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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Delattre, C. Pierre, G. Gardarin, C. Traikia, M. Elboutachfaiti, R. Isogai, A. Michaud, P. |
| Description | Author Affiliation: Delattre C ( Clermont Université, Université Blaise Pascal, Institut Pascal, UMR 6602 CNRS Polytech Clermont-Ferrand, 24 avenue des Landais, BP 206, Aubière Cedex F-63174, France. Electronic address: cedric.delattre@univ-bpclermont.fr.); Pierre G ( Clermont Université, Université Blaise Pascal, Institut Pascal, UMR 6602 CNRS Polytech Clermont-Ferrand, 24 avenue des Landais, BP 206, Aubière Cedex F-63174, France.); Gardarin C ( Clermont Université, Université Blaise Pascal, Institut Pascal, UMR 6602 CNRS Polytech Clermont-Ferrand, 24 avenue des Landais, BP 206, Aubière Cedex F-63174, France.); Traikia M ( Clermont Université, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, UMR 6296 CNRS, BP 80026, Aubière Cedex F-63171, France.); Elboutachfaiti R ( Laboratoire des Polysaccharides Microbiens et Végétaux, IUT d'Amiens, Avenue des Facultés, Le Bailly, Amiens Cedex F-80025, France.); Isogai A ( Graduate School of Agricultural and Life Science, Biomaterial Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 133-8657, Japan.); Michaud P ( Clermont Université, Université Blaise Pascal, Institut Pascal, UMR 6602 CNRS Polytech Clermont-Ferrand, 24 avenue des Landais, BP 206, Aubière Cedex F-63174, France.) |
| Abstract | 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, (13)C 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. |
| File Format | HTM / HTML |
| ISSN | 01448617 |
| Volume Number | 116 |
| e-ISSN | 18791344 |
| Journal | Carbohydrate Polymers |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-02-13 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry__semicolon__materials Discipline Science Antioxidants Chemical Synthesis Cyclic N-oxides Chemistry Polysaccharides, Bacterial Polysaccharides Uronic Acids Biphenyl Compounds Bromides Catalysis Oxidation-reduction Picrates Sodium Compounds Sodium Hydroxide Sodium Hypochlorite Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Materials Chemistry Polymers and Plastics |
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