Different binding modes of Cu and Pb vs. Cd, Ni, and Zn with the trihydroxamate siderophore desferrioxamine B at seawater ionic strength

Schijf, Johan; Christenson, Emily A.; Potter, Kailee J.

doi:10.1016/j.marchem.2015.02.014

Cited by 21 publications

(29 citation statements)

References 97 publications

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“…They concluded that, with respect to the YREEs, MSA − is an 8-13 orders of magnitude weaker ligand than DFOB and thus of no consequence. Assuming, for lack of evidence to the contrary, that the stabilities of MSA and sulfate complexes are broadly interchangeable, Schijf et al (2015) drew the same conclusion in a study of DFOB complexation with Cu, Ni, Zn, Cd, and Pb.…”

Section: Stability Constants Of Mg−msa and Ca−msa Complexesmentioning

confidence: 91%

“…Detailed descriptions of potentiometric titration and non-linear regression protocols are given in Christenson and Schijf (2011) and Schijf et al (2015). The Brinkmann Metrohm 809 Titrando autotitrator is operated by Tiamo v.1.2.1 software.…”

Section: Potentiometric Titrations and Non-linear Regressionsmentioning

confidence: 99%

“…Using this value, metal+HAH titrations were Christenson and Schijf (2011), to determine equilibrium constants of Mg−DFOB and Ca−DFOB complexes, R j , which are expressed in terms of the species H 3 L (where L 3− is the fully deprotonated ligand) and incorporate proton exchange ( Table 1). These were converted with the pK ai to stability constants of the form L β j ( Table 1) that do not incorporate proton exchange (Schijf et al, 2015).…”

Section: Potentiometric Titrations and Non-linear Regressionsmentioning

confidence: 99%

“…Siderophores like desferrioxamine B (DFOB), albeit highly specific for Fe(III), can bind many metals with great affinity (Kruft et al, 2013). Schijf et al (2015) recently measured stability constants of metal-DFOB complexes in 0.7 M NaClO 4 and found them to be similar to published conditional stability constants of complexes with marine organic ligands for Cu, Zn, and Pb, yet orders of magnitude smaller for Ni and Cd. It has indeed been suggested that natural Cd-specific ligands contain sulfurbearing groups (Bruland, 1992;Baars et al, 2014) and do not resemble siderophores.…”

Section: Introductionmentioning

confidence: 98%

“…While the authors provide no details of the calculation, their SRC is ostensibly expressed in terms of fully deprotonated DFOB, a species that is virtually nonexistent in seawater and does not form any complex with most metals. They moreover used data of Farkas et al (1999), whose regression model does incorporate a spurious complex with the fully deprotonated ligand, probably accounting for the fact that no stability constants were reported for the bidentate Mg-DFOB and Ca-DFOB complex (see the discussion in Schijf et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Side-Reaction Coefficient of Desferrioxamine B in Trace-Metal-Free Seawater

Schijf

Burns

2016

Front. Mar. Sci.

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Electrochemical techniques like adsorptive cathodic stripping voltammetry with competitive ligand equilibration (ACSV-CLE) can determine total concentrations of marine organic ligands and their conditional binding constants for specific metals, but cannot identify them. Individual organic ligands, isolated from microbial cultures or biosynthesized through genomics, can be structurally characterized via NMR and tandem MS analysis, but this is tedious and time-consuming. A complementary approach is to compare known properties of natural ligands, particularly their conditional binding constants, with those of model organic ligands, measured under suitable conditions. Such comparisons cannot be meaningfully interpreted unless the side-reaction coefficient (SRC) of the model ligand in seawater is thoroughly evaluated. We conducted series of potentiometric titrations, in non-coordinating medium at seawater ionic strength (0.7 M NaClO 4 ) over a range of metal:ligand molar ratios, to study complexation of the siderophore desferrioxamine B (DFOB) with Mg and Ca, for which it has the highest affinity among the major seasalt cations. From similar titrations of acetohydroxamic acid in the absence and presence of methanesulfonate (mesylate), it was determined that Mg and Ca binding to this common DFOB counter-ion is not strong enough to interfere with the DFOB titrations. Stability constants were measured for all DFOB complexes with Mg and Ca including, for the first time, the bidentate complexes. No evidence was found for Mg and Ca coordination with the DFOB terminal amine. From the improved DFOB speciation, we calculated five SRCs for each of the five (de)protonated forms of DFOB in trace-metal-free seawater, yet we also present a more convenient definition of a single SRC that allows adjustment of all DFOB stability constants to seawater conditions, no matter which of these forms is selected as the "component" (reference species). An example of Cd speciation in seawater containing DFOB illustrates the non-trivial use of different SRCs for polyprotic, polydentate organic ligands.

