Document Detail

A comparative study of antioxidative activities of cell-wall polysaccharides.
MedLine Citation:
PMID:  21880306     Owner:  NLM     Status:  Publisher    
Oxidative burst in plants is elicited by biotic and abiotic stressors. Analogously to some monosaccharides which act as intracellular antioxidants, cell-wall polysaccharides may be in charge of buffering free-radical production in the extracellular compartment under pronounced prooxidative settings. Although a wide range of plant polysaccharides have been examined for their antioxidative properties, this usually has not been done in a coherent and comparative manner and against biologically relevant reactive species. Here we show that different cell-wall polysaccharides, cellulose, pectin, d-galacto-d-mannan, arabinogalactan, and xylan, exhibit distinctive antioxidative activities against the hydroxyl radical (()OH)-generating Fenton reaction and superoxide. We found, using an EPR spin-trapping method, that the main carriers of 'anti-Fenton' activity in the plant cell wall are pectin and xylan. They most likely act by binding metal ions in such a manner to allow the Fenton reaction, after which they scavenge ()OH. Such a mode of action is preferred by cells resulting in a safe degradation of H(2)O(2). On the other hand, the polysaccharides examined showed similar superoxide scavenging capacities. We propose that plants may employ different antioxidative characteristics of polysaccharides to regulate their redox status by modifying the composition of the cell wall.
Jelena Bogdanović Pristov; Aleksandra Mitrović; Ivan Spasojević
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-24
Journal Detail:
Title:  Carbohydrate research     Volume:  -     ISSN:  1873-426X     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-9-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043535     Medline TA:  Carbohydr Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia.
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