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Kinetic evidence of the maillard reaction in hydrothermal biomass processing / Andrew A. Peterson in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2107–2117 Titre : Kinetic evidence of the maillard reaction in hydrothermal biomass processing : glucose-glycine interactions in high-temperature, high-pressure water Type de document : texte imprimé Auteurs : Andrew A. Peterson, Auteur ; Russell P. Lachance, Auteur ; Jefferson W. Tester, Auteur Année de publication : 2010 Article en page(s) : pp. 2107–2117 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Kinetic  Evidence;  Hydrothermal;  Biomass;  Glucose-glycine Résumé : Kinetic and mechanistic evidence is presented of the occurrence of a Maillard-type reaction under conditions of interest to hydrothermal biomass processing. Glucose−glycine mixtures were reacted at 250 °C and 10 MPa in an excess of water; both glucose and glycine were found to strongly influence the destruction kinetics of the other species and to result in quantitative and qualitative changes, such as strong absorbance at 420 nm and the production of a dark brown appearance and nutty odor, which are characteristic of the Maillard reaction. The presence of glucose always resulted in higher glycine destruction; the presence of glycine resulted in increased or decreased glucose destruction, depending on initial concentrations, which is consistent with results reported in the literature for lower temperature Maillard reactions. Surrogate compounds that contain the same chemical functional groups also resulted in similar trends. As a result of this reaction, the presence of proteins and amino acids in biomass feedstocks can be expected to result in processing difficulties at hydrothermal conditions: these difficulties will include fouling of process equipment, the quenching of desired reaction pathways, and difficulty in achieving separations between aqueous and oil phases produced. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014809 [article] Kinetic evidence of the maillard reaction in hydrothermal biomass processing : glucose-glycine interactions in high-temperature, high-pressure water [texte imprimé] / Andrew A. Peterson, Auteur ; Russell P. Lachance, Auteur ; Jefferson W. Tester, Auteur . - 2010 . - pp. 2107–2117. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2107–2117 Mots-clés : Kinetic  Evidence;  Hydrothermal;  Biomass;  Glucose-glycine Résumé : Kinetic and mechanistic evidence is presented of the occurrence of a Maillard-type reaction under conditions of interest to hydrothermal biomass processing. Glucose−glycine mixtures were reacted at 250 °C and 10 MPa in an excess of water; both glucose and glycine were found to strongly influence the destruction kinetics of the other species and to result in quantitative and qualitative changes, such as strong absorbance at 420 nm and the production of a dark brown appearance and nutty odor, which are characteristic of the Maillard reaction. The presence of glucose always resulted in higher glycine destruction; the presence of glycine resulted in increased or decreased glucose destruction, depending on initial concentrations, which is consistent with results reported in the literature for lower temperature Maillard reactions. Surrogate compounds that contain the same chemical functional groups also resulted in similar trends. As a result of this reaction, the presence of proteins and amino acids in biomass feedstocks can be expected to result in processing difficulties at hydrothermal conditions: these difficulties will include fouling of process equipment, the quenching of desired reaction pathways, and difficulty in achieving separations between aqueous and oil phases produced. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014809

Production of C3 hydrocarbons from biomass via hydrothermal carboxylate reforming / Curt R. Fischer in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4420–4424 Titre : Production of C3 hydrocarbons from biomass via hydrothermal carboxylate reforming Type de document : texte imprimé Auteurs : Curt R. Fischer, Auteur ; Andrew A. Peterson, Auteur ; Jefferson W. Tester, Auteur Année de publication : 2011 Article en page(s) : pp. 4420–4424 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biomass  Hydrothermal  Carboxylate Résumé : We demonstrate a route for the production of C3 hydrocarbons from renewable biomass by the hydrothermal conversion of well-known fermentation end-products. Specifically, the major commercial C3 hydrocarbons, propane and propylene, can be obtained from butyric acid and 3-hydroxybutyrate (3HB) in substantial yields and industrially relevant productivities by hydrothermal decarboxylation. Butyric acid decarboxylates in supercritical water to give propane as the major product at 454 °C and 25 MPa. 3HB undergoes joint dehydration and decarboxylation in subcritical water to yield propylene at 371 °C and 25 MPa with yields of up to 48 mol %. Although catalysts may be found that increase yields and selectivities, these processes were demonstrated without any added heterogeneous catalysts, and have the further advantage of requiring no external H2 source. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1023386 [article] Production of C3 hydrocarbons from biomass via hydrothermal carboxylate reforming [texte imprimé] / Curt R. Fischer, Auteur ; Andrew A. Peterson, Auteur ; Jefferson W. Tester, Auteur . - 2011 . - pp. 4420–4424. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4420–4424 Mots-clés : Biomass  Hydrothermal  Carboxylate Résumé : We demonstrate a route for the production of C3 hydrocarbons from renewable biomass by the hydrothermal conversion of well-known fermentation end-products. Specifically, the major commercial C3 hydrocarbons, propane and propylene, can be obtained from butyric acid and 3-hydroxybutyrate (3HB) in substantial yields and industrially relevant productivities by hydrothermal decarboxylation. Butyric acid decarboxylates in supercritical water to give propane as the major product at 454 °C and 25 MPa. 3HB undergoes joint dehydration and decarboxylation in subcritical water to yield propylene at 371 °C and 25 MPa with yields of up to 48 mol %. Although catalysts may be found that increase yields and selectivities, these processes were demonstrated without any added heterogeneous catalysts, and have the further advantage of requiring no external H2 source. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1023386