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See detailExtraction and Clean-Up of Milk Samples for PCDD/Fs and cPCBs Analysis
Focant, Jean-François ULg; De Pauw, Edwin ULg

in Organohalogen Compounds (2001), 50

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See detailExtraction and fractionation of cytotoxic metabolites from Galanthus lagodechianus Kem.-Nath
Jokhadze, Malkhaz; Kutchukhidze, J.; Murtazashvilia, T. et al

in Allergology and Immunology (Moscou) (2006), 7

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See detailExtraction and partial purification of tomato leaves hydroperoxide lyase
Fauconnier, Marie-Laure ULg; Lecoq, S.; Marlier, M.

Poster (1995, September 27)

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See detailExtraction by three processes of arabinoxylans from wheat bran and characterization of the fractions obtained
Aguedo, Mario ULg; Fougnies, Christian; DERMIENCE, Michael ULg et al

in Carbohydrate Polymers (2014), 105

Arabinoxylans (AXs) were extracted from destarched wheat bran (DWB) according to different processes, with a view to their production at industrial scale. Two fractions (F3a and F3b, respectively purified ... [more ▼]

Arabinoxylans (AXs) were extracted from destarched wheat bran (DWB) according to different processes, with a view to their production at industrial scale. Two fractions (F3a and F3b, respectively purified on 10 kDa and 100 kDa ultrafiltration membranes) were obtained with low yields by treating DWB with an endoxylanase and this process left a solid residue exhausted in enzyme-extractable AXs (EDWB). F1 and F2 AX fractions were obtained by treatment with sodium hydroxide of respectively DWB and EDWB. The fraction F4 resulted from a hydrothermal treatment of EDWB in a pressure reactor, followed by ethanol precipitation. The different AX fractions were characterized and compared for the composition in monosaccharides, for the contents in fats and in ferulic, phytic and uronic acids, for the molecular mass distribution and the degrees of methylation and acetylation. The alkaline extractions gave one desesterified AX population with molecular mass (MM) higher than 670 kDa and arabinose/xylose ratios (Ara/Xyl) around 1. The enzyme and thermal treatments yielded AXs with two main populations in size-exclusion chromatography (the largest one at 5-12.5 kDa and a second one at 140-160 kDa), having overall Ara/Xyl of respectively 0.7 and 0.5 for both processes. These data bring information about the influence of the process on the characteristics of AX fractions obtained from pretreated wheat bran. Here are also reported processes that enabled to recover enzyme-unextractable AXs from DWB, including an original and up-scalable hydrothermal extraction. Phytate contents of isolated AXs are described for the first time. [less ▲]

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See detailExtraction conditions can greatly influence antioxidant capacity assays in plant food matrices
Michiels, Jean-Albert ULg; Kevers, Claire ULg; Pincemail, Joël ULg et al

in Food Chemistry (2012), 130

The estimated antioxidant capacity of different matrices can vary considerably between research reports. Besides intrinsic factors (not studied here), our work showed that may have various causes. Firstly ... [more ▼]

The estimated antioxidant capacity of different matrices can vary considerably between research reports. Besides intrinsic factors (not studied here), our work showed that may have various causes. Firstly, different methods are used to measure antioxidant capacity. Secondly, the results obtained for a single matrix by one method (such as ORAC) can vary with the extraction conditions. Parameters having a great impact on the amount and composition of antioxidants in extracts, and thus on the measured antioxidant capacity, notably include the extraction solvent composition, temperature, extraction time (duration), solvent-to-solid ratio, and storage conditions. Standardization of the extraction procedure is thus necessary for accurate and reproducible determination of the antioxidant capacity and phenolics in different food matrices by different laboratories. In this study we optimised such a procedure for four fresh plant matrices (orange, apple, leek, and broccoli). The optimised procedure requires extraction in a mixture of acetone/water/acetic acid (70/28/2, v/v/v) for 1 h at 4°C, with a solvent-to-solid ratio of 20 mL per 1 g. Fresh material should be used, but if this is not possible, one may lyophilise the plant matrices or store the extracts for a few days at -20°C before analysis. [less ▲]

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See detailExtraction d'un modèle numérique de terrain au départ d'images stéréoscopiques SPOT sur le bassin versant de l'Oued Tasrafete
Tahiri, Driss; Binard, Marc ULg; Donnay, Jean-Paul ULg

in Géo Observateur (1992, October)

Cette communication présente les résultats de la reconstitution automatique du relief à partir de deux scènes SPOT couvrant une zone montagneuse du nord du Maroc. Le système utilisé (module Digital Ortho ... [more ▼]

