Evidence for ligand hydrolysis and Fe(III) reduction in the dissolution of goethite by desferrioxamine-B

Simanova, Anna A.; Persson, Per; Loring, John S.

doi:10.1016/j.gca.2010.08.037

Cited by 29 publications

(21 citation statements)

References 56 publications

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“…p K a values of H q DFO, defined in Equation (2), were determined from the titration curves and are summarized in Table 1 . The p K a values obtained in this study showed good agreement with those in the previous report [ 15 , 16 , 17 , 18 , 19 ].

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Section: Resultssupporting

confidence: 92%

Re-Evaluations of Zr-DFO Complex Coordination Chemistry for the Estimation of Radiochemical Yields and Chelator-to-Antibody Ratios of 89Zr Immune-PET Tracers

Imura

Sasaki

et al. 2021

Molecules

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(1) Background: Deferoxamine B (DFO) is the most widely used chelator for labeling of zirconium-89 (89Zr) to monoclonal antibody (mAb). Despite the remarkable developments of the clinical 89Zr-immuno-PET, chemical species and stability constants of the Zr-DFO complexes remain controversial. The aim of this study was to re-evaluate their stability constants by identifying species of Zr-DFO complexes and demonstrate that the stability constants can estimate radiochemical yield (RCY) and chelator-to-antibody ratio (CAR). (2) Methods: Zr-DFO species were determined by UV and ESI-MS spectroscopy. Stability constants and speciation of the Zr-DFO complex were redetermined by potentiometric titration. Complexation inhibition of Zr-DFO by residual impurities was investigated by competition titration. (3) Results: Unknown species, ZrHqDFO2, were successfully detected by nano-ESI-Q-MS analysis. We revealed that a dominant specie under radiolabeling condition (pH 7) was ZrHDFO, and its stability constant (logβ111) was 49.1 ± 0.3. Competition titration revealed that residual oxalate inhibits Zr-DFO complex formation. RCYs in different oxalate concentration (0.1 and 0.04 mol/L) were estimated to be 86% and >99%, which was in good agreement with reported results (87%, 97%). (4) Conclusion: This study succeeded in obtaining accurate stability constants of Zr-DFO complexes and estimating RCY and CAR from accurate stability constants established in this study.

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…”

Section: Resultssupporting

confidence: 92%

Re-Evaluations of Zr-DFO Complex Coordination Chemistry for the Estimation of Radiochemical Yields and Chelator-to-Antibody Ratios of 89Zr Immune-PET Tracers

Imura

Sasaki

et al. 2021

Molecules

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“…In the environment, other fate for siderophores is its abiotic degradation, which may take place through hydrolyses and/or oxidation processes. The siderophores with hydroxamate moieties may suffer hydrolyses and generate hydroxylamine groups; this process is followed by the reduction of Fe(III) to Fe(II) (Simanova et al, 2010). Laboratory studies have shown that hydrolyze products from coprogen (tri-hydroxamate siderophore) were also effective iron-carriers to cucumber and maize plants (Hördt et al, 2000).…”

Section: Siderophoresmentioning

confidence: 99%

Promising bacterial genera for agricultural practices: An insight on plant growth-promoting properties and microbial safety aspects

Ferreira

Soares

2019

Science of The Total Environment

153

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In order to address the ever-increasing problem of the world's population food needs, the optimization of farming crops yield, the combat of iron deficiency in plants (chlorosis) and the elimination/reduction of crop pathogens are of key challenges to solve. Traditional ways of solving these problems are either unpractical on a large scale (e.g. use of manure) or are not environmental friendly (e.g. application of iron-synthetic fertilizers or indiscriminate use of pesticides). Therefore, the search for greener substitutes, such as the application of siderophores of bacterial source or the use of plant-growth promoting bacteria (PGPB), is presented as a very promising alternative to enhance yield of crops and performance. However, the use of microorganisms is not a risk-free solution and the potential biohazards associated with the utilization of bacteria in agriculture should be considered. The present work gives a current overview of the main mechanisms associated with the use of bacteria in the promotion of plant growth. The potentiality of several bacterial genera (Azotobacter, Azospirillum, Bacillus, Pantoea, Pseudomonas and Rhizobium) regarding to siderophore production capacity and other plant growth-promoting properties are presented. In addition, the field performance of these bacteria genera as well as the biosafety aspects related with their use for agricultural proposes are reviewed and discussed.

