@article {1854, title = { Geographic and intraspecific variability of mesquitol amounts in Prosopis juliflora trees from Kenya }, journal = { EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS }, volume = {78}, year = {2020}, pages = {801-809}, abstract = {

Several studies have shown that the heartwood of Prosopis juliflora contains high amounts of a naturally rare flavan-3-ol compound identified as 2-(3,4-dihydroxyphenyl)chromane-3,7,8-triol otherwise known as (-)-mesquitol (1). It is known to possess strong antioxidant properties, which may be of valuable interest for further valorization. However, no data exists so far showing the variations of its abundance depending on the different geographic habitats of the tree, the age and the different parts of the tree stem. The variability of flavan-3-ols depending on the geographical area and intra-specific variability within P. juliflora trees from Kenya was addressed in this substantive study. The study was done using wood extracts from three different counties in Kenya (Baringo, Garissa and Turkana Counties). Wood samples were separated into two categories of ages; small trees, aged less than 4 years and the big trees, aged more than 8 years. Each sample was divided into five different parts, which included the bark, sapwood, knot wood, heartwood and the pith. Serial extractions were done by the Dionex accelerated solvent extractor using four solvents in increasing polarity (dichloromethane, acetone, toluene: ethanol (2:1 v/v) and finally water). Gas chromatographic analysis coupled to mass spectrometry was employed to identify the different compounds present in the extracts. LC-MS/MS method was thereafter developed and used to confirm the identity and quantify the amounts of mesquitol present. Two other flavan-3-ols identified and quantified included catechin (2) and 4 \&$\#$39;-O-methylgallocatechin (3). A systematic study on the mass spectra and the observed fragmentations of the flavonoids showed that mesquitol compound is the most abundant compound in P. juliflora with high amounts being found in the heartwood and pith of the acetonic extract (47-72\%). Mesquitol abundance was also found to vary depending on the age of the tree and on the geographical areas.

}, author = {S.C. CHEPKWONY and S. DUMARCAY and H. CHAPUIS and A. KIPROP and P. GERARDIN and C. GERARDIN-CHARBONNIER} } @article {1840, title = {Glucose-Biobased Non-Isocyanate Polyurethane Rigid Foams}, journal = { JOURNAL OF RENEWABLE MATERIALS }, volume = {7}, year = {2019}, pages = {301-312}, abstract = {

Glucose-based non-isocyanate polyurethanes (NIPU) were prepared by reaction of glucose with dimethyl carbonate and hexamethylene diamine. These were used to prepare partially biobased polyurethane foams by reaction with NaHCO3 as a blowing agent and addition of a silane coupling agent having different functions such as coreactant and adjuvant to obtain more uniform and smaller cells. The foams were foamed and hardened by applying heat. The foams presented very limited fire resistance indicating that as for synthetic polyurethane foams the eventual use of a fire retardant appears to be necessary. The 2 hours water absorption was used to indicate if close cells or open cells occur. More characteristic is their stress strain behaviour. While compression does indeed flatten the cell walls nonetheless the cellular structure is maintained and the cell walls have not been destroyed. This indicates a certain level of elasticity in the cell walls of formulations containing NaHCO3. In effect the macro-appearance of this foams, confirms this explanation as the foam is densified and holds together.

}, url = {http://tsp.techscience.com//uploads/attached/file/20190325/20190325065121_13446.pdf}, author = {X.D. XI and A. PIZZI and C. GERARDIN and G.B. DU} } @article {1808, title = { Glutaraldehyde-wheat gluten protein adhesives for wood bonding }, journal = { JOURNAL OF ADHESION }, year = {2019}, abstract = {

Wheat gluten protein hydrolysate was used as a biomass feedstock to prepare environmentally friendly protein-based adhesives, with hydrolyzed wheat protein as control. Glutaraldehyde was used to modify it to obtain a glutaraldehyde-wheat protein (GP) adhesive. Polyethylenimine (PEI) was also used as a crosslinking agent. Plywood has been prepared and tested, and its performance was used to measure the wheat gluten protein hydrolysate adhesive bonding performance. Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) were used to analyze the adhesive thermal properties and the microstructures of the cured adhesives by scanning electron microscopy (SEM). The results show that modification by glutaraldehyde can effectively improve the bonding performance of wheat protein adhesives, the plywood bonded strength having been improved by its addition. The effect of PEI as a crosslinking agent became evident. It can greatly improve the bonding properties of glutaraldehyde-modified wheat protein adhesives. TMA analysis indicates that the glutaraldehyde-modified GP adhesive has a higher storage modulus than the unmodified one. The modulus of the adhesive increased after adding the PEI cross-linking agent.

}, author = {X.D. XI and A. PIZZI and C. GERARDIN and J.J. LIAO and S. AMIROU and S. ABDALLA} } @article {1779, title = {Green extraction process of tannins obtained from Moroccan Acacia mollissima barks by microwave: Modeling and optimization of the process using the response surface methodology RSM}, journal = { ARABIAN JOURNAL OF CHEMISTRY }, volume = {12}, year = {2019}, pages = {2668-2684}, abstract = {

