The role of early stages of dioxygen activation in the biological and catalytic activity of phenol-type natural antioxidants

Ревина, А. А.; Zaitsev, P. M.

doi:10.1134/s1023193512030111

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…5b) the adsorption spectrum of the reducing agent Qr is absent, but in the same time is observed the growth of the adsorption intensity of NP Ag. The experimental results [14,15] At the optical density registration of the metal NP adsorption bands on dependence on time (the results were obtained for the various primary stages of the Me n+ reduction reactions), there arises the question about different mechanisms of the early stages of the reduction reactions) and also the question of the "post-formation" process of metal NPs establishment and the reactions of this process during long period. An post-formation process during a "post-radiaion" was detected for NP RadChem of different metals (Pd, Pt, Au, Rh, Re, and Fe [18,19,21].…”

Section: Physico-chemical Studies Of Reverse Micellar Solutionsmentioning

confidence: 99%

“…When using the nano-size particles (NP) synthesis the such reverse micelles fabrication (as the some specific micro-reactors) fabrications have demonstrated the sufficient advantages of this method, that allows us to obtain the stable nanostructural particles with the various metals and bimetals (including the rare-earth ones) with given sizes both in the liquid phase and in adsorbed state, properties and the different, earlier inaccessible poly-functional activity with the bactericide, anticorrosion, catalytic, adsorptive activity [13,14]. But for the successive development and practical application of these results that is necessary to carry out many fundamental investigations of the method physical and chemical process kinetics (especially in fields of the NP synthesis and control), as well as the studies of the different water characteristics (optical, electro-dynamical, relaxation, etc) in the mentioned reverse micelle pools.…”

Section: Introductionmentioning

confidence: 99%

“…The deep studies of the electromagnetic, electro-physical, optical, etc properties of the water into the aqueous-organic reverse micelle solutions, carried out by professor V.I. Ermakov investigations, allowed to select from the complex system of the experimental data information of the state and properties of water into the micelles [14,19,20].…”

Section: Introductionmentioning

confidence: 99%

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Water in Reverse Micelles

Ревина¹

2020

RENSIT

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Section: Physico-chemical Studies Of Reverse Micellar Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water in Reverse Micelles

Ревина¹

2020

RENSIT

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“…This work provides the results of studies of 1-hydroxylates-german carboxylates and German complexes with lemon (citrate 1-hydroxyermatran C 6 H 13 GeNO 4 •C 6 H 8 O 7 -"Eniogerm") and pyrovinaric acids (Pyruvat 1-Hydroxyermatrane C 6 H 13 GeNO 4 •C 3 H 4 O 3 ): SPU German: 1). Germranol (Germatranol)-2-[bis (2-hydroxyethyl) amino] ethanol; Germane Hydrate, C 6 H 1 3 GeNO 4 [9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, and Biological Activity of the Germanium Dioxide Complex Compound with 2-Amino-3-Hydroxybutanoic Acid

Kadomtseva,

Mochalov,

Zasovskaya

et al. 2024

Inorganics

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Currently, a promising direction of study is the use of biologically active coordination compounds in the pharmacopoeia and the creation of effective bactericidal drugs, biomaterials, and enzyme modulators on that basis. The paper considers a coordination germanium compound with 2-amino-3-hydroxybutanoic acid. The prospects for the use of the compound in medicine are outlined. This work is aimed at solving the problems regarding the synthesis of biologically active compounds with a wide spectrum of actions. The structure and composition of the coordination compound have been established through calculation and experimental methods. The biocidal (bactericidal and fungicidal) activity of germanium-containing compounds against a number of bacteria and microscopic fungi has been studied. Using the quantum-chemical method with density functional theory (DFT, B3LYP/6–311++G(2d,2p)), the theoretical IR spectrum of the compound was calculated. The structure of the coordination compound and the structure of the intermediates at all stages of the synthesis process were established by calculation.

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“…The catalytic activity of sil ver containing catalysts in this reaction is caused by the formation, on the silver particle surface, of highly active oxygen incorporated in the surface oxide [5][6][7]. It is known that the presence of hydroxyl ions in the reaction medium facilitates the rupture of the C-H bond and promotes methanal oxidation with oxygen [8][9][10].…”

mentioning

confidence: 99%

Catalytic activity of silver–ion exchanger nanocomposites in methanal oxidation reaction with molecular oxygen

et al. 2015

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oxides; aluminum; mesoporous mesostructured silicates MCM 41 and SBA 15 and NaY zeolites-are widely used as catalysts of the methanal (formaldehyde) oxi dation with oxygen [1][2][3][4]. The catalytic activity of sil ver containing catalysts in this reaction is caused by the formation, on the silver particle surface, of highly active oxygen incorporated in the surface oxide [5][6][7]. It is known that the presence of hydroxyl ions in the reaction medium facilitates the rupture of the C-H bond and promotes methanal oxidation with oxygen [8][9][10]. Nevertheless, high conversions of methanal are observed only at elevated temperatures. Owing to the surface location of active silver sites and the high concentration of ОН -ions in the matrix, silver-anion exchanger composites are promising catalytic materi als of methanal oxidation with oxygen.The aims of this work are to synthesize silver con taining nanocomposites based on various highly basic anion exchangers and to study their catalytic activity in the oxidation of methanal dissolved in water with oxygen.For synthesis of silver containing composites, we used granular 3D cross linked highly basic anion exchange resins (in the Cl -form) AH 17 8 and AH 17 2P (Azot, Ukraine) and Lewatit M 500 and Lewatit MP 500 (Lanxess, Germany) with a gel and porous structure and, for comparison, sulfonated cation exchange resin (in the Na + form) KU 2 8 (Azot, Ukraine). Matrix grains were 0.8-1.0 mm in size.After acid-base conditioning to constant total exchange capacity, silver was chemically deposited into ion exchangers by adding successively silver nitrate and a reductant (NaBH 4 + NaOH) under dynamic conditions. In catalytic experiments, com posites with the active oxygen surface layer were used. To generate such a layer, oxygenated water was passed through the layer of the prepared composite.The composite morphology and the phase compo sition of the deposited particles were characterized on the basis of X ray powder diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X ray analysis (EDX) data. The prepared composites had mainly a surface distribution of silver particles (Fig. 1). Basic characteristics of the composites are summarized in Table 1.The catalytic activity of the synthesized composites was studied for the reaction of oxidation of methanal dissolved in water at 23 ± 2°C. The methanal concen tration was 30 ± 3 mmol/L. To elucidate the effect of ОН -ions on the catalytic activity of composites, the methanal oxidation was also carried out in a 0.1 M alkaline solution. The composite volume to methanal solution volume ratio was 1 : 10. The solution was con tinuously stirred by bubbling oxygen or argon through it. The reaction course was monitored by measuring changes in concentration: the oxygen concentration was determined by a gasometric method [11], and the methanal concentration was determined by titrimetric and photocolorimetric methods [12,13]. From the PHYSICAL CHEMISTRY Abstract-Silver containing ion exchangers with the surface distributio...

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The role of early stages of dioxygen activation in the biological and catalytic activity of phenol-type natural antioxidants

Cited by 8 publications

References 4 publications

Water in Reverse Micelles

Water in Reverse Micelles

Synthesis, Structure, and Biological Activity of the Germanium Dioxide Complex Compound with 2-Amino-3-Hydroxybutanoic Acid

Catalytic activity of silver–ion exchanger nanocomposites in methanal oxidation reaction with molecular oxygen

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