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See detailLignin extraction from Mediterranean agro-wastes: Impact of pretreatment conditions on lignin chemical structure and thermal degradation behavior
Manara, Panagiota; Zabaniotou, Anastasia; Vanderghem, Caroline ULg et al

in Catalysis Today (2014), 223

Three different types of Mediterranean, agro-industrial wastes (olive kernels, grape pomace/seeds, peach kernels), were subjected to two pretreatment processes, a chemical/organosolv and a physicochemical ... [more ▼]

Three different types of Mediterranean, agro-industrial wastes (olive kernels, grape pomace/seeds, peach kernels), were subjected to two pretreatment processes, a chemical/organosolv and a physicochemical one. The organosolv process included lignocellulosic biomass treatment with formic acid/acetic acid/water (30/50/20, v/v%), for 3 h at 107 °C, while the physicochemical method was conducted by immersing the biomass in a water/ethanol (8/92, v/v%), H2SO4 0.32 M, solvent and further exposing the slurry to microwave irradiation (maximum 250 W) for 1/2 h at 150 °C. Both processes were evaluated regarding the achieved delignification and the purity of the extracted lignins. The effect of the pretreatment processes onto the structure and thermal decomposition behavior of the extracted lignins was investigated via FT-IR and TGA analysis, respectively. The objective of the research work was to investigate potential valorization routes for these biomass agro-residues in the context of a biorefinery, focusing on lignin extraction. The pretreatment results showed that the obtained lignins, derived from both procedures, were of high purity (>82 wt%). Under the organosolv procedure, peach kernel delignification showed the maximum value (∼16 wt%), while under microwave pretreatment, olive kernel delignification showed the maximum value (∼35 wt%). Grape pomace/seeds appeared to be the most resistant in both treatments. [less ▲]

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Peer Reviewed
See detailLignocellulosic biomass pretreatment impact on the extracted lignins chemical structure
Manara, Panagiota; Zabaniotou, Anastasia; Vanderghem, Caroline ULg et al

Poster (2013, October)

Detailed reference viewed: 24 (5 ULg)
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)

Detailed reference viewed: 20 (9 ULg)
Peer Reviewed
See detailMediterranean lignocellulosic biomass delignification and lignin valorization into high-added value components
Manara, Panagiota; Richel, Aurore ULg; Zabaniotou, Anastasia

Conference (2012)

The present study approaches the extraction of lignin samples from several lignocellulosic renewable feedstocks, including raw materials from Greece. The valorization of these lignins samples into high ... [more ▼]

The present study approaches the extraction of lignin samples from several lignocellulosic renewable feedstocks, including raw materials from Greece. The valorization of these lignins samples into high-added value components will also be explored using chemical catalytic routes and “green chemistry” methodology. The present study is a collaboration of Biomass Group of Aristotle University of Thessaloniki, Greece and Gembloux Agro-Bio Tech, in the frame of UBIOCHEM COST ACTION C0903, performed at the Laboratories of Biological and Industrial Chemistry Unit, Gembloux Agro-Bio Tech, University of Liege with samples preparation at AUTh. The lignin extraction from lignocellulosic biomass takes place via chemical, thermal and mechanical routes, including acid or basic processes, steam cracking, steam explosion. Statistical approaches (i.e. response surface methodology) are used for the optimization of processing parameters. Physico-chemical characterization of lignin materials is considered using specific techniques developed by the research team of Agro-Bio-Tech Institute, including qualitative and quantitative mono- and bidimensionnal NMR spectroscopy, MALLS, FT-IR, TGA and chemical methods. The characterization of the lignocellulosic materials before and after pretreatment protocol is investigated regarding the determination of extractives, ash, total lignin contents, and structural carbohydrates as well as proteins contents. Chemical catalytic routes and “green chemistry” methodology is conducted in order to valorize lignin. [less ▲]

Detailed reference viewed: 80 (8 ULg)