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International Journal of Biological Macromolecules 2014-Sep

Partial structural characterization and antioxidant activity of a phenolic-xylan from Castanea sativa hardwood.

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Emmanuel Renault
Aline Barbat-Rogeon
Vincent Chaleix
Claude-Alain Calliste
Cyril Colas
Vincent Gloaguen

Keywords

Abstract

4-O-Methylglucuronoxylans (MGX) were isolated from chestnut wood sawdust using two different procedures: chlorite delignification followed by the classical alkaline extraction step, and an unusual green chemistry process of delignification using phthalocyanine/H2O2 followed by a simple extraction with hot water. Antioxidant properties of both MGX were evaluated against the stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) by electronic spin resonance (ESR). IC50 of water-extracted MGX was found to be less than 225 μg mL(-1), in contrast with alkali-extracted MGX for which no radical scavenging was observed. Characterization of extracts by colorimetric assay, GC, LC-MS and NMR spectroscopy provided some clues to understanding structure-function relationships of MGX in connection with their antioxidant activity.

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