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Section: Stability Constants Of Mg−msa and Ca−msa Complexesmentioning

confidence: 91%

Section: Potentiometric Titrations and Non-linear Regressionsmentioning

confidence: 99%

Section: Potentiometric Titrations and Non-linear Regressionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of the Side-Reaction Coefficient of Desferrioxamine B in Trace-Metal-Free Seawater

Schijf

Burns

2016

Front. Mar. Sci.

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Assignment of complex species by affinity capillary electrophoresis: The case of Th(IV)‐desferrioxamine B

2020

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The electrophoretic mobility change of desferrioxamine B (DFO) was monitored by UV absorption spectrophotometry upon increasing the thorium(IV) concentration in the background electrolyte at two acidities ([HClO4]Tot = 0.0316 and 0.0100 M). These data enabled to assess the speciation model and to determine the equilibrium constant of [Th(DFO)H2]3+ at fixed ionic strength (I = 0.1 M (H,Na)ClO4). Affinity capillary electrophoresis (ACE) turned out to be most helpful in identifying the complexed species by ascertaining its charge and protonation state. The assignment of the correct stoichiometry relied on the reliable estimation of the electrophoretic mobility by assuming similar hydrodynamic radii for (DFO)H4+ and the chelate. The value of the apparent equilibrium constant (log β112 = 38.7 ± 0.4) obtained by ACE compares favorably well with those reported in the literature for thorium and a range of other metal ions, according to a linear free‐energy relationship. This method is useful for studying metal‐ligand binding equilibria and provides valuable information for further modelling the behavior of tetravalent actinides under environmental conditions. Structural information about the prevalent solution species in acidic conditions was gained by DFT calculations, confirming the bishydroxamato coordination mode of Th4+ by the diprotonated ligand.

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Modified chrome azurol S method for detection and estimation of siderophores having affinity for metal ions other than iron

Patel

Shaikh

Sayyed

2018

Environmental Sustainability

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Siderophores are small molecular weight (generally 1 kDa) ferric specific ligands produced by variety of organisms to chelate iron under iron limiting conditions. Various assays have been in use to detect and estimate different phenotypes of siderophores. Though there are various methods available for detection of iron specific siderophore or modified method for Cu specific siderophore [chalkophore], reports on modified methods for detection of siderophore having affinity for various other metal ions are scarce. In present study, a modified method was designed for screening siderophores that can bind to heavy metal ions such as Cu 2+

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Different binding modes of Cu and Pb vs. Cd, Ni, and Zn with the trihydroxamate siderophore desferrioxamine B at seawater ionic strength

Cited by 21 publications

References 97 publications

Determination of the Side-Reaction Coefficient of Desferrioxamine B in Trace-Metal-Free Seawater

Determination of the Side-Reaction Coefficient of Desferrioxamine B in Trace-Metal-Free Seawater

Assignment of complex species by affinity capillary electrophoresis: The case of Th(IV)‐desferrioxamine B

Modified chrome azurol S method for detection and estimation of siderophores having affinity for metal ions other than iron

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