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Model for degradation of galactoglucomannan in hot water extraction conditions / Juha A. Visuri in Industrial & engineering chemistry research, Vol.51 N° 31 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10338–10344 Titre : Model for degradation of galactoglucomannan in hot water extraction conditions Type de document : texte imprimé Auteurs : Juha A. Visuri, Auteur ; Tao Song, Auteur ; Susanna Kuitunen, Auteur Année de publication : 2012 Article en page(s) : pp. 10338–10344 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hot  water  Modeling Résumé : A kinetic analysis is presented for the homogeneous degradation of galactoglucomannan (GGM) in hot water extraction conditions. In the experiments used for constructing the kinetic model, GGM extracted from spruce wood meal was treated at temperatures from 150 to 170 °C and in buffered pH 3.8―4.2. The hydrolysis of glycosidic bonds in GGM was modeled as a random process which is catalyzed by hydrogen ions. The real hydrogen ion concentration at the reaction temperatures was estimated. The Arrhenius equation was used to describe the temperature dependence of the hydrolysis rate and an activation energy of 102 kj/mol was obtained for the reaction. The presented model predicts accurately the evolution of the molecular weight distribution with lower computational load than other similar models. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234064 [article] Model for degradation of galactoglucomannan in hot water extraction conditions [texte imprimé] / Juha A. Visuri, Auteur ; Tao Song, Auteur ; Susanna Kuitunen, Auteur . - 2012 . - pp. 10338–10344. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10338–10344 Mots-clés : Hot  water  Modeling Résumé : A kinetic analysis is presented for the homogeneous degradation of galactoglucomannan (GGM) in hot water extraction conditions. In the experiments used for constructing the kinetic model, GGM extracted from spruce wood meal was treated at temperatures from 150 to 170 °C and in buffered pH 3.8―4.2. The hydrolysis of glycosidic bonds in GGM was modeled as a random process which is catalyzed by hydrogen ions. The real hydrogen ion concentration at the reaction temperatures was estimated. The Arrhenius equation was used to describe the temperature dependence of the hydrolysis rate and an activation energy of 102 kj/mol was obtained for the reaction. The presented model predicts accurately the evolution of the molecular weight distribution with lower computational load than other similar models. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26234064