@article {1664, title = { Effect of heat processing on thermal stability and antioxidant activity of six flavonoids }, journal = { JOURNAL OF FOOD PROCESSING AND PRESERVATION }, volume = {41}, year = {2017}, abstract = {

The objective of this paper is on the one hand to study the effect of heat processing (30 to 130 degrees C for 2 h) on the stability and antioxidant activity of six flavonoids (rutin, naringin, eriodictyol, mesquitol, luteolin, and luteolin 7-O glucoside), and on the other hand to establish the relation structure-activity-stability of these compounds. The dependency on temperature of the six kinetics was well described by the Arrhenius law and the main parameters provided by this model are determined and compared in this paper. Activation energies found were 107.3 kJ/mol for rutin, 100.6 for naringin, 33.3 for mesquitol, 68.2 for eriodictyol, 51.4 for luteolin, and 120 for luteolin 7-O-glucoside. The data collected showed that glycosylated flavonoids are more resistant than aglycon flavonoids to heat treatment. Moreover, it was also observed that despite the total degradation of some flavonoids, the treated solutions still have an antioxidant activity.

Practical applicationFlavonoids are mainly consumed in processed foods. Thus, flavonoids often undergo heat processing. Knowing the thermal stability and the evolution of their antioxidant activity are particularly relevant in the field of food processing. The results of this study allow information to be collected on the relationship between heat stability-flavonoid structure and antioxidant activity. This information will be useful for the formulation of new food products or for the design of new food processes.

}, author = {H. CHAABAN and I. IOANNOU and L. CHEBIL and M. SLIMANE and C. GERARDIN and C. PARIS and C. CHARBONNEL and L. CHEKIR and M. GHOUL} } @article {1660, title = { Modification of oil palm fronds lignin by incorporation of m-cresol for improving structural and antioxidant properties }, journal = { INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES }, volume = {104}, year = {2017}, pages = {251-260}, abstract = {

Lignin extracted from oil palm fronds (OPF) underwent chemical modification by incorporating m-cresol into the lignin matrix. This study reports on the physicochemical properties and antioxidant activity of unmodified autohydrolyzed ethanol organosolvlignin (AH EOL) and the modified autohydrolyzed ethanol organosolv lignin (AHC EOL). The lignin samples were analyzed by FFIR, H-1 and C-13 NMR spectroscopy, 2D NMR: HSQC spectroscopy, CHN analysis, molecular weight distribution analysis; GPC and thermal analysis; DSC and TGA. The lignin modification has reduced the hydrophobicity of its complex structure by providing better quality lignin with smaller fragments and higher solubility rate in water (D-AHCEOL.: 42\%\> D-AHEOL: 25\%). It was revealed that the modification of lignin has improved their structural and antioxidant properties, thus venture their possible applications.

}, url = {https://hal.univ-lorraine.fr/hal-01765057}, author = {N.A. SA{\textquoteright}DON and A.A. RAHIM and M.N.M. IBRAHIM and N. BROSSE and M.H. HUSSIN} } @article {1657, title = { The capability of ultrafiltrated alkaline and organosolv oil palm (Elaeis guineensis) fronds lignin as green corrosion inhibitor for mild steel in 0.5 M HCl solution }, journal = { MEASUREMENT }, volume = {78}, year = {2016}, pages = {90-103}, abstract = {

The inhibitive effect of ultrafiltrated oil palm fronds (OPF) lignins on the corrosion of mild steel in 0.5 M HCl solution has been investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PP) and weight loss measurement. The presence of smaller lignin fractions reduces remarkably the corrosion rate of mild steel. The highest corrosion inhibition efficiency for all ultrafiltrated lignins were attained at maximum concentration of 500 ppm (IEP.Soda: 87\% \> IEP.Organosolv: 83\% \> IEP.Kraft: 81\%). The results from this corrosion test clearly reveal that all ultrafiltrated lignins behaved as a mixed-type inhibitor with predominant anodic (organosolv lignin) or cathodic (alkaline lignin) effectiveness. It was deduced that the inhibition process was spontaneous and the inhibitors were mainly physically adsorbed onto the mild steel surface.

