Documents disponibles écrits par cet auteur

Assessment of the production of oligomeric compounds from sugar beet pulp / Martina Martinez in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4681–4687 Titre : Assessment of the production of oligomeric compounds from sugar beet pulp Type de document : texte imprimé Auteurs : Martina Martinez, Auteur ; Beatriz Gullón, Auteur ; Henk A. Schols, Auteur Année de publication : 2009 Article en page(s) : pp. 4681–4687 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sugar  beet  pulp  Oligogalacturonides  Arabinooligosaccharides Résumé : In order to obtain pectin-derived oligosaccharides (mainly arabinooligosaccharides and oligogalacturonides), samples of sugar beet pulp (SBP) were subjected to hydrothermal processing under nonisothermal conditions. Experiments carried out to reach temperatures in the range 160−175 °C (corresponding to values of the severity factor R0 in the range 287−835 min) led to comparatively high concentrations of both oligogalacturonides and arabinooligosaccharides. When SBP was treated to achieve a maximum temperature of 160 °C (R0 = 287 min) or 163 °C (R0 = 357 min), the overall amount of oligomers present in the reaction liquors recovered by pressing accounted for 31.2 and 29.9 g/100 g of oven-dried SBP, respectively, with a limited amount of nonvolatile impurities (about 0.15 g/g of oven-dried matter) and a mass ratio of arabinooligosaccharides/oligogalacturonides of about 1:1. Spent solids were washed with water, and the washing liquors were assayed for oligomers. Recovery of washing liquors would increase the overall yield process by 10%, to reach near 33 g/100 g of oven-dried SBP. Washed spent solids (with increased cellulose content) were obtained as a process byproduct. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017753 [article] Assessment of the production of oligomeric compounds from sugar beet pulp [texte imprimé] / Martina Martinez, Auteur ; Beatriz Gullón, Auteur ; Henk A. Schols, Auteur . - 2009 . - pp. 4681–4687. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4681–4687 Mots-clés : Sugar  beet  pulp  Oligogalacturonides  Arabinooligosaccharides Résumé : In order to obtain pectin-derived oligosaccharides (mainly arabinooligosaccharides and oligogalacturonides), samples of sugar beet pulp (SBP) were subjected to hydrothermal processing under nonisothermal conditions. Experiments carried out to reach temperatures in the range 160−175 °C (corresponding to values of the severity factor R0 in the range 287−835 min) led to comparatively high concentrations of both oligogalacturonides and arabinooligosaccharides. When SBP was treated to achieve a maximum temperature of 160 °C (R0 = 287 min) or 163 °C (R0 = 357 min), the overall amount of oligomers present in the reaction liquors recovered by pressing accounted for 31.2 and 29.9 g/100 g of oven-dried SBP, respectively, with a limited amount of nonvolatile impurities (about 0.15 g/g of oven-dried matter) and a mass ratio of arabinooligosaccharides/oligogalacturonides of about 1:1. Spent solids were washed with water, and the washing liquors were assayed for oligomers. Recovery of washing liquors would increase the overall yield process by 10%, to reach near 33 g/100 g of oven-dried SBP. Washed spent solids (with increased cellulose content) were obtained as a process byproduct. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017753

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