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Title:An extracellular polymeric substance quickly chelates mercury(II) with N-heterocyclic groups
Authors:Baldi, Franco (Author)
Gallo, Michele (Author)
Daniale, Salvatore (Author)
Battistel, Dario (Author)
Faleri, Claudia (Author)
Kodre, Alojz (Author)
Arčon, Iztok (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:A strain of Klebsiella oxytoca DSM 29614 is grown on sodium citrate in the presence of 50 mg l−1 of Hg as Hg(NO3)2. During growth, the strain produces an extracellular polymeric substance (EPS), constituted by a mixture of proteins and a specific exopolysaccharide. The protein components, derived from the outer membrane of cells, are co-extracted with the extracellular exopolysaccharide using ethanol. The extracted EPS contains 7.5% of Hg (total amount). This indicates that EPS is an excellent material for the biosorption of Hg2+, through chemical complexation with the EPS components. The binding capacity of these species towards Hg2+ is studied by cyclic voltammetry, and Hg L3-edge XANES and EXAFS spectroscopy. The results found indicate that Hg2+ is mainly bound to the nitrogen of the imidazole ring or other N-heterocycle compounds. The hydroxyl moities of sugars and/or the carboxyl groups of two glucuronic acids in the polysaccharide can also play an important role in sequestring Hg2+ ions. However, N-heterocyclic groups of proteins bind Hg2+ faster than hydroxyl and carboxyl groups of the polysaccharide.
Keywords:Klebsiella oxytoca, Biosorption, Proteins, Polysaccharide, Cyclic voltammetry, EXAFS analysis
Year of publishing:2017
Number of pages:10
Numbering:February 2017
COBISS_ID:4706811 Link is opened in a new window
URN:URN:SI:UNG:REP:MUXZ5NMW
DOI:10.1016/j.chemosphere.2017.02.093 Link is opened in a new window
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Record is a part of a journal

Title:Chemosphere
Publisher:Elsevier
ISSN:0045-6535
Year of publishing:2017

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