| XAS analysis of a nanostructured iron polysaccharide produced anaerobically by a strain of Klebsiella oxytoca. | |
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MedLine Citation:
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PMID: 22585084 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A strain of Klebsiella oxytoca, isolated from acid pyrite-mine drainage, characteristically produces a ferric hydrogel, consisting of branched heptasaccharide repeating units exopolysaccharide (EPS), with metal content of 36 wt%. The high content of iron in the EPS matrix cannot be explained by a simple ferric ion bond to the sugar skeleton. The bio-generated Fe-EPS is investigated by X-ray absorption spectroscopy. Fe K-edge XANES analysis shows that iron is mostly in trivalent form, with a non-negligible amount of Fe(2+) in the structure. The Fe EXAFS results indicate that iron in the sample is in a mineralized form, prevalently in the form of nano-sized particles of iron oxides/hydroxides, most probably a mixture of different nano-crystalline forms. TEM shows that these nanoparticles are located in the interior of the EPS matrix, as in ferritin. The strain produces Fe-EPS to modulate Fe-ions uptake from the cytoplasm to avoid iron toxicity under anaerobic conditions. This microbial material is potentially applicable as iron regulator. |
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Authors:
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Iztok Arčon; Oreste Piccolo; Stefano Paganelli; Franco Baldi |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-5-15 |
Journal Detail:
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Title: Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine Volume: - ISSN: 1572-8773 ISO Abbreviation: - Publication Date: 2012 May |
Date Detail:
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Created Date: 2012-5-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9208478 Medline TA: Biometals Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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University of Nova Gorica, Vipavska 13, 5000, Nova Gorica, Slovenia, iztok.arcon@ung.si. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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