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See detailPreparation and characterization of organic-soluble acetylated starch nanocrystals
Xu, Yue; Ding, Wanqiang; Liu, Ji ULg et al

in Carbohydrate Polymers (2010), 80(4), 1078-1084

Detailed reference viewed: 11 (2 ULg)
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See detailPreparation and characterization of osmodehydrated fruit from lemon and date by-products.
Masmoudi, M.; Besbes, Souhail; Blecker, Christophe ULg et al

Poster (2006, May)

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See detailPreparation and characterization of osmodehydrated fruits from lemon and date by-products
Masmoudi, M.; Besbes, S.; Blecker, Christophe ULg et al

in Food Science & Technology International (2007), 13(6), 405-412

An osmotic dehydration process (ODP) was established in order to formulate osmodehydrated fruits from lemon and date by-products. ODP was conducted at 40 degrees C, maintained using an oven, or a water ... [more ▼]

An osmotic dehydration process (ODP) was established in order to formulate osmodehydrated fruits from lemon and date by-products. ODP was conducted at 40 degrees C, maintained using an oven, or a water bath with continuous stirring. The kinetics of the osmodehydration in a water bath showed a better mass transfer. Then, osmodehydrated fruit (ODF) preparations of about 40 degrees Brix were formulated using different isotonic solutions (sucrose, glucose/sucrose, glucose, and date juice). All the formulated products showed better characteristics (lower acidity, higher sugar content, etc.) than the untreated lemon by-product. The isotonic solution composition influenced their physical characteristics such as microstructure and viscosity. In fact, ODF prepared in glucose and glucose/sucrose solutions presented more open structures, lower viscosities, and water holding capacities (WHC) than the others. The products were microbiologically stable during 3 months at 4 degrees C. These results support the valorization of lemon and date by-products as ODF that could be consumed or incorporated as an ingredient in food formulations. [less ▲]

Detailed reference viewed: 26 (2 ULg)
See detailPreparation and characterization of thermo-responsive gold nanohybrids
Liu, Ji ULg; Hurtgen, Marie ULg; Detrembleur, Christophe ULg et al

Poster (2011, October 25)

Stimuli-responsive nano-materials have been playing increasingly important roles in the biomedical field due to their ability to alter the physico-chemical properties in response to external stimuli, such ... [more ▼]

Stimuli-responsive nano-materials have been playing increasingly important roles in the biomedical field due to their ability to alter the physico-chemical properties in response to external stimuli, such as temperature, pH, ionic strength, magnetic field, etc. Nanohybrids bearing an inorganic core and thermo-responsive polymer shell are particularly applicable in target delivery and controlled drug release. Poly (N-vinylcaprolactam) (PNVCL) and its copolymers, exhibiting lower critical solution temperature (LCST) where the transition between hydrophilic and hydrophobic state happens, is one of the optimal choices for this core/shell structure. Here we present the in-situ fabrication of thermo-responsive gold nanohybrids coated with a novel poly(vinyl alcohol)-b-poly(N-vinylcaprolactam) (PVOH-b-PNVCL) block copolymer prepared by the cobalt-mediated radical polymerization (CMRP). The interaction between both PVOH and PNVCL segments and gold nanoparticles was confirmed by FT-IR spectra. A sharp thermo-induced phase transition with a good reversibility upon change in temperature was detected by DLS and UV/vis spectrometer. Furthermore, the presence of hydrophilic PVOH moieties endows the gold nanohybrids with improved colloidal stability above LCST without any flocculation detected, compared with the gold nanoparticles stabilized with PNVCL homopolymer. This kind of gold nanohybrids can be envisaged as a new drug delivery vehicle. [less ▲]

Detailed reference viewed: 34 (8 ULg)
See detailPreparation and characterization of thermoresponsive iron nanoparticles for biomedical applications
Sibret, Pierre ULg; Aqil, Abdelhafid ULg; Gohy, Jean-François et al

Poster (2008, November 28)

