Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2008, No.2
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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2008, No.2
| Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCESPublished by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Number 2, 2008
CONTENTS
INORGANIC CHEMISTRY
Chizhova E. A., Klyndyuk A. I.
The effect of copper and iron heterovalent substitution on properties of LaBaCuFeO5+d. pp. 5--8
Summary: The effect of copper (iron) substitution on the structure, thermo- and electrophysical properties of the layered lanthanum-barium ferrocuprate has been studied. It has been found that substitution in the B-sublattice of LaBaCuFeO5+d led to the increasing of thermal expansion coefficient and charge transport activation energy in the --(Cu,Fe)O2-- layers of the lanthanum-barium ferrocuprate. Electrical conductivity of the samples increased with trivalent copper content increase.
Gomolko L. A, Shulga N. V., Krut'ko N. P.
Composition and physicochemical properties of cobalt lignosulphonate. pp. 9--15
Summary: Chemical composition and physicochemical properties of complex cobalt lignosulphonate have been studied. Relationship between cation electronegativity in cobalt lignosulphonate and its spectral characteristics has been established. It has been found that chemical composition of lignosulphonate depends of its precipitation method.
COLLOIDAL CHEMISTRY
Opanasenko O. N., Zhigalova O. L., Krut'ko N. P., Ovseenko L. V.
Colloidal properties of some cationic surfactant mixtures. pp. 16--20
Summary: The behavior of cationic surfactant mixtures based on alkylimidazopolyamine, alkylamidopolyamine and oxyethylized alkylamidopolyamine was studied. The comparison of behavior of cationic surfactant mixtures makes clear that interaction parameters for solutions of surfactant are negatives, this indicates the presence of strong attraction between surfactants of mixture in mixed micelles and adsorption layers at solution/air interface. The synergistic effects in solutions of surfactants were found at micellization. It is shown, that the presence of interaction between surfactant-components in mixed micelles depends on chemical structure of surfactants, character of hydrophilic groups and steric factor connected with packing of molecules in mixed micelles.
Komarov V. S., Leonenko L. I.
The effect of initial salt solution concentration on the structure of synthesized hydroxides. pp. 21--24
Summary: Sorption of aluminium, magnesium and iron (III) hydroxides prepared from solutions of different concentrations has been studied. It has been shown that sorption capacity and specific surface of samples increase with initial salt solution concentration. Reasons for the change of the sample structure parameters have been considered in terms of change of colloidal particle characteristics, depending on their form and concentration. It has been found that hydroxides obtained from more concentrated solution are more dispersed and have quite loose structure providing greater sorption capacity of the synthesized sample.
Komarov V. S., Mil'vit N. V., Pat'ko A. I.
Activation of carbonate-containing alumosilicates. pp. 25--28
Summary: The method of alkaline activation of high-carbonate tripoli powder is developed allowing usage of a carbonate component as the activating agent. High efficiency of a method is shown at synthesis of porous substances with the developed structural parameters.
ANALYTICAL CHEMISTRY
Zharsky I. M., Orehova S. E., Kurilo I. I., Mazets A. E., Zhukova I. L.
Electrochemical properties of systems based on vanadium compounds. pp. 29--33
Summary: Electrochemical properties of systems based on vanadium compounds in acid solutions containing reducing agents under anodic and cathodic polarization conditions are studied. Correlation between electrolyte composition, formation processes and stability of different vanadium valence forms has been established. Equilibrium constants for disproportionation and re-proportionation reactions in equilibrium systems containing vanadium (III, IV, V) compounds, have been calculated.
Stepanova L. I., Bodrykh T. I., Sobolevsky A. M., Branitsky G. A.
Synthesis of highly dispersed mixed tungsten and molybdenum oxides. pp. 34--41
Summary: It has been shown that variation of the synthesis conditions (especially initial concentration and ratio of molybdenum and tungsten salts in precursor) allows to obtain from aqueous solution mixed molybdenum-tungsten oxides particles with different stoichiometric and phase composition, different shape and sizes.
Luneva N. K., Ivanyutina A. V.