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“…As such, the total dissolution rate (R T ) is the sum the rate of dissolution from each pathway: 3where reductive dissolution results in concomitant oxidation of the siderophore (Sid ox ) (Duckworth and Sposito, 2005b). We note that it is also possible for surface redox reactions to result in metal reduction, followed by rapid reoxidation and complexation of the dissolved metal (Dhungana et al, 2007;Simanova et al, 2010). Because we only measure the formation of complexes spectrophotometrically in solution, we are unable to distinguish this potential dissolution pathway from ligand-promoted dissolution.…”

Section: Determination Of Dissolution Ratesmentioning

confidence: 99%

Metal oxyhydroxide dissolution as promoted by structurally diverse siderophores and oxalate

Akafia

Harrington

Bargar

et al. 2014

Geochimica et Cosmochimica Acta

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Siderophores, a class of biogenic ligands with high affinities for Fe(III), promote the dissolution of metal ions from sparingly soluble mineral phases. However, most geochemical studies have focused on quantifying the reactivity of DFOB, a model trishydroxamate siderophore. This study utilized three different siderophores, desferrioxamine B, rhizoferrin, and protochelin, with structures that contain the most commonly observed binding moieties of microbial siderophores to examine the siderophore-promoted dissolution rates of FeOOH, CoOOH, and MnOOH in the absence and presence of the ubiquitous low molecular mass organic acid oxalate by utilizing batch dissolution experiments at pH = 5-9. Metal-siderophore complex and total dissolved metal concentrations were monitored for durations of one hour to fourteen days, depending on the metal oxyhydroxide identity and solution pH. The results demonstrate that MnOOH and CoOOH generally dissolve more quickly in the presence of siderophores than FeOOH. Whereas FeOOH dissolved exclusively by a ligand-promoted dissolution mechanism, MnOOH and CoOOH dissolved predominantly by a reductive dissolution mechanism under most experimental conditions. For FeOOH, siderophore-promoted dissolution rates trended with the stability constant of the corresponding aqueous Fe(III) complex. In the presence of oxalate, measured siderophore-promoted dissolution rates were found to increase, decrease, or remain unchanged as compared to the observed rates in single-ligand systems, depending on the pH of the system, the siderophore present, and the identity of the metal oxyhydroxide. Increases in observed dissolution rates in the presence of oxalate were generally greater for FeOOH than for MnOOH or CoOOH. These results elucidate potential dissolution mechanisms of both ferric and non-ferric oxyhydroxide minerals by siderophores in the environment, and may provide further insights into the biological strategies of metal acquisition facilitated by coordinated exudation of low molecular weight organic acids and siderophores.

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Evidence for ligand hydrolysis and Fe(III) reduction in the dissolution of goethite by desferrioxamine-B

Cited by 29 publications

References 56 publications

Re-Evaluations of Zr-DFO Complex Coordination Chemistry for the Estimation of Radiochemical Yields and Chelator-to-Antibody Ratios of 89Zr Immune-PET Tracers

Re-Evaluations of Zr-DFO Complex Coordination Chemistry for the Estimation of Radiochemical Yields and Chelator-to-Antibody Ratios of 89Zr Immune-PET Tracers

Promising bacterial genera for agricultural practices: An insight on plant growth-promoting properties and microbial safety aspects

Metal oxyhydroxide dissolution as promoted by structurally diverse siderophores and oxalate

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