}, author = {M.H. HUSSIN and A.A. RAHIM and M.N.M. IBRAHIM and N. BROSSE} } @article {1573, title = { High surface - Highly N-doped carbons from hydrothermally treated tannin }, journal = { INDUSTRIAL CROPS AND PRODUCTS }, volume = {66}, year = {2015}, pages = {282-290}, abstract = {

Nitrogen-doped carbon materials (NCMs) were obtained by amination of tannin by hydrothermal carbonisation (HTC). NCMs presented different morphologies depending on the amination method: (i) powders by HTC of tannin in a concentrated aqueous ammonia solution; (ii) gels without using any crosslinker by HTC in distilled water of tannin first dissolved in concentrated ammonia and then evaporated. Whatever the method, (i) or (ii), HTC was carried out at different temperatures: 180, 190, 200, 210 or 220 degrees C, with further pyrolysis at 900 degrees C under nitrogen. The morphology and chemical composition of the resultant materials were discussed. We compared our results with those reported in the open literature and we concluded that HTC of tannin in a concentrated aqueous ammonia solution allowed obtaining outstanding materials because they have both surface areas, higher than 500 m(2) g(-1), and high N content, around 8 wt.\%.

}, url = {https://hal.archives-ouvertes.fr/hal-01294754}, author = {F.L. BRAGHIROLI and V. FIERRO and M.T. IZQUIERDO and J. PARMENTIER and A. PIZZI and L. DELMOTTE and P. FIOUX and A. CELZARD} } @article {1557, title = {Improved corrosion inhibition of mild steel by chemically modified lignin polymers from Elaeis guineensis agricultural waste}, journal = {MATERIALS CHEMISTRY AND PHYSICS}, volume = {163}, year = {2015}, pages = {201-212}, abstract = {

This article describes that the modification of lignin by incorporation of aromatic scavengers (2-naphthol: AHN EOL and 1,8-dihydroxyanthraquinone: AHD EOL) during delignification process has improved the physical properties of the lignin fractions. Smaller fragments of lignin with high phenolic -OH content, increased solubility and antioxidant activity have led to improved inhibitive property of the modified lignin. The inhibition efficiency (84-93\%) of both modified lignin (500 ppm) were observed to be better than unmodified organosolv lignin (EOL). It was deduced that the inhibition process was spontaneous and the inhibitors were mainly physically adsorbed onto the mild steel surface.

}, author = {M.H. HUSSIN and A.A. RAHIM and M.N.M. IBRAHIM and N. BROSSE} } @article {1397, title = {Investigations on Wood Treatment by Eco-friendly Hydroxypolyurethanes}, journal = { INTERNATIONAL WOOD PRODUCTS JOURNAL }, volume = {6}, year = {2015}, pages = {31-35}, abstract = {

Dimensional stabilisation is a crucial property for using wood in most applications. Therefore an isocyanate-free route is proposed, based on the reaction of various diamines with dicarbonates obtained by addition of two glycerol carbonates moieties on a linker. For the initial experiments, the mildest conditions to perform the reaction are researched with model mono-and polyamines without wood: solvent, temperature, number of equivalent and regioselectivity were investigated. Subsequently, beech wood blocks were impregnated by a double vacuum process involving cyclic carbonates and then polyamines. The key step was a polycondensation performed in the beech blocks after the monomers had been impregnated. Resistance of treatment to leaching, anti-swelling efficiency and decay durability versus Poria placenta were evaluated. Results were promising with ASE values of about 70\% for a weight gain of approximately 30\% after leaching. Biological tests indicated also an improvement of resistance to fungal decay of beech wood.