The effect of extraction conditions on polyphenols contents and condensed tannins by microwave-assisted extraction (MAE) was studied for the first time to our knowledge. Moroccan barks of Acacia mollissima was used to extract phenolic compounds. The variables studied are the following: power extraction, time extraction and solvent nature. Five powers extraction were tested: 150 W, 250 W, 300 W, 450 W and 600 W. A significant effect of power extraction on the extractable nature was proved by ANOVA and Student test. The yields were also affected by time extraction. Different solvent (water, ethanol, methanol and ethyl acetate) were tested to evaluate the best extraction solvent according to the extractable nature. Highest polyphenols contents were obtained with methanol. The proportion of this solvent, time extraction and power extraction were optimized using the response surface methodology (RSM). A face-centered composite design (FCCD) was applied to evaluate the effects of these variables on the polyphenols and condensed tannins contents. For each experiment, the extraction yield, the total polyphenolic contents and the condensed tannins contents were quantified using colorimetric essays. The extracts were characterized by their reactivity to formaldehyde and reverse phase high pressure liquid chromatography (RP-HPLC). The highest polyphenols content was obtained at 156 W using 80\% of methanol during 5 min. For condensed tannins, the highest content of cyanidin was obtained at 182 W using 20\% of methanol during 3.66 min. RSM applied in MAE, permitted to develop green extraction process of polyphenols and tannins extracted, using lower microwave power and methanol proportion with a shortest time extraction and in the same time improve the quantity of extractables obtained from renewable natural resource.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-01597950}, author = {N. RHAZI and H. HANNACHE and M. OUMAM and A. SESBOU and B. CHARRIER and A. PIZZI and F. CHARRIER-EL-BOUHTOURY} } @article {1738, title = { The gripped-box model: A simple and robust formulation of sorption hysteresis for lignocellulosic materials }, journal = { CONSTRUCTION AND BUILDING MATERIALS }, volume = {170}, year = {2018}, pages = {716-724}, abstract = {

A new formulation is proposed for describing the moisture sorption hysteresis in lignocellulosic products. This model introduces the concept of gripped-box. This concept allows complex experimental pathways to be fitted with only two adjustable parameters, including the closure of scanning loops without any pumping effect. The product history is embedded in a unique internal variable, which defined the actual window of interest. The formulation proposed in the present work can be easily implemented in existing computational softwares. Based on comprehensive experiments, the model parameters were defined for five lignocellulosic materials largely used in the building construction.

}, url = {https://hal.archives-ouvertes.fr/hal-01829790}, author = {R. REMOND and G. ALMEIDA and P. PERRE} } @article {1622, title = { Ground plant meal potential market, functional properties and applications }, journal = { OCL-OILSEEDS AND FATS CROPS AND LIPIDS }, volume = {23}, year = {2016}, abstract = {

The growing demand of bio-sourced products leads to an increasing interest for the development of new resources of raw materials. In order to generate a higher economic value in the oleoproteaginous sector, meals, co-products of oil extraction present qualities capable of being exploited in a wide range of sectors. These meals are mainly commercialized in feed application, but remain relatively weak used in the chemistry domain or even in food. To enlarge these applications, the pre-treatment of the raw material by grinding and air-classification offers technological outlooks for the conception of new extraction processes of interesting components. The present publication has the following goal: to examine the diversification of oleoproteaginous meal market, out of traditional usage in the chemistry domain; to characterize the meals chemical composition and their techno-functional properties; to evaluate the feasibility of valorizing these meals and their derivatives as substitutes or additives allowing the reduction of the level in petro-chemical product, for example, for the production of adhesive formulations for particle boards. To achieve this, different actions have been performed: evaluation of the potential and accessible market starting from metropolitan crops; analysis of the panorama of intellectual property for the identified markets; chemical characterization of ground plant meals and their soluble and insoluble fractions; applicability of the different obtained fractions, in terms of foaming power, emulsifier and gelifier; first application tests starting from rapeseed and sunflower meals in the wood panel board domain. The obtained results have allowed: to draw up a map of the inventive activity bound to the valorization of proteins from rapeseed, sunflower and soy meals and pea flour in various applications, highlighting the dynamism and the growing interest for industrials and academics to use oleo-proteaginous plant proteins; to explore techno-functional properties brought by these plant meals and their derivatives, in particular in the wood panel domain.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-01599499}, author = {A. MOREL and N. MANTRAND and S. BELAID and M. LOPEZ and D. CHEREAU and C. DEMAILLE and S. PAILLER and F. VALTER and O. GALET and J. GUEGUEN and R. KAPEL and A. PIZZI and F. GARRIGUE} } @article {1396, title = {The GSTome reflects the chemical environment of white-rot fungi.}, year = {2015}, author = {A. DEROY and F. SAIAG and Z. KEBBI-BENKEDER and N. TOUAHRI and A. HECKER and M. MOREL-ROUHIER and F. COLIN and S. DUMARCAY and P. GERARDIN and E. GELHAYE} } @article {714, title = {Glutathione Transferases of Phanerochaete chrysosporium: S-glytathionyl-p-hydroquinone reductase belongs to a new structural class}, journal = {Journal of Biological Chemistry}, volume = {286}, year = {2011}, month = {2011}, chapter = {9162-9173}, author = {MEUX, E. and PASCALITA, P. and NGADIN, A. and DIDIERJEAN, C. and MOREL, M. and DUMARCAY, S. and LAMANT, T. and JACQUOT, JP. and FAVIER, F. and GELHAYE, E.} } @article {745, title = {Gluten protein adhesives for wood panels}, journal = {J. Adhesion Sci. Technol.}, volume = {24}, year = {2010}, month = {2010}, chapter = {1583-1596}, author = {LEI, H. and PIZZI, A. and NAVARRETE, P. and RIGOLET, S. and REDL, A. and WAGNER, A.} }