Revision of iron(III)–citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies

Vukosav, Petra; Mlakar, Marina; Tomišić, Vladislav

doi:10.1016/j.aca.2012.07.036

Cited by 49 publications

(31 citation statements)

References 30 publications

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“…14 [20][21][22] Given the ability of citrate to bind to an array of metal cations, ternary or heterometallic species are also likely to form and 1:1:2 U(VI)O 2 2+ :Fe(III):citrate complexes have been observed previously in aqueous systems. 23 Formation of ternary molecular species could impact the long term stability of U(VI)O 2 2+ -bearing mineral due to higher solubility of the resultant phases and several previous studies have reported enhanced mobility and stability in mixed-metal systems.…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of environmentally relevant ternary uranyl citrate complexes present in aqueous solutions and solid state materials

et al. 2015

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Organic acids are important metal chelators in environmental systems and tend to form soluble complexes in aqueous solutions, ultimately influencing the transport and bioavailability of contaminants in surface and subsurface waters. This is particularly true for the formation of uranyl citrate complexes, which have been utilized in advanced photo- and bioremediation strategies for soils contaminated with nuclear materials. Given the complexity of environmental systems, the formation of ternary or heterometallic uranyl species in aqueous solutions are also expected, particularly with Al(iii) and Fe(iii) cations. These ternary forms are reported to be more stable in aqueous solutions, potentially enhancing contaminant mobility and uptake by organisms, but the exact coordination geometries of these soluble molecular complexes have not been elucidated. To provide insight into the nature of these species, we have developed a series of geochemical model compounds ([(UO(2))(2)Al(2)(C(6)H(4)O(7))(4)](6-) (U(2)Al(2)), [(UO(2))(2)Fe(2)(C(6)H(4)O(7))(4)](6-) (U(2)Fe(2)-1) and [(UO(2))(2)Fe(2)(C(6)H(4)O(7))(4)(H(2)O)(2)](6-) (U(2)Fe(2)-2) and [(UO(2))(2)Fe(4)(OH)(4)(C(6)H(4)O(7))(4)](8-) (U(2)Fe(4))) that were characterized by single-crystal X-ray diffraction and vibrational spectroscopy. Mass spectroscopy was then employed to compare the model compounds to species present in aqueous solutions to provide an enhanced understanding of the ternary uranyl citrate complexes that could be relevant in natural systems.

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Section: Introductionmentioning

confidence: 99%

Structural characterization of environmentally relevant ternary uranyl citrate complexes present in aqueous solutions and solid state materials

et al. 2015

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“…Small mass errors and mSigma Fit ™ values endorse the assignments [38]. It should be noted that all metal species detected by ESI-TOFMS do not necessarily present in original solution because there is a possibility that ions which are not relevant to metal complexation in solution are added to metal complex during ESI process [39,40] Fig. 4 shows linear sweep voltammograms (LSVs) of (a) BiEDTA, (b) Te, and (c) BiEDTA-Te electrolyte.…”

Section: Analysis Of Bi 2 Te 3 Nps Formation Mechanismmentioning

confidence: 80%

Green synthesis and formation mechanism of nanostructured Bi2Te3 using ascorbic acid in aqueous solution

Yokoyama

Sato

Muramatsu

et al. 2015

Advanced Powder Technology

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“…Recent studies indicate that the mononuclear iron-citrate complexes are the most abundant at physiological pH values and the most important in natural processes 33 . In particular, the predominant ferric-citrate complex species at physiological pH values are represented by monoiron dicitrate complex and multinuclear species of low nuclearity 26 .…”

Section: Discussionmentioning

confidence: 99%

Structural investigations on orotate phosphoribosyltransferase from Mycobacterium tuberculosis, a key enzyme of the de novo pyrimidine biosynthesis

Donini

Ferraris

Miggiano

et al. 2017

Sci Rep

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The Mycobacterium tuberculosis orotate phosphoribosyltransferase (MtOPRT) catalyses the conversion of α-D-5-phosphoribosyl-1-pyrophosphate (PRPP) and orotate (OA) in pyrophosphate and orotidine 5′-monophosphate (OMP), in presence of Mg2+. This enzyme is the only responsible for the synthesis of orotidine 5′-monophosphate, a key precursor in the de novo pyrimidine biosynthesis pathway, making MtOPRT an attractive drug target for the development of antitubercular agents. We report the crystal structures of MtOPRT in complex with PRPP (2.25 Å resolution), inorganic phosphate (1.90 Å resolution) and the exogenous compound Fe(III) dicitrate (2.40 Å resolution). The overall structure of the mycobacterial enzyme is highly similar to those described for other OPRTases, with the “flexible loop” assuming a well define conformation and making specific contacts with the Fe(III)-dicitrate complex. The structures here reported add to the knowledge of a potential drug target for tuberculosis, and will provide a useful tool for the structure-based drug design of potent enzyme inhibitors.

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Revision of iron(III)–citrate speciation in aqueous solution. Voltammetric and spectrophotometric studies

Cited by 49 publications

References 30 publications

Structural characterization of environmentally relevant ternary uranyl citrate complexes present in aqueous solutions and solid state materials

Structural characterization of environmentally relevant ternary uranyl citrate complexes present in aqueous solutions and solid state materials

Green synthesis and formation mechanism of nanostructured Bi2Te3 using ascorbic acid in aqueous solution

Structural investigations on orotate phosphoribosyltransferase from Mycobacterium tuberculosis, a key enzyme of the de novo pyrimidine biosynthesis

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