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Article Dans Une Revue Carbohydrate Polymers Année : 2015

Antioxidant activities of a polyglucuronic acid sodium salt obtained from TEMPO-mediated oxidation of xanthan.

Cédric Delattre
Guillaume Pierre
Mounir Traïkia
Philippe Michaud
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Résumé

A xanthouronic acid sodium salt called xanthouronan was produced from xanthan by regioselective oxidation with NaOCl/NaBr using 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO) as catalyst. The efficiency of the one pot TEMPO-mediated oxidation was confirmed by HPAEC-PAD, 13C NMR, and FT-IR. The oxidation degree was close to 98% and the mass yield of this new polyglucuronic acid was higher than 90% (w/w). The macromolecular characterization of xanthouronan using SEC-MALLS showed a molecular size reduced by a third due to the oxidation treatment and the degree of polymerization (DP) of the xanthouronan form was about 665. The evaluation of the enzymatic degradation of this C-6 carboxylated xanthan by various polysaccharide hydrolases and one polysaccharide lyase showed its high resistant to biodegradation. The antioxidant activity of xanthouronan was also tested by using the 2,2′-diphenyl-1-picrylhydrazyle (DPPH) and hydroxyl radical procedures. At 1 g/L, xanthouronan presented 75% of the ascorbic acid antioxidant activity.

Domaines

Chimie
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Dates et versions

hal-01206750 , version 1 (29-09-2015)

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Citer

Cédric Delattre, Guillaume Pierre, Christine Gardarin, Mounir Traïkia, Redouan Elboutachfaiti, et al.. Antioxidant activities of a polyglucuronic acid sodium salt obtained from TEMPO-mediated oxidation of xanthan.. Carbohydrate Polymers, 2015, 116, pp.34-41. ⟨10.1016/j.carbpol.2014.04.054⟩. ⟨hal-01206750⟩
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