Preparation and properties of Fe(III)sugar complexes

Tonković, Maja; Hadžija, O.; Nagy-Czakó, I.

doi:10.1016/s0020-1693(00)91291-x

Cited by 31 publications

(10 citation statements)

References 10 publications

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“…The molecular weight distribution over 5000 Da for Fe 3+ :G7 complexes at different molar ratios (Fig. f) is in agreement with the molecular weights of Fe 3+ :sugars previously reported, analyzed by GFC on Sephadex® G‐25 and G‐100. Silva et al .…”

Section: Discussionsupporting

confidence: 90%

“…Bands at 2943–2893 cm −1 were also associated with C‐H stretching vibration and the vibrations of Fe‐O were presented in the region 1000–600 cm −1 . A weak band was also presented by Fe 3+ :G7 (1:2) at 1778 cm −1 , which indicated the dissociation of the carboxylic group involved in the Fe complexation.…”

Section: Resultsmentioning

confidence: 99%

“…These effects have been observed for several different kinds of complexes. For instance, Fe 3+ forms very stable complexes in solution with ligands such as sugars and citrate due to the formation of polymers, preventing the precipitation of the Fe(III)‐hydroxy‐polymer . Studies conducted by Silva et al ., with Fe citrate complexes, demonstrated that at pH 9, a mononuclear Fe complex is predominant, with a low Fe 3+ :citrate molar ratio, whereas a high Fe 3+ :citrate molar ratio at a neutral pH leads to the formation of oligomeric complexes.…”

Section: Introductionmentioning

confidence: 99%

“…Gel filtration chromatography (GFC) on Sephadex® has also proven to be a useful tool for the characterization of metal complexes and metal chelates. The GFC permits fractionation based on size, and also the identification of the free and complexed metal by comparison of the retention time with the quantification of the soluble Fe in the fractions obtained . With this technique, the presence of polynuclear compounds in Fe 3+ :G6 (1:1) complexes, and low molecular compounds in Fe 2+ :G6 (1:2) could be determined.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fe:ligand ratios on hydroponic conditions and calcareous soil in Solanum lycopersicum L. and Glycine max L. fertilized with heptagluconate and gluconate

et al. 2019

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BACKGROUND: The environmental risk from the application of synthetic chelates has led to the use of biodegradable complexes to correct Fe deficiency in plants. In this article, the Fe oxidation state, the Fe:ligand ratio, and the molecular weight distribution for heptagluconate (G7) and gluconate (G6) are considered as key factors for the efficacy of complexes as fertilizers. Complexes with different Fe:ligand ratios were prepared and analyzed by gel filtration chromatography (GFC). The ability of Fe:ligand ratios to provide Fe to tomato in hydroponics and soybean in calcareous soil was tested and compared with synthetic chelates (Fe 3+ :HBED and Fe 3+ :EDTA). RESULTS: G7 presented greater capacity to complex both Fe(II) and Fe(III) than G6, but the Fe(II) complexes exhibited poor stability at pH 9 and oxidation in solution.Gel filtration chromatography demonstrated the polynuclear nature of the Fe 3+ :G7 at various ratios. The effectiveness of the Fe fertilizers depend on the Fe 3+ :ligand ratio and the ligand type, the Fe 3+ :G7 (1:1 and 1:2) being the most effective. Fe 3+ :G7 (1:1) also presented a better response for the uptake of other micronutrients. CONCLUSION: Fe 3+ :G7 molar ratios have been shown to be critical for plant Fe uptake under hydroponic conditions and with calcareous soil. Thus, the Fe 3+ :G7 at equimolar ratio and 1:2 molar ratio can be an environmentally friendly alternative to less degradable synthetic chelates to correct Fe chlorosis in strategy I plants.

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Section: Discussionsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Fe:ligand ratios on hydroponic conditions and calcareous soil in Solanum lycopersicum L. and Glycine max L. fertilized with heptagluconate and gluconate

et al. 2019

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“…However, there is a vanishingly small concentration of pyrophosphate in the cell and no evidence that sequestered sites with higher concentrations exist (Weaver & Pollock 1989). Other compounds which have been postulated as ligands for iron include amino acids, polypeptides, certain sugars and uncharacterized growth factors (Gessa et al 1983, Tonkovic et al 1983, Bakkeren et al 1985, Wolowiec & Drabent 1985, Andersson & Porath 1986, Inoue et al 1987). The weakness of these studies is that corresponding complexes either have not been isolated from biological sources or have not been identified as part of the mobile, low molecular mass iron pool.…”

Section: R Bohnke and B F Matzankementioning

confidence: 99%

The mobile ferrous iron pool in Escherichia coli is bound to a phosphorylated sugar derivative

Böhnke

Matzanke

1995

Biometals

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Based on in vivo Mössbauer spectroscopy it has previously been demonstrated that the intracellular iron pool of Escherichia coli, grown in iron deficient media supplemented with siderophores as the sole iron source, is dominated by a single Fe2+ and a single Fe3+ species. We have isolated the ferrous ion species and have purified it employing native column PAGE, chromatography and ultrafiltration. The purified compound displays an Mapp of 2.2 kDa and an extremely low isoelectric point (pI) of 1.05. It is shown that this ferrous ion binding compound is neither a protein nor a nucleotide, rather it is composed mainly of phosphorylated sugar derivatives. This compound binds approximately 40% of the cytoplasmic iron. Therefore it is proposed that this oligomeric ferrous carbohydrate phosphate represents the long sought after mobile, low molecular mass iron pool.

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