformation. C’est un empilement de différents tissus : péricarpe externe et interne, testa, épiderme et aleurone. Actuellement, la valorisation du son de blé reste faible malgré son potentiel nutritionnel. Or ce potentiel permettrait un développement d’additifs alimentaires à haute valeur ajoutée si un fractionnement correct suivi d’une analyse histochimique complète des factions obtenues pouvait être réalisés. Parmi les méthodes de fractionnement, note choix s’est porté sur le debranning qui se base sur le retrait séquentiel des différentes couches extérieures du blé (voir la communication « Mise au point du fractionnement par debranning des tissus périphériques du blé tendre (Triticum aestivum) et du blé dur (Triticum durum) ». Afin de quantifier l’efficacité du fractionnement, l’investigation de la répartition des tissus au sein des fractions produites a été réalisée par l’étude macroscopique (visuelle) et microscopique (coloration histologique spécifique) des grains et des fractions. Un modèle mathématique qui permet l’appréciation de la distribution des couches dans les différentes fractions a également été développé sur base des bio-marqueurs et de la composition biochimique des fractions. L’étude visuelle macroscopique montre que les grains dans tous les cas attaqués de façon hétérogène et ce en raison de la géométrie particulière des grains de blé. L’étude histologique microscopique montre que, malgré cela, certaines fractions sont enrichies en tissus particuliers. Donc, quelque soit la variété étudiée, les fractions obtenues par debranning présenteront toujours une hétérogénéité de composition tissulaire. Après étude du profil nutritionnel (analyse composition chimique), la variété Karim semble la plus intéressante, car elle est riche en protéines, lipides et minéraux. Au niveau des fractions, pour toutes les variétés, la fraction F1 présente le meilleur potentiel. [less ▲]

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See detailMise au point du fractionnement par debranning des tissus périphériques du blé tendre (Triticum aestivum) et du blé dur (Triticum Durum)
Roiseux, Olivier; Ben Hamouda, Mohamed Salah; Olive, Gilles et al

Poster (2015, March 15)

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Depuis longtemps, le blé est broyé pour donner soit la farine dans le cas des blés tendres, soit de la semoule dans le cas ... [more ▼]

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Depuis longtemps, le blé est broyé pour donner soit la farine dans le cas des blés tendres, soit de la semoule dans le cas des blés durs, ceci correspond en fait à la majorité de l’albumen. Le son de blé est un coproduit de cette transformation et consiste en un empilement de différents tissus : péricarpe externe et interne, testa, épiderme et aleurone. A l’heure actuelle, la valorisation du son de blé est limitée malgré son potentiel nutritionnel. Un fractionnement spécifique de ces tissus, conduisant à la production de fractions ciblées à haute valeur ajoutée, permettrait de mieux exploiter ce potentiel. Parmi les méthodes de fractionnement par voie sèche, le debranning permet le retrait séquentiel des différentes couches extérieures du blé mettant en jeu l’abrasion contre une surface abrasive et la friction des grains entre eux. L’étude a porté sur deux variétés de blé tendre (Julius et Sahara) et deux de blé dur (Karim et Razzek). En raison de différences physiques comme la dureté ou la taille et la forme des grains, des cycles de traitement adéquats pour chacun des variétés dans le but de mettre en évidence leurs différences comportementales. Les quatre fractions (F1 ; F2 ; F3 ; F4) obtenues ont alors été analysées statistiquement (moyenne, coefficient de variation, minimum et maximum, intervalles de confiance) afin de juger de la conformité de ces fractions en termes de pourcentage massique par rapport au but désiré. Les moyennes et intervalles de confiance montrent que les fractions développées sont conformes aux couches histologiques d’un point de vue massique, vis à vis des valeurs « objectifs » fixées par rapport à la littérature scientifique. [less ▲]

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See detailTECHNICAL CHALLENGES IN CHOLESTEROL REMOVAL FROM DAIRY PRODUCTS
Malik, Priyanka ULg; Danthine, Sabine ULg; Paul, Aman ULg et al

Poster (2015, March 15)