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See detailPreparation and characterization of xerogel catalyst microspheres
Alié, Christelle ULg; Ferauche, Fabrice; Heinrichs, Benoît ULg et al

Conference (2003)

For easier handling and use in fixed bed reactors, Pd-Ag/SiO2 aerogel-like xerogel catalysts were shaped into microspheres using the microencapsulation process developed by BRACE GmbH. Before the bead ... [more ▼]

For easier handling and use in fixed bed reactors, Pd-Ag/SiO2 aerogel-like xerogel catalysts were shaped into microspheres using the microencapsulation process developed by BRACE GmbH. Before the bead production process, the xerogel catalyst was ground in water and mixed with ethylene glycol and sodium alginate, the latter of which is the gelation agent. The beads were formed at a vibrating nozzle and solidified during their fall in a water tank containing calcium ions, which induce cross-linking of the alginate and consequent bead hardening. Preliminary work was done using a syringe instead of the material-consuming BRACE unit. The beads were made from a suspension of dried only, dried and calcined, or dried, calcined, and reduced catalyst. The textural properties of the beads were analyzed by nitrogen adsorption-desorption isotherms and mercury porosimetry; and bead catalytic activity was tested for selective hydrodechlorination of 1,2-dichloroethane. The beads made from a suspension of dried catalyst appear to have properties the closest to that of the xerogel reference catalyst. Porosity and surface area are maintained at their level before bead formation. However conversion of 1,2-dichloroethane decreases after the production process, possibly due to poisoning by calcium ions. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailPreparation and characterization of xerogel catalyst microspheres
Alié, Christelle ULg; Ferauche, Fabrice; Heinrichs, Benoît ULg et al

in Journal of Non-Crystalline Solids (2004), 350

For easier handling and use in fixed bed reactors, Pd-Ag/SiO2 aerogel-like xerogel catalysts were shaped into microspheres using the microencapsulation process developed by BRACE GmbH. Before the bead ... [more ▼]

For easier handling and use in fixed bed reactors, Pd-Ag/SiO2 aerogel-like xerogel catalysts were shaped into microspheres using the microencapsulation process developed by BRACE GmbH. Before the bead production process, the xerogel catalyst was ground in water and mixed with ethylene glycol and sodium alginate, the latter of which is the gelation agent. The beads were formed at a vibrating nozzle and solidified during their fall in a water tank containing calcium ions, which induce cross-linking of the alginate and consequent bead hardening. Preliminary work was done using a syringe instead of the material-consuming BRACE unit. The beads were made from a suspension of dried only, dried and calcined, or dried, calcined, and reduced catalyst. The textural properties of the beads were analyzed by nitrogen adsorption-desorption isotherms and mercury porosimetry; and bead catalytic activity was tested for selective hydrodechlorination of 1,2-dichloroethane. The beads made from a suspension of dried catalyst appear to have properties the closest to that of the xerogel reference catalyst. Porosity and surface area are maintained at their level before bead formation. However conversion of 1,2-dichloroethane decreases after the production process, possibly due to poisoning by calcium ions. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 45 (2 ULg)
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See detailPreparation and characterization of ZnO-TiO(2) films obtained by sol-gel method
Ivanova, T.; Harizanova, A.; Koutzarova, T. et al

in Journal Of Non-Crystalline Solids (2011), 357(15), 2840-2845

The sol-gel route has been applied to obtain ZnO-TiO(2) thin films. For comparison, pure TiO(2) and ZnO films are also prepared from the corresponding solutions. The films are deposited by a spin-coated ... [more ▼]