Phosphorus-containing water-organic preparation for cellulose modification. pp. 42--46
Summary: Method for preparation of cellulose esters using phosphoric acid in presence of vinyl acetate dispersion containing 2.5--5.4% wt. of phosphorus and having ion-exchange capasity up to 2.5 mg-eg/mol, has been developed. Esterification products have been studied by chemical, IR and radiographic methods of analysis. It has been shown that thermal decomposition of modified materials proceeds slower, with less intensity, and begins at the temperature lower by 100°C, while the carbon residue yield increases 2.5 times (at 500°C), as compared to initial cellulose. It has been demonstrated that treatment of cellulose containing materials with esterifying composition produces fire-retardant fabrics with high strength characteristics.
ORGANIC CHEMISTRY
Ogeiko N. H., Petrusevich I. I., Lakhvich F. A., Lakhvich O. F.
Synthesis of analogues for Anagasta (Ephestia) kuehniella kairomones, derivatives of 4-hydroxy-2-acylcyclohexane-1,3-diones. pp. 47--51
Summary: Synthesized izoxazoles were treated with lead tetraacetate. Subsequent reduction of izoxazole cycle and hydrolysis of amino- and acetoxygroups leads to compounds, which are 5,5-dimethyl analogues of natural 4-hydroxy-2-acylcyclohexane -1,3-diones.
Cherevin M. S., Gulevich T. G., Zubreichuk Z. P., Yurashevich N. Y., Knizhnikov V. A.
Synthesis of threonylthreonine. pp. 52--55
Summary: Preparative methods for synthesis of threonylthreonine using threonine methyl ester and N-trifluoracetylthreonine have been proposed.
Dikusar E. A., Kozlov N. G., Potkin V. I., Kovganko N. V., Tlegenov R. T.
Synthesis of 1,1'-ferrocenedicarboxylic acid salts with heterocyclic amines. pp. 56--58
Summary: Amine and triphenylphosphine salts of 1,1'-ferrocenedicarboxylic acid have been obtained with preparative yields by reacting 1,1'-ferrocenedicarboxylic acid with heterocyclic amines or triphenylphosphine.
BIOORGANIC CHEMISTRY
Potapovich M. V., Zheldakova T. A., Rubinov D. B., Eryomin A. N.
The effect of tralkoxydim herbicide, its precursors and metabolites on the activity of glucose oxidase from Aspergillus niger. pp. 59--65
Summary:
Kulak T. I., Tkachenko O. V., Rubinova E. B., Kuharskaya T. A., Eroshevskaya L. A., Kalinichenko E. N., Zinchenko A. I.
Preparation of (2'-5')-oligoadenylates using enzymes from Spicaria violacea fungus. pp. 66--69
Summary: Chemical enzymatic method for the preparation of (2'-5')-oligoadenylates using the filtrate of culture liquor of the mycelial fungus Spicaria violacea has been elaborated. The method consists in the enzymatic hydrolysis of (3'-5')-phosphodiester bonds and end phosphate groups of the chemically prepared polyadenylates with randomly distributed (2'-5')- and (3'-5')-bonds by fungal culture liquor containing (3'-5')-specific nuclease and phosphatase.
Cherviakovsky E. M.
The effect of reaction medium composition upon cytochrome c reduction degree by quercetin. pp. 70--75
Summary: Cytochrome c is a protein that can be used for quantitative determination of electron-donating ability of various compounds. The experimental conditions such as pH, ionic strength and the presence of low-molecular compounds could strongly affect the analysis precision. In this work, reduction of cytochrome c by quercetin under varied conditions has been studied. It was found that electron-donating ability of quercetin strongly depends on pH. On the contrary, changing the solution ionic strength does not affect the electron transfer reaction. The presence of some low-molecular compounds inhibits the redox reaction either by competition for redox equivalents or by blocking the electroactive sites on the surface of the protein. Based on results obtained, the optimal conditions for determination of polyphenolic compounds' electron-donating ability by cytochrome c have been proposed.
Bashilov A. V., Spiridovich E. V., Kurchenko V. P., Vlasova T. M., Senkevich G. G.