Milk is a natural complex system present as oil in water emulsion. The natural organisation of milk fat globules is stabilized by the presence of a natural membrane, called the milk fat globule membrane ... [more ▼]

Milk is a natural complex system present as oil in water emulsion. The natural organisation of milk fat globules is stabilized by the presence of a natural membrane, called the milk fat globule membrane. It has tripartite structure consisting of a monolayer facing the inner triacylglycerol core and an external bilayer. Apart from giving the nutritive value, milk fat globule membrane also contributes towards the techno-functional properties of the dairy products. The milk fat globule membrane is composed of both polar lipids and proteins. Cholesterol is also present in milk fat globule membrane and accounts for about 2% of milk fat globule membrane. Increased consumer awareness has created a perceived demand for low cholesterol products. The World Health Organization and American Heart Association has also recommended that consumers reduce their consumption of saturated fatty acids and cholesterol to lower the risk of coronary heart disease. Therefore, many researchers have developed different methods for reducing cholesterol in dairy and food products. These methods include physical process (vacuum steam distillation, short path molecular distillation and supercritical fluid extraction), biological process (cholesterol reductase and cholesterol oxidase), complexation method (adsorption with saponin, digitonin and cyclodextrin) and chemical process. Most of these methods are very efficient in process of cholesterol removal. However, most of these methods have various drawbacks for application in dairy industry like, formation of toxic oxidation products, denaturation of proteins, loss of low molecular weight triglycerides, loss of volatile components, loss of flavour compounds etc. This leads to loss of nutritive value of dairy products. Thus, the objectives of cholesterol removal from milk and milk products should be, firstly focusing on the maximum cholesterol removal, secondly maintaining the nutritional quality comparable to the control and thirdly the process of cholesterol removal should not compromise the techno functional properties of the dairy products. [less ▲]

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See detailAnhydrous Milk Fat enrichment with 13C-­triacylglycerol tracers: effects on thermal and structural behavior.
Danthine, Sabine ULg; Vors, Cécile; Blecker, Christophe ULg et al

Poster (2015, March 15)

Dietary lipids are incorporated in food products under different types of structures, e.g., as dispersed lipid droplets (in oil -in -water emulsions, like creams) or as a continuous lipid phase (in water ... [more ▼]

Dietary lipids are incorporated in food products under different types of structures, e.g., as dispersed lipid droplets (in oil -in -water emulsions, like creams) or as a continuous lipid phase (in water -in -oil emulsions, like butter for example). The crystallization, melting behavior and polymorphic stability of fats are determined by the behavior of the TAGs they contain. In clinical studies, there is a need to add some 13C TAGs as tracers to the ingested fats in order to track their metabolic fate. However, this procedure could modify the physicochemical properties of the fat. The present study was conducted in the framework of a clinical trial aiming at highlighting the effect of the physical structure of a fat (droplets in 0/W emulsion or bulk) in a meal on the absorption, chylomicron transport and further metabolic handling of dietary fatty acids (1). We therefore monitored the thermal and polymorphic behavior of anhydrous milk fat (AMF) enriched in tracers (a mixture of tripalmitin, triolein and tricaprylin; at 2 different concentrations: 1.5 and 5.7 wt%) using DSC and XRD and further compared it to the native AMF. The addition of 13C TAGs modified the AMF melting profile, especially at high concentration. The enriched AMF was completely melted at around 37°C, i.e. close to the body temperature. However, under some conditions, the AMF enriched in high 13C TAGs concentration remained crystallized at 37°C. Similar trends were observed in both systems (bulk vs emulsified). Moreover, AMF polymorphic behavior was also modified upon tracer addition. While only β’ form was observed in the native AMF, the 13 -form was detected in the AMF containing high 13C TAGs concentration. Importantly, low concentration of tracers should not have high impact on human digestive physiology. However more attention should be paid to physicochemical structure when high concentrations are added. (1) Vors et al. 2013. Modulating absorption and postprandial handling of dietary fatty acids by structuring fat in the meal: a randomized cross -over clinical trial. Am J Clin Nutr, 97(1): 23-36. [less ▲]