The sol-gel route has been applied to obtain ZnO-TiO(2) thin films. For comparison, pure TiO(2) and ZnO films are also prepared from the corresponding solutions. The films are deposited by a spin-coated method on silicon and glass substrates. Their structural and vibrational properties have been studied as a function of the annealing temperatures (400-750 degrees C). Pure ZnO films crystallize in a wurtzite modification at a relatively low temperature of 400 degrees C, whereas the mixed oxide films show predominantly amorphous structure at this temperature. XRD analysis shows that by increasing the annealing temperatures, the sol-gel Zn/Ti oxide films reveal a certain degree of crystallization and their structures are found to be mixtures of wurtzite ZnO, Zn(2)TiO(4), anatase TiO(2) and amorphous fraction. The XRD analysis presumes that Zn(2)TiO(4) becomes a favored phase at the highest annealing temperature of 750 degrees C. The obtained thin films are uniform with no visual defects. The optical properties of ZnO-TiO(2) films have been compared with those of single component films (ZnO and TiO(2)). The mixed oxide films present a high transparency with a slight decrease by increasing the annealing temperature. (C) 2011 Elsevier B.V. All rights reserved. [less ▲]

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See detailPreparation and evaluation of liposomes encapsulating synthetic MMP inhibitor (Ro 28-2653) - cyclodextrin complexes
Piette, Marie ULg; Castagne, Delphine ULg; Delattre, Luc ULg et al

in Journal of Inclusion Phenomena and Macrocyclic Chemistry (2007, April), 57(1-4), 101-103

In this study, preparation and evaluation of liposomes, intended for intravenous administration, encapsulating synthetic MMP inhibitor (Ro 28-2653) - cyclodextrin complexes were realized. An increase in ... [more ▼]

In this study, preparation and evaluation of liposomes, intended for intravenous administration, encapsulating synthetic MMP inhibitor (Ro 28-2653) - cyclodextrin complexes were realized. An increase in Ro solubility, via formation of binary (Ro/HP beta CD) or ternary (Ro/HP beta CD/L-lysine) complexes, permitted a similar increase in encapsulation efficiency of liposomes (Table 1). Moreover, Ro release kinetics depend on the encapsulation efficiency. [less ▲]

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See detailPreparation and in vivo toxicity study of solid lipid microparticles as carrier for pulmonary administration
Sanna, V.; Kirschvink, Nathalie; Gustin, Pascal ULg et al

in AAPS PharmScitech (2004), 5(2), 27

The purpose of this research was to investigate the effects of processing conditions on the characteristics of solid lipid microparticles (SLM) with a potential application as carriers for pulmonary ... [more ▼]

The purpose of this research was to investigate the effects of processing conditions on the characteristics of solid lipid microparticles (SLM) with a potential application as carriers for pulmonary administration. Compritol ( 5.0% wt/ wt) SLM dispersions were prepared by rotor-stator homogenization, at different surfactant concentrations and emulsification times. The SLM were characterized, in terms of morphology and size, after lyophilization and sterilization by autoclaving process. In vivo assessment was carried out in rats by intratracheal instillation of either placebo or SLM dispersion, and by bronchoalveolar lavage for cytological analysis. Mean particle size of 4 to 5 mum was achieved using 0.3% and 0.4% ( wt/ wt) of emulsifier ( Poloxamer 188) and emulsification times of 2 and 5 minutes. The particles showed spherical shape and smooth surface. The morphology of microparticles, the size, and the size distribution were not substantially modified after lyophilization and sterilization. Total cell counts showed no significant differences between placebo and SLM 0.5% or 2.5% groups. Regarding cytology, percentage of polymorphonuclear neutrophils and macrophages did not significantly differ between groups. These results suggest that a single intratracheal administration of the SLMs does not induce a significant inflammatory airway response in rats and that the SLMs might be a potential carrier for encapsulated drug via the pulmonary route. [less ▲]

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See detailPreparation and labelling of biodegradable drug nanocarriers
Rieger, Jutta ULg; Qiu, Hongjin; Mazza, Michaël et al

Poster (2003, May 16)

Detailed reference viewed: 8 (1 ULg)
See detailPreparation and partial chemical analysis of milk-fat-globule membrane and mammary tumour virus obtained from swiss albino mice
Calberg-Bacq, C. M.; François, C.; Gosselin, L. et al

in Hoppe Seyler's Zeitschrift für Physiologische Chemie (1974)

