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

Carbohydr Polym. 2016 May 20;142:45-50. doi: 10.1016/j.carbpol.2016.01.025. Epub 2016 Jan 14.

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.

Keywords: Depolymerization; Oxidation; Periodate; Xylan.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aldehydes / chemistry*
  • Oxidants / chemistry
  • Oxidation-Reduction
  • Periodic Acid / chemistry*
  • Polymerization
  • Xylans / chemistry*

Substances

  • Aldehydes
  • Oxidants
  • Xylans
  • Periodic Acid
  • 4-O-methyl glucuronoxylan
  • metaperiodate