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See detailFood Compounds from Meadow Grasshoppers
Paul, Aman ULg; Frederich, Michel ULg; Uyttenbroeck, Roel ULg et al

Poster (2015, March 15)

Eating insects as food, particularly grasshopper is practiced in many cultures throughout the world. Meadow grasshopper (Chorthippus parallelus) is commonly found in Europe and some part of Asia. It is ... [more ▼]

Eating insects as food, particularly grasshopper is practiced in many cultures throughout the world. Meadow grasshopper (Chorthippus parallelus) is commonly found in Europe and some part of Asia. It is already known that grasshoppers of Chorthippus species are consumed as food in countries such as Thailand. With the aim of evaluating the nutritional potential of this insect species the proximate nutritional composition of grasshoppers caught from the local fields was realized. Besides this, the fatty acid profile of extracted lipids, amino acid profile and mineral composition of the insect was also revealed. Results suggest that meadow grasshopper is an excellent source of protein and essential amino acids. Lipids extracted from the grasshopper have an interesting fatty acid composition. Also the grasshopper contains some minerals that are important for body. With such protein content, amino acid profile, fatty acid profile of the lipids and mineral content this grasshopper species could present an interesting alternate to conventional protein sources. [less ▲]

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See detailThermal and structural behavior of two lauric fats compared to AMF in bulk and oil-in-water emulsion states
Petrut, Raul Flaviu ULg; Anihouvi, Prudent Placide; Blecker, Christophe ULg et al

Poster (2015, March 15)

In a previous study the thermal and polymorphic behavior of four different industrial lauric fats which are sold under the same commercial description, was compared (1). According to the findings the four ... [more ▼]

In a previous study the thermal and polymorphic behavior of four different industrial lauric fats which are sold under the same commercial description, was compared (1). According to the findings the four fats were split in two groups based on the similarities found at polymorphic level. In the present paper two of these industrial lauric fats (F1 and F2, one from each group) were incorporated into oil -in -water emulsions. The objective of this study was to point out the differences in the crystallization and polymorphic behavior between bulk and emulsified fat. Moreover anhydrous milk fat (AMF) was used in the same way for comparison. For that purpose, the fats were investigated for their thermal and polymorphic behavior by differential scanning calorimetry (DSC) and X-ray diffraction (XRD), both in bulk and emulsified state. The DSC and X -Ray investigations made possible the observation of the differences in the crystallization behavior and kinetics that occurred for those fats in the bulk and emulsified state. 1. Anihouvi, P.P., C. Blecker, A. Dombree, S. Danthine, Comparative Study of Thermal and Structural Behavior of Four Industrial Lauric Fats, Food Bioprocess Technol. 6:3381-3391 (2013) [less ▲]

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See detailPhysicochemical properties and thermal behaviour of African wild mango (Irvingia gabonensis) seed oil.
Yamoneka, Juste; Malumba Kamba, Paul ULg; Blecker, Christophe ULg et al

Poster (2015, March 15)

African wild mango (lrvingia gabonensis) is now recognized for its numerous food and medicinal uses. This plant produces seeds rich in fat, which is traditionally used as a soup thickener. in the present ... [more ▼]

African wild mango (lrvingia gabonensis) is now recognized for its numerous food and medicinal uses. This plant produces seeds rich in fat, which is traditionally used as a soup thickener. in the present study, the proximate composition of seeds from lrvingia gabonensis is reported. The oil from the seeds was then solvent extracted; its fatty acid (FA) and triacylglycerol (TG) profiles were determined. Besides this chemical characterization, the melting and crystallization behaviour of the extracted fat was studied by pNMR, DSC and X-ray diffraction. The result of this investigation showed that the seeds from lrvingia gabonensis (IG) represent an important source of lipids (69-75%), rich in myristic (49.8%) and lauric acid (37%). This fat can be classified among "lauric fats". IG oil presents a good oxidative stability due to its low content in unsaturated fatty acid. The melting profiles of IG oil indicates that a high amount of fat remains solid at temperatures up to 30°C; the complete melting was detected at around 40C. The most stable polymorph of this fat is the β'1 -form. [less ▲]