}, url = {https://hal.univ-lorraine.fr/hal-01597990}, author = {S. DUMARCAY and K. IAYCH and A. LEMOR and P. GERARDIN} } @article {1544, title = {Preparation and Characterization of Lignin Polyols from the Residues of Oil Palm Empty Fruit Bunch}, journal = {BIORESOURCES}, volume = {10}, year = {2015}, pages = {7339-7352}, abstract = {

In this work, lignin polyols were prepared from the liquefaction of kraft lignin and from the direct liquefaction of Elaeis guineensis lignocellulosic waste. The liquefaction reaction was performed with polyhydric alcohols using sulfuric acid as catalyst at 160 degrees C. The physical and chemical characterizations of lignin and lignin polyols were conducted by elemental analysis, Fourier transform-infrared spectroscopy, H-1 and C-13 nuclear magnetic resonance (NMR) spectroscopy, molecular weight distribution, and thermogravimetric analysis (TGA). Quantitative C-13 NMR showed that all aliphatic hydroxyl group values of polyols noticeably increased with the use of the two methods compared to kraft lignin. The average molecular weight analysis of the liquefied product showed that it exhibited high molecular weight compared to kraft lignin. Both structural and thermal characteristics suggest that lignin polyols would be a good substitute for kraft lignin in the synthesis of polymeric compounds such as environmentally friendly resins or wood adhesives, as it presents higher amounts of activated free ring positions, higher molecular weight, and high thermal stability.

