Chemin Maud, Rakotovelo Alex, Ham-Pichavant Frédérique, Chollet Guillaume, Da Silva Perez Denilson, Petit-Conil Michel, Cramail Henri, Grelier Stéphane
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.
ITERG, 11 rue Gaspard Monge, Parc Industriel Bersol 2, F-33600 Pessac Cedex, France.
Carbohydr Polym. 2016 May 20;142:45-50. doi: 10.1016/j.carbpol.2016.01.025. Epub 2016 Jan 14.
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.