Cette communication présente les résultats de la reconstitution automatique du relief à partir de deux scènes SPOT couvrant une zone montagneuse du nord du Maroc. Le système utilisé (module Digital Ortho de ERDAS) s'appuie sur le principe de la corrélation automatique qui, pour la recherche des points homologues, fonctionne hiérarchiquement à plusieurs niveaux de résolution. L'évaluation de la précision du MNT obtenu a été réalisée à l'aide de données altimétriques extraites des cartes topographiques existantes (échelle: 1/50 000) et a révélé une erreur moyenne quadratique de ±15 m. Cette précision est suffisante pour rétablissement d'orthoimages ou pour l'interpolation des courbes de niveau pour des cartes topographiques aux échelles 1/100 000 et plus petites. [less ▲]

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See detailExtraction d'une canine chez un ours polaire
DUFOUR, Pascale ULg; Balligand, Marc ULg; Pypendop, B. et al

in Annales de Médecine Vétérinaire (1995)

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See detailL'extraction de matrices solides
Ziemons, Eric ULg; Hubert, Philippe ULg

Learning material (2007)

La préparation de l'échantillon est une étape clé et indispensable au dosage de l'analyte dans la matrice solide. Les principes de base et applications des procédés dits "conventionnels" (macération ... [more ▼]

La préparation de l'échantillon est une étape clé et indispensable au dosage de l'analyte dans la matrice solide. Les principes de base et applications des procédés dits "conventionnels" (macération, percolation et soxhlet) et "modernes" (micro-ondes,assistée par solvant et en phase supercritique) sont repris dans le document. Compte tenu de l'utilisation et des avantages de l'extraction par les fluides supercritiques, ce procédé est présenté plus en détails. [less ▲]

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See detailExtraction de molécules à haute valeur ajoutée dans un but de maximisation de la valeur créée
Richel, Aurore ULg

Conference (2013)

Les recherches académiques dans le domaine du bioraffinage sont présentées au travers de schémas complets de valorisation. Les matières premières ciblées sont les résidus agricoles et forestiers, les ... [more ▼]

Les recherches académiques dans le domaine du bioraffinage sont présentées au travers de schémas complets de valorisation. Les matières premières ciblées sont les résidus agricoles et forestiers, les cultures énergétiques et les résidus des industries alimentaires. Le cracking et la conversion ultérieure de ces matières premières permettent l'obtention de biocarburants, bioproduits ou nouvelles formulations (filière biomasse-chimie). [less ▲]

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See detailL’extraction des huiles essentielles par micro-ondes : Quels avantages ?
Ramdani, M.; Benchat, N.; Amhamdi, H. et al

Poster (2010)

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See detailExtraction of $\alpha_s$ from deep inelastic scattering at large $x$
Courtoy, Aurore ULg; Liuti, Simonetta

in Physics Letters B (2013), B726

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See detailExtraction of ferulic acid from Walloon agro-industrial by-products.
Barberousse, Hélène; Roiseux, Olivier; Deroanne, Claude et al

Poster (2007, October 11)

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See detailExtraction of ferulic acid, a natural antioxidant, for potential agro-industrial applications.
Barberousse, Hélène; Roiseux, Olivier; Deroanne, Claude et al

Poster (2008, March 05)

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See detailExtraction of land use / landcover – related information from very high resolution data in urban and suburban areas
Van de Voorde, Tim; De Genst, William; Canters, Frank et al

in Goossens, Rudi (Ed.) Remote Sensing in Transition (2004)

Very High Resolution (VHR) satellite images offer a great potential for the extraction of landuse and land-cover related information for urban areas. The available techniques are diverse and need to be ... [more ▼]

Very High Resolution (VHR) satellite images offer a great potential for the extraction of landuse and land-cover related information for urban areas. The available techniques are diverse and need to be further examined before operational use is possible. In this paper we applied two pixel-by-pixel classification techniques and the object-oriented image analysis approach (eCognition) for a land-cover classification of a Quickbird image of a study area in the northern part of the city of Ghent (Belgium). Only small differences in overall Kappa were noted between the best results of the pixel-based approach (neural network classification with Haralick texture measures) and the object-oriented classification (eCognition). A rule-based procedure using ancillary information on elevation derived from a digital surface model was applied on the pixel-based land-cover classification in order to obtain information on the spatial distribution of buildings and artificial surfaces. [less ▲]

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See detailExtraction of lignin from Mediterranean agro-wastes: correlation between pretreatment conditions and lignin chemical structure
Manara, Panagiota; Zabaniotou, Anastasia; Richel, Aurore ULg

Conference (2013, January)

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See detailExtraction Technology
Pfennig, Andreas ULg; Delinski, D; Johannisbauer, W et al

in Industrial Scale Natural Products Extraction, Wiley-VCH Verlag, Weinheim, 181-220 (2011)

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