}, url = {https://hal.archives-ouvertes.fr/LERMAB-UL/hal-01598213}, author = {A.H. FARIS and M.N.M. IBRAHIM and A.A. RAHIM and M.H. HUSSIN and N. BROSSE} } @article {702, title = {Investigation on the structure and antioxidant properties of modified lignin obtained by different combinative processes of oil palm fronds (OPF) biomass}, journal = {Industrial crops and products. }, volume = {52}, year = {2014}, month = {2014}, chapter = {544-551}, author = {MH. HUSSIN and A. RAHIM and MNM. IBRAHIM and M. YEMLOUL and D. PERRIN and N. BROSSE} } @article {704, title = {Kinetics of the hydrothermal treatment of tannin for producing carbonaceous microspheres}, journal = {Bioresource technology}, volume = {151}, year = {2014}, month = {2014}, chapter = {271-277}, author = {FL. BRAGHIROLI and V. FIERRE and MT. IZQUIERDO and J. PARMENTIER and A. PIZZI and A. CELZARD} } @article {999, title = {Biodegradation of Reactive Blue 4 and Orange G by Pycnoporus sanguineus Strain Isolated in Gabon}, journal = {Bioremed Biodeg}, volume = {4}, year = {2013}, month = {2013}, chapter = {7}, author = {ATTEKE, C. and MOUNGUENGUI, J. and SAHA-TCHINDA, J-B. and NDIKONTAR, M-K. and IBRAHIM, B. and GELHAYE, E. and GERARDIN, P.} } @article {672, title = {Development of a new method for pilot scale production of high grade oil palm plywood: Effect of resin content on the mechanical properties, bonding quality and formaldehyde emission of palm plywood}, journal = {Materials \& Design}, volume = {52}, year = {2013}, month = {2013}, chapter = {828-834}, author = {YEOH-BENG, H. and YUEH-FENG, L. and LUGMAN-ABD, C. and IDRUS, J. and PIZZI, A. and TAHIR-PARIDAH, MD. and HARUN, J.} } @article {689, title = {Hydrothermal treatment kinetics of tannins for producing catbonaceous microspheres}, journal = {Bioresource Techn.}, volume = {151}, year = {2013}, month = {2013}, chapter = {271-277}, author = {F.L. BRAGHIROLI and V. FIERRO and M.T. IZQUIERDO and J. PARMENTIER and A. PIZZI and A. CELZARD} } @article {596, title = {Impact of the lignin structure of three lignocellulosic feedstocks on their organosolv delignification. Effect of carbonium ion scavengers}, journal = { Biomass Bioener}, volume = {52}, year = {2013}, month = {2013}, chapter = {151-158}, author = {YAKINDRA-TIMILSENA, P. and IDI-GUGA, A. and SUDIT-RAKSHIT, K. and BROSSE, N.} } @article {581, title = {Artificial ageing of wood finishes monitored by IR analysis and colour measurements}, journal = {Journal of Applied Polymer Science}, volume = {124}, year = {2012}, month = {2012}, chapter = {1938-1946}, author = {Y. IRMOULI and B. GEORGE and A. MERLIN} } @article {1148, title = {Nitrogen-doped carbon materials produced from hydrothermally treated tannin.}, journal = {Carbon}, volume = {50}, year = {2012}, chapter = {5411}, author = {F. BRAGHIROLI and V. FIERRO and M.T. IZQUIERDO and J. PARMENTIER and A. PIZZI and A. CELZARD} } @article {711, title = {Microwave-assisted synthesis of polyglycerol from glycerol carbonate}, journal = {Journal of Applied Polymer Science}, volume = {120}, year = {2011}, month = {2011}, chapter = {2354-2360}, author = {IAYCH, K. and DUMARCAY, S. and FREDON, E. and GERARDIN, C. and LEMOR, A. and GERARDIN, P.} } @article {1422, title = {Microwave-assisted synthesis of polyglycerol from glycerol carbonate.}, journal = {J. Appl. Polym. Sci., }, volume = {120}, year = {2011}, chapter = {2354-2360}, author = {IAYCH, K. and DUMARCAY, S. and FREDON, E. and GERARDIN, C. and LEMOR, A. and GERARDIN, P.} } @article {1447, title = {Valuable antioxidant compounds from Prosopis juliflora.}, journal = {Journal of Tropical Forest Science.}, volume = {23(2)}, year = {2011}, author = {SIRMAH,P. and MBURU,F. and IAYCH,K and DUMAR{\c C}AY,S. and G{\'E}RARDIN,P.} } @article {718, title = {Valuable antioxidant compounds from Prosopis juliflora}, journal = {Journal of Tropical Forest Science}, volume = {23}, year = {2011}, month = {2011}, chapter = {187-195}, author = {SIRMAH, P. and MBURU, F. and IAYCH, K. and DUMARCAY, S. and GERARDIN, P.} } @article {741, title = {Decay resistance of wood treated with fluorinated waterproofing agents}, journal = {Holzforschung}, volume = {64}, year = {2010}, month = {2010}, chapter = {391-394}, author = {IAYCH, K. and PABON, M. and GERARDIN, C. and GERARDIN, P.} } @article {847, title = {Study of the polymerization of acrylic resins by photocalorimetry: interactions between UV initiators and absorbers.}, journal = {Journal of thermal analysis and calorimetry}, volume = {96}, year = {2009}, month = {2009}, chapter = {911-916}, author = {IRMOULI, Y. and GEORGE, B. and MERLIN, A.} } @article {910, title = {Study of the polymerization of acrylic resins by photocalorimetry: influence of intiators and irradiation wavelength}, journal = {Journal of thermal analysis and calorimetry}, volume = {91}, year = {2008}, month = {2008}, chapter = {675-680}, author = {IRMOULI, Y. and GEORGE, B. and MERLIN, A.} } @article {958, title = {Effect of an oil heat treatment on leachability and biological resistance of boric acid impregnated wood}, journal = {Ann. For. Sci.}, volume = {64}, year = {2007}, month = {2007}, chapter = {673-678}, author = {LYON, F. and THEVENON, M.F. and HWANG, W.J. and IMAMURA, Y. and GRIL, J. and PIZZI, A.} } @article {946, title = {Inorganic UV absorbers for the photostabilization of wood-clearcoating systems: comparison with organic UV absorbers}, journal = {Applied surface science}, volume = {253}, year = {2007}, month = {2007}, chapter = {3737-3745}, author = {ALOUI, F. and AHAJJI, A. and IRMOULI, Y. and GEORGE, B. and CHARRIER, B. and MERLIN, A.} } @article {957, title = {Leachability and termite resistance of wood treated with a new preservative: ammonium borate oleate}, journal = {Holz Roh Werkstoff}, volume = {65}, year = {2007}, month = {2007}, chapter = {359-366}, author = {LYON, F. and PIZZI, A. and IMAMURA, Y. and THEVENON, M.F. and NAMI-KARTAL, S. and GRIL, J.} }