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See detailPhysicochemical properties and thermal behaviour of African wild mango (Irvingia gabonensis) seed oil.
Yamoneka, Juste; Malumba Kamba, Paul ULg; Blecker, Christophe ULg et al

Poster (2015, March 15)

Plants belonging Dacryodes and lrvingia genus have great economic importance in Central and West Africa. lrvingia gabonensis (IG) produces a seed rich in fats, traditionally used as a soup thickener ... [more ▼]

Plants belonging Dacryodes and lrvingia genus have great economic importance in Central and West Africa. lrvingia gabonensis (IG) produces a seed rich in fats, traditionally used as a soup thickener. Fruit of Dacryodes edulis (DS) contains a pulp how are also rich in fat. Its seed constitute a big waste problem in towns and village remains not exploitable by local people however that may be valued as a resource for various components. Some study shows that this seed contented a proportion of oils that would be an alternative in the substitution of diesel relevant to their physicochemical properties. Despite the potential of two different oils, theirs scientific data still lack. In this work, thermo-physical behaviour of those two oils is compared in the aim to improving knowledge about properties of those oils that will promote their valorisation in industry scale. The result of this investigation showed that IGO have a highest proportion of oil content with 72.38% compared to DSO (14.64%). IGO is rich in myristic (49.8%) and lauric fatty acid (37%) but DSO sample was found to possess a higher proportion of linoleic acid (35.13%), palmitic (32.67%), oleic (17.70%) but lower proportion of stearic (9.97%). SFC of IGO was the highest at all temperatures. IGO is solid at room temperature with a complete melting at 40°C but DSO is liquid at room temperature. The polymorphism profile of IGO and DSO shows the 13' form stable during heating and a transition to liquid state without passage at β form. [less ▲]

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See detailCaractérisation physico-chimique et structurale de la poudre et des ulvanes de l'algue ulva lactuca
Guidara, Mariem; Yaich, Hela; Garna, Haikel et al

Poster (2015, March 15)

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See detailEfficacy of a web-based, center-based or combined physical activity intervention among older adults
Mouton, Alexandre ULg; Cloes, Marc ULg

in Health Education Research (2015)

With more social support and environment-centered interventions being recommended in web-based interventions, this study examined the efficacy of three intervention conditions aimed at promoting physical ... [more ▼]

With more social support and environment-centered interventions being recommended in web-based interventions, this study examined the efficacy of three intervention conditions aimed at promoting physical activity (PA) in older adults. The efficacy analyses included the self-reported PA level, stage of change for PA and awareness about PA among participants. Eligible participants (N = 149; M = 65 years old, SD = 6), recruited in a unique Belgian French-speaking municipality, were randomized in four research arms for a 3-month intervention: (i) web-based; (ii) center-based; (iii) mixed (combination of web- and center-based); and (iv) control (no intervention). Web-based condition included a PA website and monthly tailored emails whereas center-based condition comprised 12 sessions (1 per week) of group exercising. With a significant increase in PA, the PA stage of change and the PA awareness at 12 months, the mixed intervention condition seemed to include the key social and motivating elements for sustainable behavior change. Center-based intervention was more likely to produce significant improvements of the PA level and the stage of change for PA change whereas web-based intervention was more likely to extend the awareness about PA. [less ▲]

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See detailDouble thermo-responsive hydrogels from poly(vinylcaprolactam) containing diblock and triblock copolymers
Thomassin, Jean-Michel ULg; Mathieu, Kevin ULg; Kermagoret, Anthony ULg et al

in Polymer Chemistry (2015), 6(10), 1856-1864

The thermally-induced gelation and gel properties of concentrated aqueous solutions of double thermoresponsive poly(N-vinylamide)-based di- and triblock copolymers are studied by rheology. The copolymers ... [more ▼]

