Biological and photochemical degradation rates of diethylenetriaminepentaacetic acid (DTPA) in the presence and absence of Fe(III)

Metsärinne, Sirpa; Rantanen, Päivi; Aksela, Reijo; Tuhkanen, Tuula

doi:10.1016/j.chemosphere.2003.10.062

Cited by 42 publications

(20 citation statements)

References 25 publications

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“…In that case, the chelate was not directly exposed to sunlight and the initial concentration of the EDDHA/Fe 3+ solution was extremely high (80.6 mmol L −1 ), which could have reduced the light penetration through the solution and hence in the photodecomposition of the chelate molecules. The behaviour of EDDHA/Fe 3+ towards light could be in accordance with that previously reported for the very photoreactive EDTA/Fe 3+ and DTPA/Fe 3+ 14, 30, 31. In those cases, a mechanism analogous to that proposed for the photochemistry of Fe(III) oxalate32, 33 and citrate complexes34 has been suggested.…”

Section: Resultssupporting

confidence: 90%

Chiral Pyrimidine Metallacalixarenes: Synthesis, Structure and Host–Guest Chemistry

Barea

Navarro

Salas

et al. 2003

Chemistry A European J

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A set of enantiomerically pure cyclic multinuclear complexes with the formula cis-[a(2)PdL](n) (n+) [a(2)=(R,R)-1,2-diaminocyclohexane (R,R-dach), (S,S)-1,2-diaminocyclohexane (S,S-dach); n=4, 6; LH=2-hydroxypyrimidine (2-Hpymo), 4,6-dimethyl-2-hydroxypyrimidine (2-Hdmpymo) and 4-hydroxypyrimidine (4-Hpymo)] were obtained by reaction of cis-[a(2)Pd(H(2)O)(2)](2+) and LH in aqueous media. The polynuclear complexes were studied by (1)H NMR spectroscopy and X-ray crystallography. These studies revealed that the N1,N3-bridging mode exhibited by the pyrimidine moieties is ideally suited for formation of inorganic analogues of calixarenes (metallacalixarenes) in a self-assembly process. The most stable species are the tetranuclear metallacalix[4]arenes, which are obtained in all cases. Hexanuclear species, namely, [a(2)Pd(2-dmpymo)](6) (6+), were also isolated and fully characterised. (1)H NMR experiments show conversion of [a(2)Pd(2-dmpymo)](6) (6+) to [a(2)Pd(2-dmpymo)](4) (4+) on heating. Analogously to organic calixarenes, these systems are also capable of incorporating hard metal ions at the oxo surface. Additionally, investigations on the receptor properties of these metallacalixarenes towards mononucleotides showed that enantioselective recognition processes occur in aqueous media.

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Section: Resultssupporting

confidence: 90%

Chiral Pyrimidine Metallacalixarenes: Synthesis, Structure and Host–Guest Chemistry

Barea

Navarro

Salas

et al. 2003

Chemistry A European J

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“…Fe(III) complexed with α‐hydroxycarboxylate‐containing siderophores (Barbeau et al. 2003), or complexed with polycarboxylate synthetic chelators, such as EDTA (Šima and Makáňová 1997) or diethylenetriaminepentaaceitc acid (DTPA) (Metsärinne et al. 2004), is prone to photoreduction to Fe(II).…”

Section: Discussionmentioning

confidence: 99%

“…It is well-known that light can induce the reduction of organically bound Fe(III) to Fe(II), which is then available to support algal growth (Finden et al 1984). Fe(III) complexed with a-hydroxycarboxylate-containing siderophores (Barbeau et al 2003), or complexed with polycarboxylate synthetic chelators, such as EDTA (Šima and Makáňová 1997) or diethylenetriaminepentaaceitc acid (DTPA) (Metsärinne et al 2004), is prone to photoreduction to Fe(II). The synthetic chelators used in this work, HEDTA and HBED, contain three and two carboxylate groups, respectively, and likely would also support Fe(III) photoreduction.…”

Section: Discussionmentioning

confidence: 99%

Siderophore-Independent Iron Uptake by Iron-Limited Cells of the Cyanobacterium Anabaena Flos-Aquae1

Wirtz

Treble

Weger

2010

Journal of Phycology

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Iron acquisition by iron-limited cyanobacteria is typically considered to be mediated mainly by siderophores, iron-chelating molecules released by iron-limited cyanobacteria into the environment. In this set of experiments, iron uptake by iron-limited cells of the cyanobacterium Anabaena flos-aquae (L.) Bory was investigated in cells resuspended in siderophore-free medium. Removal of siderophores decreased iron-uptake rates by 60% compared to siderophore-replete conditions; however, substantial rates of iron uptake remained. In the absence of siderophores, Fe(III) uptake was much more rapid from a weaker synthetic chelator [N-(2-hydroxyethyl) ethylenediamine-N,N¢,N¢-triacetic acid (HEDTA); log K cond = 28.64 for Fe(III)HEDTA(OH) ) ] than from a very strong chelator [N,N¢-bis(2-hydroxybenzyl)-ethylenediamine-N,N¢-diacetic acid (HBED); log K cond = 31.40 for Fe(III)HBED ) ], and increasing chelator:Fe(III) ratios decreased the Fe(III)-uptake rate; these results were evident in both short-term (4 h; absence of siderophores) and long-term (116 h; presence of siderophores) experiments. However, free (nonchelated) Fe(III) provided the most rapid iron uptake in siderophore-free conditions. The results of the short-term experiments are consistent with an Fe(III)-binding ⁄ uptake mechanism associated with the cyanobacterial outer membrane that operates independently of extracellular siderophores. Iron uptake was inhibited by temperature-shock treatments of the cells and by metabolically compromising the cells with diphenyleneiodonium; this finding indicates that the process is dependent on active metabolism to operate and is not simply a passive Fe(III)-binding mechanism. Overall, these results point to an important, siderophore-independent iron-acquisition mechanism by iron-limited cyanobacterial cells.

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“…The recent study on the DTPA degradation confirmed its persistence toward biodegradation and effectiveness of the photocatalytic Fe(III)-DTPA cycle for DTPA photodegradation [69].…”

Section: Cycles Based On Direct Photoreactionsmentioning

confidence: 92%

Homogeneous photocatalysis by transition metal complexes in the environment

Cieśla

Kocot

Mytych

et al. 2004

Journal of Molecular Catalysis A: Chemical

223

116

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Biological and photochemical degradation rates of diethylenetriaminepentaacetic acid (DTPA) in the presence and absence of Fe(III)

Cited by 42 publications

References 25 publications

Chiral Pyrimidine Metallacalixarenes: Synthesis, Structure and Host–Guest Chemistry

Chiral Pyrimidine Metallacalixarenes: Synthesis, Structure and Host–Guest Chemistry

Siderophore-Independent Iron Uptake by Iron-Limited Cells of the Cyanobacterium Anabaena Flos-Aquae1

Homogeneous photocatalysis by transition metal complexes in the environment

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