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Chemical production of pectic oligosaccharides from orange peel wastes / Martina Martinez in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8470–8476 Titre : Chemical production of pectic oligosaccharides from orange peel wastes Type de document : texte imprimé Auteurs : Martina Martinez, Auteur ; Remedios Yáñez, Auteur ; Jose Luis Alonso, Auteur Année de publication : 2010 Article en page(s) : pp. 8470–8476 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oligosaccharides Résumé : Orange peel wastes (OPW) were extracted with water to remove soluble material, and the resulting solid phase (which was obtained at a yield of 48.8 kg/100 kg of OPW, oven-dry basis) was employed as a substrate for the manufacture of pectic oligosaccharides by nonisothermal processing with hot, compressed water (autohydrolysis or hydrothermal treatments). The effects of treatments on the composition of both liquors and spent solids were assessed in terms of the severity factor (Ro). Operating under selected conditions (maximum temperature of 160 °C, corresponding to Ro = 288 min), the oligosaccharide yield (including oligogalacturonides, arabinooligosaccharides, and galactooligosaccharides) accounted for 25.1 kg/100 kg of extracted OPW, whereas limited concentrations monosaccharides and nonsaccharide compounds were present in the reaction media. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101066m [article] Chemical production of pectic oligosaccharides from orange peel wastes [texte imprimé] / Martina Martinez, Auteur ; Remedios Yáñez, Auteur ; Jose Luis Alonso, Auteur . - 2010 . - pp. 8470–8476. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8470–8476 Mots-clés : Oligosaccharides Résumé : Orange peel wastes (OPW) were extracted with water to remove soluble material, and the resulting solid phase (which was obtained at a yield of 48.8 kg/100 kg of OPW, oven-dry basis) was employed as a substrate for the manufacture of pectic oligosaccharides by nonisothermal processing with hot, compressed water (autohydrolysis or hydrothermal treatments). The effects of treatments on the composition of both liquors and spent solids were assessed in terms of the severity factor (Ro). Operating under selected conditions (maximum temperature of 160 °C, corresponding to Ro = 288 min), the oligosaccharide yield (including oligogalacturonides, arabinooligosaccharides, and galactooligosaccharides) accounted for 25.1 kg/100 kg of extracted OPW, whereas limited concentrations monosaccharides and nonsaccharide compounds were present in the reaction media. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101066m

Processing of acacia dealbata in aqueous media / Remedios Yáñez in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6618–6626 Titre : Processing of acacia dealbata in aqueous media : first step of a wood biorefinery Type de document : texte imprimé Auteurs : Remedios Yáñez, Auteur ; Aloia Romaní, Auteur ; Gil Garrote, Auteur Année de publication : 2009 Article en page(s) : pp. 6618–6626 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Acacia  dealbata  Aqueous  media  Autohydrolysis  Stability Résumé : In order to assess the suitability of autohydrolysis as a first biorefinery stage, Acacia dealbata wood samples were heated in aqueous media to a range of 170−240 °C. Under selected operational conditions (maximum temperature, 215 °C), 70% xylan was converted into xylooligosaccharides, whereas cellulose and lignin remained in solid phase with little alteration. The spent solids from treatments contained 65% cellulose (measured as glucan), 8% hemicelluloses, and 27% lignin. Kinetic models describing the Acacia dealbata wood solubilization as well as the autohydrolysis of the polysaccharide fractions (glucan, xylan, and arabinosyl and acetyl substituents of hemicelluloses) were developed. All the models considered sequential, first-order, pseudohomogeneous kinetics, with Arrhenius type dependence on temperature, and provided a satisfactory interpretation of experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900233x [article] Processing of acacia dealbata in aqueous media : first step of a wood biorefinery [texte imprimé] / Remedios Yáñez, Auteur ; Aloia Romaní, Auteur ; Gil Garrote, Auteur . - 2009 . - pp. 6618–6626. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6618–6626 Mots-clés : Acacia  dealbata  Aqueous  media  Autohydrolysis  Stability Résumé : In order to assess the suitability of autohydrolysis as a first biorefinery stage, Acacia dealbata wood samples were heated in aqueous media to a range of 170−240 °C. Under selected operational conditions (maximum temperature, 215 °C), 70% xylan was converted into xylooligosaccharides, whereas cellulose and lignin remained in solid phase with little alteration. The spent solids from treatments contained 65% cellulose (measured as glucan), 8% hemicelluloses, and 27% lignin. Kinetic models describing the Acacia dealbata wood solubilization as well as the autohydrolysis of the polysaccharide fractions (glucan, xylan, and arabinosyl and acetyl substituents of hemicelluloses) were developed. All the models considered sequential, first-order, pseudohomogeneous kinetics, with Arrhenius type dependence on temperature, and provided a satisfactory interpretation of experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900233x