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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

Experimental assessment on the enzymatic hydrolysis of hydrothermally pretreated eucalyptus globulus wood / Aloia Romaní in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4653–4663 Titre : Experimental assessment on the enzymatic hydrolysis of hydrothermally pretreated eucalyptus globulus wood Type de document : texte imprimé Auteurs : Aloia Romaní, Auteur ; Gil Garrote, Auteur ; Jose Luis Alonso, Auteur Année de publication : 2010 Article en page(s) : pp. 4653–4663 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Enzymatic  hydrolysis. Résumé : Hydrothermal processing of Eucalyptus globulus wood was evaluated as a pretreatment for bioethanol manufacture, to assess the effects caused by the severity of wood solubilization, composition of liquors, and spent solid and suceptibility of substrates toward enzymatic hydrolysis. A factorial design was employed to assess the hydrolysis kinetics of spent solids. The liquor to solid ratio (6−20 g/g) and the enzyme to substrate ratio (8−28 FPU/g) were considered as independent variables. Generalized empirical models suitable for predicting glucose concentrations were developed. Using selected substrates and hydrolysis conditions (LSR = 6 g/g, ESR = 28 FPU/g), media containing more than 82 g glucose/L were obtained (with cellulose-to-glucose conversions of 75−80%), whereas cellulose-to-glucose conversions of 80−100% were obtained under a variety of experimental conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100154m [article] Experimental assessment on the enzymatic hydrolysis of hydrothermally pretreated eucalyptus globulus wood [texte imprimé] / Aloia Romaní, Auteur ; Gil Garrote, Auteur ; Jose Luis Alonso, Auteur . - 2010 . - pp. 4653–4663. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4653–4663 Mots-clés : Enzymatic  hydrolysis. Résumé : Hydrothermal processing of Eucalyptus globulus wood was evaluated as a pretreatment for bioethanol manufacture, to assess the effects caused by the severity of wood solubilization, composition of liquors, and spent solid and suceptibility of substrates toward enzymatic hydrolysis. A factorial design was employed to assess the hydrolysis kinetics of spent solids. The liquor to solid ratio (6−20 g/g) and the enzyme to substrate ratio (8−28 FPU/g) were considered as independent variables. Generalized empirical models suitable for predicting glucose concentrations were developed. Using selected substrates and hydrolysis conditions (LSR = 6 g/g, ESR = 28 FPU/g), media containing more than 82 g glucose/L were obtained (with cellulose-to-glucose conversions of 75−80%), whereas cellulose-to-glucose conversions of 80−100% were obtained under a variety of experimental conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100154m

Ion-exchange processing of fermentation media containing lactic acid and oligomeric saccharides / Beatriz Gullón in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3741–3750 Titre : Ion-exchange processing of fermentation media containing lactic acid and oligomeric saccharides Type de document : texte imprimé Auteurs : Beatriz Gullón, Auteur ; Jose Luis Alonso, Auteur ; J. C. Parajó, Auteur Année de publication : 2010 Article en page(s) : pp. 3741–3750 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Ion-Exchange  Fermentation  Lactic  Acid  Oligomeric  Saccharides Résumé : Ion-exchange processing was employed to separate oligomers and lactic acid (LA) present in fermentation broths derived from apple pomace supplemented with yeast extract (YE) or corn steep liquor (CSL) using Lactobacillus rhamnosus. Experiments were carried out with Amberlite IRA 96 or Amberlite IRA 400 anion-exchange resins. Fermentation media supplemented with YE enabled higher oligosaccharide recovery yields than CSL-supplemented ones, whereas Amberlite IRA 96 provided a better separation of oligomers and LA than Amberlite IRA 400. Starting from a YE-supplemented fermentation medium containing 60.5 g of LA/L and 33.9 g of oligomers/L, column separation with Amberlite IRA 96 led to an effluent during the loading stage, which contained 17.9 g of oligosaccharides/L with an oligosaccharide/LA mass ratio of 90/10 g/g, whereas the regeneration stage provided a solution containing 30 g of LA/L with a oligosaccharide/LA mass ratio of 8/92 g/g. Material balances showed that the regeneration effluent contained about 55% of the LA present in the feed stream, whereas only 2.1% was eluted jointly with oligomers during the loading phase. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901397k [article] Ion-exchange processing of fermentation media containing lactic acid and oligomeric saccharides [texte imprimé] / Beatriz Gullón, Auteur ; Jose Luis Alonso, Auteur ; J. C. Parajó, Auteur . - 2010 . - pp. 3741–3750. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3741–3750 Mots-clés : Ion-Exchange  Fermentation  Lactic  Acid  Oligomeric  Saccharides Résumé : Ion-exchange processing was employed to separate oligomers and lactic acid (LA) present in fermentation broths derived from apple pomace supplemented with yeast extract (YE) or corn steep liquor (CSL) using Lactobacillus rhamnosus. Experiments were carried out with Amberlite IRA 96 or Amberlite IRA 400 anion-exchange resins. Fermentation media supplemented with YE enabled higher oligosaccharide recovery yields than CSL-supplemented ones, whereas Amberlite IRA 96 provided a better separation of oligomers and LA than Amberlite IRA 400. Starting from a YE-supplemented fermentation medium containing 60.5 g of LA/L and 33.9 g of oligomers/L, column separation with Amberlite IRA 96 led to an effluent during the loading stage, which contained 17.9 g of oligosaccharides/L with an oligosaccharide/LA mass ratio of 90/10 g/g, whereas the regeneration stage provided a solution containing 30 g of LA/L with a oligosaccharide/LA mass ratio of 8/92 g/g. Material balances showed that the regeneration effluent contained about 55% of the LA present in the feed stream, whereas only 2.1% was eluted jointly with oligomers during the loading phase. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901397k