Periodate oxidation of 4-O-methylglucuronoxylans: Influence of the reaction conditions

Maud Chemin (1, 2) , Alex Rakotovelo (1, 2) , Frédérique Ham-Pichavant (1, 2) , Guillaume Chollet (3) , Denilson da Silva Perez (4) , Michel Petit-Conil (4) , Stéphane Grelier (1, 2) , Henri Cramail (1, 2)

1 LCPO - Laboratoire de Chimie des Polymères Organiques
2 Team 2 LCPO : Biopolymers & Bio-sourced Polymers
3 ITERG - Institut des corps gras
4 FCBA - Institut Technologique Forêt Cellulose Bois-construction Ameublement

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 degrees 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.

Mots clés: Xylan; Oxidation; Periodate; Depolymerization; SODIUM ALGINATE; HEMICELLULOSES; XYLAN; BIOPOLYMERS; DERIVATIVES; DEGRADATION; HYDROLYSIS; CELLULOSE; KINETICS; WATER

Domaines: Polymères

Maud Chemin, Alex Rakotovelo, Frédérique Ham-Pichavant, Guillaume Chollet, Denilson da Silva Perez, et al.. Periodate oxidation of 4-O-methylglucuronoxylans: Influence of the reaction conditions. Carbohydrate Polymers, 2016, 142, pp.45-50. ⟨10.1016/j.carbpol.2016.01.025⟩. ⟨hal-01364878⟩