Comparison of alcohol extract chemical composition for Filipendula Mill. and Polemonium L. plants. pp. 76--80
Summary: The GC-MS-analysis of Filipendula ulmaria (L.) Maxim., Filipendula hexapetala Gilib. and Polemonium caeruleum L. root, flower and leaf extracts has been performed. Similarity in chemical composition and quantitative contents of biologically active compounds for Filipendula Mill, and sort Polemonium L. has been established. On the basis of these data, flowers and leaves have been recommended as the best medicinal raw material for those species.
Mel'nik O. V., Martinovich V. P., Golubovich V. P.
Antiaggregation activity of tripeptide Arg-bAla-Asp modified analogues. pp. 81--89
Summary: A series of Arg-bAla-Asp tripeptide analogues with selective protection of reactive groups has been synthesized using classical methods of peptide chemistry. It has been shown that the presence of free guanidine group of arginine and the b-carboxylic group of aspartic acid is necessary for antithrombotic activity.
GEOCHEMISTRY
Sokolik G. A., Ovsiannikova S. V., Voinikava E. V., Polenya M. V.
Uranium and radium content in the soil solutions of the south-western part of Belarus. pp. 90--97
Summary: The contents of uranium and radium in the pore soil solutions, which are the main chain in the geochemical and biological migration of the chemical elements, has been determined for the first time in Belarus. The control sites have been located outside the zone of Chernobyl fallout radionuclide contamination, that allowed evaluating the current background level of uranium and radium content in the soil solutions. The data on accumulation of the radioactive elements in the pore solutions give the opportunity to estimate the reserve of the radioactive elements in the migratory active forms in the soils. In the majority of soils studied, uranium content in the pore solution is higher than radium content, that points to the higher migratory ability of uranium. The direct correlation between content of fulvic acids' components in the soil solutions and accumulation of uranium in such solutions has been established.
Ryabova L. N., Mikhal'chuk N. V., Misyuta Yu. G.
Geochemical characteristics of carbonate complexes found on the west of Belarusian Polesye. pp. 98--103
Summary: Geochemical characterization of depression-carbonate complexes at Brest Polesye has been performed. It has been found that they have above-clarke Ca, Cu and Mn content an that chemical element content in them is controlled by position in catena soil. A series of radial geochemical barriers of varied capasity functions in the profile of these soils. In meliorated soils, the formation zone of natural geochemical barriers for manganese and copper is transformed, and new thechnogeochemical barriers, with abnormally high concetrations of these elements, are formed.
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Shevchuk V. V., Strelchenok E. V., Fedorov L. V.
Effect of water-in-oil emulsions on electrokinetic properties of calcite suspensions. pp. 104--106
Summary: The effect of water-in-oil emulsions stabilized with oil soluble surfactants of different types on electro-kinetic properties of calcite in organic medium has been studied by microelectroforesis technique.
Modification of calcite suspensions by these emulsions causes x-potential charge of mineral particles.
Markin A. D., Dihtievskaya L. V., Potkina T. N., Garbuz E. O., Shlomina L. E., Shevchuk V. V.
Effect of magnesium and calcium chlorides on flotation of Starobin deposit potassium ore. pp. 107--110
Summary: The effect of magnesium and calcium chlorides content in recycling brines on the technological characteristics of potassium ore flotation at Starobin deposit has been investigated. It has been shown that under twenty fold circulation of mother brine in the process of the sylvinite flotation of potassium ore, the accumulated content of calcium and magnesium chlorides does not have any negative effect on the technological characteristics of enrichment.
Romanovski V. I., Martcul V. N.
Effect of mechano-chemical activation of ion-exchange resin waste on dispersity and properties of products obtained. pp. 111--117
Summary: The results of waste ion-exchange resin mechanochemical processing investigation has been presented. Dispersity, element composition and other properties of the products obtained, have been determined.
SCIENTISTS OF BELARUS
Lesnikovich A.I., Krut'ko N.P., Agabekov V.Ye. et al.
Afanasy Andreevich Akhrem (To the of 95th anniversary). pp. 118--120.
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Lesnikovich A.I., Kaputskii F.N., Agabekov V.Ye. et al.
Yurii Grigorievich Egiazarov (To the 75th anniversary). pp. 121--123
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