title: Periodate oxidation of 4-O-methylglucuronoxylans: Influence of the reaction conditions.
abstract: This work aims at studying the sodium periodate oxidation of 4-O-methylglucuronoxylans (MGX) in different experimental conditions for a control of the oxidation degree. A series of sodium periodate oxidation reactions were conducted at three NaIO4/xylose molar ratios: 0.05, 0.20 and 1.00. The effects of xylan molar mass, xylan concentration and reaction temperature on the reaction rate have been evaluated by UV/visible spectroscopy at 0.20 NaIO4/xylose ratio. No depolymerization is observed at 0.05 ratio while depolymerization occurs at 0.20 and is even complete at 1.00 NaIO4/xylose ratio. An increase of the reaction temperature - up to 80 °C - leads to an increase of the oxidation rate with no effect on the depolymerization. At high xylan concentrations, the oxidation rate increases but promotes chains aggregation.
authors.affiliation: Centre National de la Recherche Scientifique, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France; University of Bordeaux, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France.
authors.forename: Maud
authors.initials: M
authors.lastname: Chemin
authors.affiliation: Centre National de la Recherche Scientifique, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France; University of Bordeaux, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France.
authors.forename: Alex
authors.initials: A
authors.lastname: Rakotovelo
authors.affiliation: Centre National de la Recherche Scientifique, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France; University of Bordeaux, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France.
authors.forename: Frédérique
authors.initials: F
authors.lastname: Ham-Pichavant
authors.affiliation: ITERG, 11 rue Gaspard Monge, Parc Industriel Bersol 2, F-33600 Pessac Cedex, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Chollet
authors.affiliation: FCBA, InTechFibres Division, Domaine Universitaire, CS9025, F-38044 Grenoble Cedex 9, France.
authors.forename: Denilson
authors.initials: D
authors.lastname: Da Silva Perez
authors.affiliation: FCBA, InTechFibres Division, Domaine Universitaire, CS9025, F-38044 Grenoble Cedex 9, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Petit-Conil
authors.affiliation: Centre National de la Recherche Scientifique, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France; University of Bordeaux, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France.
authors.forename: Henri
authors.initials: H
authors.lastname: Cramail
authors.affiliation: Centre National de la Recherche Scientifique, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France; University of Bordeaux, Laboratoire de Chimie des Polymères Organiques, UMR 5629, IPB/ENSCBP, 16 avenue Pey-Berland, F-33607 Pessac Cedex, France. Electronic address: stephane.grelier@enscbp.fr.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Grelier
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D010504:Periodic Acid / Q000737:chemistry*; D058105:Polymerization; D014990:Xylans / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D016877:Oxidants; D014990:Xylans; D010504:Periodic Acid; C044967:4-O-methyl glucuronoxylan; C009288:metaperiodate
keywords: Depolymerization; Oxidation; Periodate; Xylan