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 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. (C) 2016 Elsevier Ltd. All rights reserved.
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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, Elsevier, 2016, 142, pp.45-50. ⟨10.1016/j.carbpol.2016.01.025⟩. ⟨hal-01373113⟩



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