Iron(III)‐Complexes Engaged in the Biochemical Processes in Seawater. II. Voltammetry of Fe(III)‐Malate Complexes in Model Aqueous Solution

Vukosav, Petra; Tomišić, Vladislav; Mlakar, Marina

doi:10.1002/elan.200900632

Cited by 17 publications

(5 citation statements)

References 27 publications

(28 reference statements)

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“…Malate is known to form stable complexes with Fe(II) and Fe(III), which prevents Fe(II) and Fe(III) precipitation at circumneutral pH (45,46,54). In our experiment, this was clear from the increase of the dissolved Fe(II) concentration proportionally to the hydrogen concentration in abiotic controls with malate (Fig.…”

Section: Discussionmentioning

confidence: 52%

“…Malate complexes Fe(II), but this does not explain the enhanced Fe(0) corrosion by strain 4t3-1-2LB. Some organic compounds, including malate, are known to form complexes with ferric and ferrous iron (45,46). For this reason, abiotic controls with 20 mM malate or succinate were investigated (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…4B). Malate was likely capable of keeping Fe(II) in solution as long as its concentration was higher than the Fe(II) concentration (46), which explains why dissolved Fe(II) concentrations decreased after day 2 to 6 with strain 4t3-1-2LB growing on Fe(0) and fumarate ( Fig. 2B and 5).…”

Section: Discussionmentioning

confidence: 99%

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A Novel Shewanella Isolate Enhances Corrosion by Using Metallic Iron as the Electron Donor with Fumarate as the Electron Acceptor

Philips

Driessche

Paepe

et al. 2018

Appl Environ Microbiol

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The involvement of spp. in biocorrosion is often attributed to their Fe(III)-reducing properties, but they could also affect corrosion by using metallic iron as an electron donor. Previously, we isolated strain 4t3-1-2LB from an acetogenic community enriched with Fe(0) as the sole electron donor. Here, we investigated its use of Fe(0) as an electron donor with fumarate as an electron acceptor and explored its corrosion-enhancing mechanism. Without Fe(0), strain 4t3-1-2LB fermented fumarate to succinate and CO, as was shown by the reaction stoichiometry and pH. With Fe(0), strain 4t3-1-2LB completely reduced fumarate to succinate and increased the Fe(0) corrosion rate (7.0 ± 0.6)-fold in comparison to that of abiotic controls (based on the succinate-versus-abiotic hydrogen formation rate). Fumarate reduction by strain 4t3-1-2LB was, at least in part, supported by chemical hydrogen formation on Fe(0). Filter-sterilized spent medium increased the hydrogen generation rate only 1.5-fold, and thus extracellular hydrogenase enzymes appear to be insufficient to explain the enhanced corrosion rate. Electrochemical measurements suggested that strain 4t3-1-2LB did not excrete dissolved redox mediators. Exchanging the medium and scanning electron microscopy (SEM) imaging indicated that cells were attached to Fe(0). It is possible that strain 4t3-1-2LB used a direct mechanism to withdraw electrons from Fe(0) or favored chemical hydrogen formation on Fe(0) through maintaining low hydrogen concentrations. In coculture with an strain, strain 4t3-1-2LB did not enhance acetogenesis from Fe(0). This work describes a strong corrosion enhancement by a strain through its use of Fe(0) as an electron donor and provides insights into its corrosion-enhancing mechanism. spp. are frequently found on corroded metal structures. Their role in microbial influenced corrosion has been attributed mainly to their Fe(III)-reducing properties and, therefore, has been studied with the addition of an electron donor (lactate). spp., however, can also use solid electron donors, such as cathodes and potentially Fe(0). In this work, we show that the electron acceptor fumarate supported the use of Fe(0) as the electron donor by strain 4t3-1-2LB, which caused a (7.0 ± 0.6)-fold increase of the corrosion rate. The corrosion-enhancing mechanism likely involved cell surface-associated components in direct contact with the Fe(0) surface or maintenance of low hydrogen levels by attached cells, thereby favoring chemical hydrogen formation by Fe(0). This work sheds new light on the role of spp. in biocorrosion, while the insights into the corrosion-enhancing mechanism contribute to the understanding of extracellular electron uptake processes.

