Redox interactions between structurally different alkylresorcinols and iron(III) in aqueous media: frozen-solution 57Fe Mössbauer spectroscopic studies, redox kinetics and quantum chemical evaluation of the alkylresorcinol reactivities

Kamnev, Alexander A.; Dykman, R. L.; Kovács, Krisztina; Pankratov, A. N.; Tugarova, Anna V.; Homonnay, Z.; Кузманн, Э.

doi:10.1007/s11224-013-0367-1

Cited by 17 publications

(17 citation statements)

References 39 publications

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“…The powdering of the samples was performed right before the FTIR (and Mössbauer) measurements, before which the pastes were stored in closed bottles at 21 ± 1 • C. The FTIR spectra shown in the plots in the results section are rescaled in the y-axis to show the same maximum absorbance of the Si-O stretching band. 57 Fe Mössbauer spectroscopy measurements were performed to investigate the evolution of the state and environment of the Fe atoms during reaction. Gamma rays were emitted from a source using the decay of 57 Co in Rh matrix kept at room temperature.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

“…The aforementioned oxidation was experimentally observed using 57 Fe Mössbauer spectroscopy (Lemougna et al, 2013;Onisei et al, 2018). In these works the success in providing information for the oxidation state of iron (Fe 3+ ) in the IP binder, did not expand to the level of the exact description of the coordination of iron (Lemougna et al, 2013;Onisei et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…In the present work, the reaction mechanism of Fe-silicate IPs is clarified with respect to the behavior of Fe in the first 28 days after mixing. A combination of 57 Fe Mössbauer spectroscopy and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy is performed ex-situ to provide details on the evolution of the local environment of Fe and the connectivity of the silicate network throughout the reaction. These observations are combined to provide new information on our binder system, such as the timing of oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

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Inorganic Polymers From CaO-FeOx-SiO2 Slag: The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder

et al. 2019

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Belonging to the family of alternative cementitious materials, inorganic polymers are rising in importance because of the drive to decrease CO 2 emissions of concrete production. A synthetic Fe-rich slag resembling industrial copper or lead slags, was mixed with a sodium silicate activating solution. 57 Fe Mössbauer spectra analyses indicate that the oxidation reactions are taking place simultaneously with the polymerization reactions. The slag contains Fe 2+ states and a small amount of Fe 3+. During polymerization a new octahedral Fe 2+ state is formed, while oxidation is manifested through the appearance of an additional Fe 3+ state. The reactions continue after setting, lowering the relative contributions of the slag in the Mössbauer and FTIR spectra of the samples. The Na + /Fe 3+ molar ratio in the mixture that makes up the binder after 28 days is ∼1, suggesting the participation of tetrahedral Fe 3+ in the silicate framework, charge balanced by Na + .

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Section: Experimental Methods and Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inorganic Polymers From CaO-FeOx-SiO2 Slag: The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder

et al. 2019

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“…3 Bioluminescent intensity, I rel , at different HS concentrations, C HS . 1 bacterial assay, 2 enzymatic assay (Tarasova et al 2012) prone to redox transformations in soils and aquifers, especially at low pH in the presence of iron(III) (Kamnev et al, 2014). Figure 4 illustrates the reversible redox transformation of quinone to hydroquinone (phenol).…”

Section: Detoxification Of Oxidizer Solutionsmentioning

confidence: 99%

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Kudryasheva

Tarasova

2014

Environ Sci Pollut Res

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The paper considers mechanisms of detoxification of pollutant solutions by water-soluble humic substances (HSs), natural detoxifying agents. The problems and perspectives of bioassay application for toxicity monitoring of complex solutions are discussed from ecological point of view. Bioluminescence assays based on marine bacteria and their enzymes are of special attention here; they were shown to be convenient tools to study the detoxifying effects on cellular and biochemical levels. The advantages of bioluminescent enzymatic assay for monitoring both integral and oxidative toxicities in complex solutions of model pollutants and HS were demonstrated. The efficiencies of detoxification of the solutions of organic oxidizers and salts of metals (including radioactive ones) by HS were analyzed. The dependencies of detoxification efficiency on time of exposure to HS and HS concentrations were demonstrated. Antioxidant properties of HS were considered in detail. The detoxifying effects of HS were shown to be complex and regarded as 'external' (binding and redox processes in solutions outside the organisms) and/or 'internal' organismal processes. The paper demonstrates that the HS can stimulate a protective response of bacterial cells as a result of (1) changes of rates of biochemical reactions and (2) stabilization of mucous layers outside the cell walls. Acceleration of auto-oxidation of NADH, endogenous reducer, by HS was suggested as a reason for toxicity increase in the presence of HS due to abatement of reduction ability of intracellular media.

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“…The biological activity of a series of fullerenols C 60 (OH) [12][13][14] , C 60 (OH) [18][19][20][21][22][23][24] , C 60 (OH) [30][31][32][33][34][35][36][37][38] was studied by Eropkin and coworkers (3). Fullerenols C 60 (OH) [18][19][20][21][22][23][24] have revealed maximal biological activity (4,7,8).…”

Section: Introductionmentioning

confidence: 99%

Bioluminescent Enzymatic Assay as a Tool for Studying Antioxidant Activity and Toxicity of Bioactive Compounds

Kudryasheva

Kovel

Sachkova

et al. 2016

Photochem & Photobiology

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A bioluminescent assay based on a system of coupled enzymatic reactions catalyzed by bacterial luciferase and NADH: FMN-oxidoreductase was developed to monitor toxicity and antioxidant activity of bioactive compounds. The assay enables studying toxic effects at the level of biomolecules and physicochemical processes, as well as determining the toxicity of general and oxidative types. Toxic and detoxifying effects of bioactive compounds were studied. Fullerenols, perspective pharmaceutical agents, nanosized particles, water-soluble polyhydroxylated fullerene-60 derivatives were chosen as bioactive compounds. Two homologous fullerenols with different number and type of substituents, C 60 O 2-4 (OH) [20][21][22][23][24] and Fe 0.5 C 60 (OH) x O y (x + y = 40-42), were used. They suppressed bioluminescent intensity at concentrations >0.01 g L À1 and >0.001 g L À1 for C 60 O 2-4 (OH) 20-24 and Fe 0.5 C 60 (OH) x O y , respectively; hence, a lower toxicity of C 60 O 2-4 (OH) 20-24 was demonstrated. Antioxidant activity of fullerenols was studied in model solutions of organic and inorganic oxidizers; changes in toxicities of general and oxidative type were determined; detoxification coefficients were calculated. Fullerenol C 60 O 2-4 (OH) 20-24 revealed higher antioxidant ability at concentrations 10 À17 À10 À5 g L À1 . The difference in the toxicity and antioxidant activity of fullerenols was explained through their electron donor/acceptor properties and different catalytic activity. Principles of bioluminescent enzyme assay application for evaluating the toxic effect and antioxidant activity of bioactive compounds were summarized.

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Redox interactions between structurally different alkylresorcinols and iron(III) in aqueous media: frozen-solution 57Fe Mössbauer spectroscopic studies, redox kinetics and quantum chemical evaluation of the alkylresorcinol reactivities

Cited by 17 publications

References 39 publications

Inorganic Polymers From CaO-FeOx-SiO2 Slag: The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder

Inorganic Polymers From CaO-FeOx-SiO2 Slag: The Start of Oxidation of Fe and the Formation of a Mixed Valence Binder

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Bioluminescent Enzymatic Assay as a Tool for Studying Antioxidant Activity and Toxicity of Bioactive Compounds

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