Stability of YREE complexes with the trihydroxamate siderophore desferrioxamine B at seawater ionic strength

Christenson, Emily A.; Schijf, Johan

doi:10.1016/j.gca.2011.09.022

Cited by 79 publications

(123 citation statements)

References 78 publications

(114 reference statements)

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“…However, they were unable to determine the pK a of HMSA, which they believed to be 1.92 from the NIST database (Martell et al, 2004) but found to be certainly <0.9. Christenson and Schijf (2011) pointed out that the NIST database contains a sign error and that the actual value is −1.92 (Covington and Thompson, 1974), congruent with the observation of Hernlem et al (1996). Because of this extremely low pK a value, metal-MSA complexes do not dissociate within our experimental pH window (∼2-11) and their stability constants cannot be directly determined by potentiometric titration.…”

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

confidence: 81%

“…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%

“…First, titrations of HAH alone were fit to determine its pK a value. 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%

“…The hydroxamic acid groups deprotonate in the pH range 8.5-9.7, while the amine group is predominantly protonated below pH 10.9 (Christenson and Schijf, 2011). The sequential deprotonation of DFOB can be written as…”

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

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 Complexessupporting

confidence: 81%

Section: Potentiometric Titrations and Non-linear Regressionsmentioning

confidence: 99%

Section: Potentiometric Titrations and Non-linear Regressionsmentioning

confidence: 99%

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

confidence: 99%

See 2 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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“…Although the ability of REE to be transported through cellular membranes along Ca 2þ ionic channels has been recognised (Goecke et al, 2015 and references therein), this mechanism is not considered the main process determining the bioaccumulation of REE, Zr and Hf in biological tissues. On the contrary, the uptake of REE, Zr and Hf is determined by the significant affinity of these metal ions towards organic surfaces (Balistrieri et al, 1981;Sholkovitz et al, 1994;Kuss et al, 2001;Censi et al, 2010;Christenson and Schijf, 2011;Luquet, 2012;Bosco-Santos et al, 2017). The uptake of Zr, Hf and REE in S. spallanzanii can be easily favoured by the filtration role of the branchial crown, whereas Zr, Hf and REE scavenging in tube samples could occur by way of the bio-polymeric nature of the mucus, which provides a wide spectrum of available binding sites.…”

Section: Discussionmentioning

confidence: 99%

Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791)

Parisi

Cammarata

et al. 2017

Chemosphere

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Bioleaching of rare earth elements from monazite sand

Brisson

Zhuang

Alvarez‐Cohen

2015

Biotech & Bioengineering

135

109

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Three fungal strains were found to be capable of bioleaching rare earth elements from monazite, a rare earth phosphate mineral, utilizing the monazite as a phosphate source and releasing rare earth cations into solution. These organisms include one known phosphate solubilizing fungus, Aspergillus niger ATCC 1015, as well as two newly isolated fungi: an Aspergillus terreus strain ML3-1 and a Paecilomyces spp. strain WE3-F. Although monazite also contains the radioactive element Thorium, bioleaching by these fungi preferentially solubilized rare earth elements over Thorium, leaving the Thorium in the solid residual. Adjustments in growth media composition improved bioleaching performance measured as rare earth release. Cell-free spent medium generated during growth of A. terreus strain ML3-1 and Paecilomyces spp. strain WE3-F in the presence of monazite leached rare earths to concentrations 1.7-3.8 times those of HCl solutions of comparable pH, indicating that compounds exogenously released by these organisms contribute substantially to leaching. Organic acids released by the organisms included acetic, citric, gluconic, itaconic, oxalic, and succinic acids. Abiotic leaching with laboratory prepared solutions of these acids was not as effective as bioleaching or leaching with cell-free spent medium at releasing rare earths from monazite, indicating that compounds other than the identified organic acids contribute to leaching performance.

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Stability of YREE complexes with the trihydroxamate siderophore desferrioxamine B at seawater ionic strength

Cited by 79 publications

References 78 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

Rare earths, zirconium and hafnium distribution in coastal areas: The example of Sabella spallanzanii (Gmelin, 1791)

Bioleaching of rare earth elements from monazite sand

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