The thermally-induced gelation and gel properties of concentrated aqueous solutions of double thermoresponsive poly(N-vinylamide)-based di- and triblock copolymers are studied by rheology. The copolymers under investigation, prepared by cobalt-mediated radical polymerization and coupling reactions, are composed of poly(vinylcaprolactam) (PNVCL) blocks and of a statistical poly(vinylcaprolactam-stat-vinylpyrrolidone) segment with a cloud point temperature (TCP) higher than that of PNVCL. Heating the di- and triblock solutions beyond the first phase transition temperature favors gel formation while heating above the second TCP leads to opaque gels without macroscopic demixing. Moduli of the triblock hydrogels are systematically higher than those of the corresponding diblocks, even above the second transition. Rheological data suggest distinct micellar structures for each copolymer architecture: densely packed micelles of diblocks and 3-D networks of bridged micelles for triblocks. Strain sweep experiments also emphasize the positive effect of the micelle bridging on the elasticity and stability of the hydrogels. The formation and properties of the obtained gels are also shown to depend on the copolymer concentration, block length, and composition. Addition of salt also allows us to tune the phase transition temperatures of these double thermoresponsive hydrogels. [less ▲]

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See detailunité: Eau-Environnement-Développement (ULg Campus Arlon): la télédétection au service de l'agriculture
Wellens, Joost ULg; Lang, Marie ULg; Benabdelouahab, Tarik et al

Diverse speeche and writing (2015)

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See detailThe role of personal goals in episodic future thought
D'Argembeau, Arnaud ULg

Conference (2015, March 14)

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See detailPrognostic value of (18)F-FDG PET/CT in liver transplantation for hepatocarcinoma.
Detry, Olivier ULg; Govaerts, Laurence; De Roover, Arnaud ULg et al

in World journal of gastroenterology : WJG (2015), 21(10), 3049-54

AIM: To evaluate the prognostic value of pretreatment FDG positron emission tomography computed tomography (PET-CT) in patients with hepatocarcinoma treated by liver transplantation (LT). METHODS: The ... [more ▼]

AIM: To evaluate the prognostic value of pretreatment FDG positron emission tomography computed tomography (PET-CT) in patients with hepatocarcinoma treated by liver transplantation (LT). METHODS: The authors retrospectively analyzed the data of 27 patients (mean age 58 +/- 9 years) who underwent FDG PET-CT before LT for hepatocarcinoma. Mean follow-up was 26 +/- 18 mo. The FDG PET/CT was performed according to a standard clinical protocol: 4 MBqFDG/kg body weight, uptake 60 min, low-dose non-enhanced CT. The authors measured the SUVmax and SUVmean of the tumor and the normal liver. The tumor/liver activity ratios (RSUVmax and RSUVmean) were tested as prognostic factors and compared to the following conventional prognostic factors: MILAN, CLIP, OKUDA, TNM stage, alphafoetoprotein level, portal thrombosis, size of the largest nodule, tumor differentiation, microvascular invasion, underlying cirrhosis and liver function. RESULTS: Overall and recurrence free survivals were 80.7% and 67.4% at 3 years, and 70.6% and 67.4% at 5 years, respectively. According to a multivariate Cox model, only FDG PET/CT RSUVmax predicted recurrence free survival. Even though the MILAN criteria alone were not predictive, it is worth noting that none of the patients outside the MILAN criteria and with RSUVmax < 1.15 relapsed. CONCLUSION: FDG PET/CT with an RSUVmax cut-off value of 1.15 is a strong prognostic factor for recurrence and death in patients with HCC treated by LT in this retrospective series. Further prospective studies should test whether this metabolic index should be systematically included in the preoperative assessment. [less ▲]

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See detailLa prevención cuaternaria en la clínica cotidiana.
Jamoulle, Marc ULg; Bernstein, Jorge; Pizzanelli, Miguel et al

Conference (2015, March 14)

Remue méninge sur les développements futur du concept de prévention quaternaire

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See detailÉtude d’une stratégie diplomatique: l’internonce Antonio Bichi et l’absolution de Charles IV de Lorraine (1645)
Regibeau, Julien ULg

Conference (2015, March 13)