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Section: Discussionmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

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A Novel Shewanella Isolate Enhances Corrosion by Using Metallic Iron as the Electron Donor with Fumarate as the Electron Acceptor

Philips

Driessche

Paepe

et al. 2018

Appl Environ Microbiol

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“…A different structures of lipids (i.e., the formation of vesicles; mono-, bi-and multilayers, etc.) are usually easily characterized by an atomic force microscope (AFM) because of its exceptional resolution and three-dimensional imaging capability [28][29][30]. Therefore, AFM imaging was applied to perceive changes in lipid structure that occur because of the addition of Phen and metal, indicating the formation of mixed-ligand complex(es).…”

Section: Afm Characterization Of Co(ii) Phospholipide Complexesmentioning

confidence: 99%

Study on the Surface Interactions of Co(II) with Phospholipids from the Marine Environment

Bačinić

Vukosav

Kero

et al. 2022

JMSE

Self Cite

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Natural phospholipid (PL)n extract from cultured green algae Dunaliela tertiolecta was used as the main component of cell membranes for studies on the interaction with trace metal Co(II). The phospholipids of the membranes were extracted from other biological components using TiO2-µSPE cartridges selective for the phosphate group according to a completely new protocol. The interaction of Co(II) with natural and standard phospholipids, phosphatidylcholine (PC), phosphatidylethanolamine (PE), and phosphatidylglycerol (PG) are registered only in the presence of the additional chelating ligand 1,10-Phenathroline (Phen). 1,10-Phenathroline, as a model of humic substances in the marine environment, formed a neutral complex with Co(II) by the substitution of water molecules of central metal ions. The interaction of hydrophobic mixed-ligand complexes with phospholipids was enabled by the substitution of the remaining water molecules in the coordination shell of Co(II), which was registered by voltammetric measurements. The Co(II)-Phen-PL complex is reduced from the adsorbed state at −1.65 V by the transfer of two electrons, followed by its irreversible dissociation and desorption, indicating an EC mechanism. The interaction between the mixed-ligand complexes Co(II)-Phen-lipids was confirmed by atomic force microscopy (AFM). AFM images of PL, PL with Phen mixture and PL, Phen with Co(II) showed different 3D structures on the mica surface, indicating changes caused by the interaction between cobalt(II), 1,10-Phenanthroline and phospholipids.

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“…También se han empleado ácidos policarboxílicos con este objetivo ya que son capaces de formar complejos estables con el hierro. Se han obtenido buenos resultados empleando ácido maleico (Vukosav P. et al 2010) y ácido cítrico (Chen Y. et al 2011). Otro de los compuestos empleado en los procesos tipo-Fenton es el quitosano.…”

Section: Procesos Tipo Fentonunclassified

Efecto de distintas especies reactivas generadas fotoquímicamente sobre la eliminación de contaminantes presentes en aguas naturales.

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Iron(III)‐Complexes Engaged in the Biochemical Processes in Seawater. II. Voltammetry of Fe(III)‐Malate Complexes in Model Aqueous Solution

Cited by 17 publications

References 27 publications

A Novel Shewanella Isolate Enhances Corrosion by Using Metallic Iron as the Electron Donor with Fumarate as the Electron Acceptor

A Novel Shewanella Isolate Enhances Corrosion by Using Metallic Iron as the Electron Donor with Fumarate as the Electron Acceptor

Study on the Surface Interactions of Co(II) with Phospholipids from the Marine Environment

Efecto de distintas especies reactivas generadas fotoquímicamente sobre la eliminación de contaminantes presentes en aguas naturales.

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