Documents disponibles écrits par cet auteur

Effect of ethanol organosolv pretreatment on enzymatic hydrolysis of buddleja davidii stem biomass / Hallac, Bassem B. in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1467–1472 Titre : Effect of ethanol organosolv pretreatment on enzymatic hydrolysis of buddleja davidii stem biomass Type de document : texte imprimé Auteurs : Hallac, Bassem B., Auteur ; Sannigrahi, Poulomi, Auteur ; Pu, Yunqiao, Auteur Année de publication : 2010 Article en page(s) : pp 1467–1472 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ethanol  organosolv  pretreatment  Enzymatic  Biomass. Résumé : Ethanol organosolv pretreatment was performed on Buddleja davidii to evaluate this bioresource as a potential feedstock for bioethanol production. B. davidii was pretreated and delignified, while 85% of the glucose content of the untreated material was retained in the pretreated solid fraction. The enzymatic hydrolysis showed that organosolv pretreatment produced solid substrates that were readily digestible by cellulases. Gel-permeation chromatography was used to determine the degree of polymerization (DP) of cellulose, and solid-state cross polarization/magic angle spinning 13C NMR experiments were conducted to study the changes in crystallinity and ultrastructure of cellulose. The results showed a decrease in DP along with an increase in the relative proportions of para-crystalline and amorphous cellulose and a decrease in cellulose Iα and Iβ. Removal of lignin and hemicellulose, reduction in DP, and decrease in the crystalline allomorphs (Iα and Iβ) increased the amenability of the biomass to enzymatic degradation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900683q [article] Effect of ethanol organosolv pretreatment on enzymatic hydrolysis of buddleja davidii stem biomass [texte imprimé] / Hallac, Bassem B., Auteur ; Sannigrahi, Poulomi, Auteur ; Pu, Yunqiao, Auteur . - 2010 . - pp 1467–1472. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1467–1472 Mots-clés : Ethanol  organosolv  pretreatment  Enzymatic  Biomass. Résumé : Ethanol organosolv pretreatment was performed on Buddleja davidii to evaluate this bioresource as a potential feedstock for bioethanol production. B. davidii was pretreated and delignified, while 85% of the glucose content of the untreated material was retained in the pretreated solid fraction. The enzymatic hydrolysis showed that organosolv pretreatment produced solid substrates that were readily digestible by cellulases. Gel-permeation chromatography was used to determine the degree of polymerization (DP) of cellulose, and solid-state cross polarization/magic angle spinning 13C NMR experiments were conducted to study the changes in crystallinity and ultrastructure of cellulose. The results showed a decrease in DP along with an increase in the relative proportions of para-crystalline and amorphous cellulose and a decrease in cellulose Iα and Iβ. Removal of lignin and hemicellulose, reduction in DP, and decrease in the crystalline allomorphs (Iα and Iβ) increased the amenability of the biomass to enzymatic degradation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900683q

Pretreatment of miscanthus x giganteus using the ethanol organosolv process for ethanol production / Nicolas Brosse in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8328–8334 Titre : Pretreatment of miscanthus x giganteus using the ethanol organosolv process for ethanol production Type de document : texte imprimé Auteurs : Nicolas Brosse, Auteur ; Sannigrahi, Poulomi, Auteur ; Arthur Ragauskas, Auteur Année de publication : 2010 Article en page(s) : pp. 8328–8334 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Miscanthus  x  giganteus  Aqueous-ethanol  organosolv  treatment Résumé : A two-step procedure involving a dilute-acid presoaking step and an aqueous-ethanol organosolv treatment has been evaluated and optimized for the conversion of Miscanthus x giganteus (MxG). This process allowed for the efficient fractionation of the raw material into a cellulose-rich residue, an ethanol organosolv lignin fraction, and a water-soluble fraction mainly containing hemicellulose sugars. It was found that the presoaking step not only allowed a better recovery of xylans, but also enhanced the dissolution of lignin in the aqueous ethanol and the digestibility of the remaining cellulose by enzymes. The optimized conditions yielded a solid residue containing about 95% of the initial glucans, from which 98% was recovered after 48 h of enzymatic hydrolysis. In addition, 71% of the lignin was recovered as ethanol organosolv lignin (EOL), and the recovery of the xylans was equivalent to 73% of the xylose present in the raw Miscanthus. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006672 [article] Pretreatment of miscanthus x giganteus using the ethanol organosolv process for ethanol production [texte imprimé] / Nicolas Brosse, Auteur ; Sannigrahi, Poulomi, Auteur ; Arthur Ragauskas, Auteur . - 2010 . - pp. 8328–8334. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8328–8334 Mots-clés : Miscanthus  x  giganteus  Aqueous-ethanol  organosolv  treatment Résumé : A two-step procedure involving a dilute-acid presoaking step and an aqueous-ethanol organosolv treatment has been evaluated and optimized for the conversion of Miscanthus x giganteus (MxG). This process allowed for the efficient fractionation of the raw material into a cellulose-rich residue, an ethanol organosolv lignin fraction, and a water-soluble fraction mainly containing hemicellulose sugars. It was found that the presoaking step not only allowed a better recovery of xylans, but also enhanced the dissolution of lignin in the aqueous ethanol and the digestibility of the remaining cellulose by enzymes. The optimized conditions yielded a solid residue containing about 95% of the initial glucans, from which 98% was recovered after 48 h of enzymatic hydrolysis. In addition, 71% of the lignin was recovered as ethanol organosolv lignin (EOL), and the recovery of the xylans was equivalent to 73% of the xylose present in the raw Miscanthus. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006672