Le 22 décembre 1645, l’internonce en poste à Bruxelles, Antonio Bichi, donne l’absolution à Charles IV de Lorraine . La sentence prononcée par l’envoyé pontifical doit mettre fin à plus de trois années de ... [more ▼]

Le 22 décembre 1645, l’internonce en poste à Bruxelles, Antonio Bichi, donne l’absolution à Charles IV de Lorraine . La sentence prononcée par l’envoyé pontifical doit mettre fin à plus de trois années de tensions qui font suite à la bulle d’excommunication fulminée par le pape Urbain VIII à l’encontre du duc. Pour le Saint-Siège l’enjeu diplomatique de ce geste est grand. Charles IV, duc de Lorraine et de Bar, est en effet un membre important du parti des dévots, hostile à Richelieu et à sa politique d’abaissement de la maison d’Autriche. Réfugié aux Pays-Bas depuis l’occupation de ses états par le cardinal, en 1634, il prend part aux dernières phases de la guerre de Trente Ans en mettant ses troupes au service des Habsbourg, aussi bien en France que dans l’Empire. Or, l’excommunication du duc comme la mauvaise volonté dont celui-ci semble faire preuve pour répondre aux exigences de la Curie romaine ont peu à peu créé des dissensions au sein du clergé et du gouvernement des Pays-Bas. L’irritation qui règne menacerait même la bonne conduite de la guerre menée contre la France et ses alliés protestants. Si, à première vue, la papauté ne prend pas une part active dans ce conflit, elle veille naturellement, à travers ses nonces, aux intérêts catholiques qui sont en jeu. J'ai choisi, à l’occasion de ce colloque, d'étudier plus en détail la conduite de l’internonce Bichi dans le retour en grâce de Charles IV et son absolution en 1645. À cette occasion, j'ai voulu dégager, d’une part, les stratégies mises en place par le prélat pour arriver à ses fins (maîtrise de l’information, entreprise de désinformation et de dénigrement du duc,…) et, d’autre part, les acteurs et les réseaux avec lesquels il est en prise lors de ces négociations (gouvernement des Pays-Bas espagnols, confesseurs, parti des dévots, ordres religieux, Saint Office,…). Une telle analyse devrait permettre de saisir la nature et l’étendue des ressources que l’internonce utilise afin de mener une véritable politique de détente, propre à réconcilier les intérêts politico-religieux et les intérêts juridico-dogmatiques du Saint-Siège. Je désirerais, par cet exercice apporter une contribution à la compréhension de la politique menée par les nonces du Saint-Siège lors de la fin de la guerre de Trente Ans et à l’occasion des Congrès de Westphalie ; moments diplomatiques habituellement considérés par l’historiographie comme étant défavorables à la papauté. [less ▲]

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See detailJustice révolutionnaire v. justice d’Etat. Les années de plomb en Italie, entre représentations cinématographiques et représentations juridiques
Thirion, Nicolas ULg; Pasteger, David ULg

Conference (2015, March 13)

La présente contribution a une double ambition : d’une part, étudier, illustrations cinématographiques à l’appui, l’acte de juger et ses prodromes (enquêtes, procédures, interrogatoires, etc.), dans un ... [more ▼]

La présente contribution a une double ambition : d’une part, étudier, illustrations cinématographiques à l’appui, l’acte de juger et ses prodromes (enquêtes, procédures, interrogatoires, etc.), dans un contexte géographique et historique bien déterminé – en l’espèce, l’Italie des années de plomb – ; d’autre part, examiner les situations ainsi rencontrées à la lumière d’une théorie du droit – en l’occurrence, la théorie de la pluralité des ordres juridiques de Santi Romano – particulièrement éclairante pour comprendre les ressorts de la lutte à laquelle se livrèrent, dans ce cadre, organisations subversives, voire terroristes, et forces étatiques, aussi bien d’un point de vue historique que dans les représentations plus ou moins fidèles qui en ont été faites dans le corpus cinématographique retenu pour les besoins de la démonstration. [less ▲]

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See detailL’administration Obama, est-elle dépourvue d’une stratégie internationale ?
Santander, Sébastian ULg

Conference given outside the academic context (2015)

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