Detailed reference viewed: 5 (0 ULg)
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See detailPreparation and pharmacological evaluation of the R- and S-enantiomers of 3-(2’-butylamino)-4H- and 3-(3’-methyl-2’-butylamino)-4H-pyrido[4,3-e]-1,2,4-thiadiazine 1,1-dioxide, two tissue selective ATP-sensitive potassium channel openers
Khelili, S.; De Tullio, Pascal ULg; Lebrun, P. et al

in Bioorganic & Medicinal Chemistry (1999), 7(8), 1513-1520

The preparation and the pharmacological evaluation of the R- and S-isomers of 3-(2-butylamino)-4H-pyrido[4,3-e]-1,2,4-thiadiazine 1,1-dioxide (BPDZ 42) and 3-(3-methyl-2-butylamino)-4H-pyrido[4,3-e]-1,2,4 ... [more ▼]

The preparation and the pharmacological evaluation of the R- and S-isomers of 3-(2-butylamino)-4H-pyrido[4,3-e]-1,2,4-thiadiazine 1,1-dioxide (BPDZ 42) and 3-(3-methyl-2-butylamino)-4H-pyrido[4,3-e]-1,2,4-thiadiazine 1,1-dioxide (BPDZ 44), two potassium channel openers, is described. Their optical purity was estimated by means of capillary electrophoresis (R- and S-BPDZ 42) and chiral HPLC (R- and S-BPDZ 44). The absolute configuration of each isomer of BPDZ 44 was deduced from crystallographic data. Pharmacological assays performed with the R- and S-isomers of BPDZ 44 revealed only slight differences in their activity on pancreatic B-cells but significant differences in their activity on vascular smooth muscle cells: the R-isomer being sixfold more potent than its corresponding S-isomer. The R-isomer of BPDZ 42 was shown to be more potent than its corresponding S-isomer on the endocrine pancreas. S-BPDZ 44 as well as R- and S-BPDZ 42 were found to exhibit tissue selectivity for the pancreatic versus the vascular smooth muscle tissue. [less ▲]

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See detailPreparation and properties of layered silicate nanocomposites based on ethylene vinyl acetate copolymers
Alexandre, Michaël ULg; Beyer, Günter; Henrist, Catherine ULg et al

in Macromolecular Rapid Communications (2001), 22(8), 643-646

(Nano)composites based on ethylene vinyl acetate copolymers (EVA) and montmorillonite modified by various alkylammonium cations were processed by mechanical kneading. Polymer intercalation and filler ... [more ▼]

(Nano)composites based on ethylene vinyl acetate copolymers (EVA) and montmorillonite modified by various alkylammonium cations were processed by mechanical kneading. Polymer intercalation and filler exfoliation were evidenced by X-ray diffraction and transmission electron microscopy, respectively. Nano-composites tensile properties showed that Young's modulus increases significantly even at very low content of the organo-modified filler while preserving high ultimate elongation and tensile stress. The matrix thermal stability in air was increased by 40°C and, interestingly, the obtained nanocomposites present flame retardant properties. TEM micrograph of the nanocomposite based on EVA3 filled with 5 wt.-% of Mont-2CN2C18. [less ▲]

Detailed reference viewed: 54 (3 ULg)
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See detailPréparation aux cliniques de chirurgie pédiatrique
Battisti, Oreste ULg

Learning material (2008)

cours préparatoire aux cliniques et stages en chirurgie viscérale du nouveau-né et de l'enfant.

Detailed reference viewed: 72 (19 ULg)
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See detailPréparation aux cliniques: douleur, inconfort et angoisse chez le nouveau-né et l'enfant
Battisti, Oreste ULg

Learning material (2009)

texte synthtétique concernant la douleur, l'angoisse et l'inconfort chez le nouveau-né et l'enfant, y compris les réflexions éthiques et philosophiques

Detailed reference viewed: 94 (28 ULg)
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See detailPréparation aux cliniques: examen neurologique de l'enfant
Battisti, Oreste ULg

Learning material (2006)

présentation pratique des symptomes et signes de l'examen neurologique chez l'enfant

Detailed reference viewed: 52 (16 ULg)