Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2008, No.1
/ Publications / Scientific Journals
Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2008, No.1
| 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 1, 2008
CONTENTS
INORGANIC CHEMISTRY
Klyndyuk A. I., Chizhova Ye. A.
The effect of La and Ba substitution on properties of LaBaCuFeO5+d. pp. 5--8
Summary: The effect of lanthanum (barium) 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 A-sublattice of LaBaCuFeO5+d leads to 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 decreased with donor substitution and increased with acceptor substitution of lanthanum in LaBaCuFeO5+d.
Mozheyko F. F., Shulga N. V., Shevchuk V. V.
Production of defuorinated phosphoric acid by precipitation of hexafuorophosphates. pp. 9--14
Summary: Potential capabilities of precipitation method in defluorination of extraction phosphoric acid have been studied. It has been found that the residual fluorine comtent in the purified acid (no less than 0.1 wt.%) is governed by the solubility of precipitated hexafluorosilicates. Fine purification of acid is achieved by simultaneous precipitation of different admixtures. Separation of the precipitate formed from the mother liquor is the limiting step of the purification process.
Bashkirau L. A., Lubinski N. N., Petrov G. S., Shauchenka S. V., Galyas A. I.
Magnetic susceptibility and effective magnetic moment of neodymium ions in Nd2O3, NdScO3, NdGaO3 and NdInO3. pp. 15--20
Summary:
COLLOIDAL CHEMISTRY
Vorobiova E. V., Krutko N. P., Basalyga I. I., Matrunchik J. V.
Polymeric complexes based on poly(acrylic acid), poly(ethyleneglycol) and poly(vinyl alcohol). pp. 21--25
Summary: Complex formation in the system containing poly(acrylic acid), poly(ethylene glycol) and polyvinyl alcohol) and its dependence upon components' ratio, molecular mass, pH and temperature of the solution has been studied. It has been shown that thermal treatment of complexes based on high molecular mass components (poly(acrylic acid) and polyvinyl alcohol)) results in the formation of hydrogel -- a compound which has a chemically cross-linked three-dimensional lattice. This way, it has been demonstrated, it is possible to produce new materials possessing unique properties, different from initial polymers.
ANALYTICAL CHEMISTRY
Leschev S. M., Zayats M. F., Yurchenko R. A., Vinarsky V. A.
Distribution of polyols between lower aliphatic alcohols and aqueous solutions of inorganic salts. pp. 26--31
Summary: Distribution of alcohols and poly ols between saturated aqueous solutions of salts and organic solvents has been studied in systems (NH4)2SO4 - H2O - hexane, KF - H2O - hexane, K2CO3 - H2O - hexane, K3PO4 - H2O - hexane, KF - H2O - ethanol, K2CO3 - H2O - ethanol, K3PO4 - H2O - ethanol, KF - H2O - 2-propanol, K2CO3 - H2O - 2-propanol, K3PO4 - H2O - 2-propanol, KF - H2O - 1-butanol, K2CO3 - H2O - l-butanol, K3PO4 - H2O - l-butanol, at 20.0۪.1 °C. These extraction systems have been compared using group increments of logarithm of distribution constant. It has been found that use of water solutions of inorganic salts with lower alcohols as extractants gives the effective instrument for extraction and partition of highly hydrophilic compounds, e. g. polyols.
Orlovskaya L. A.
Robustness determination for method of heavy metal ion sorption preconcentration on FIBAN X-1 sorbent. pp. 32--37
Summary: Effect of "matrix" factor on "degree of determination" variable has been studied. Robustness of dynamic pre-concentra-tion method of copper, zinc, lead, cadmium, nickel and manganese ions with fibrous chelating sorbent FIBAN X-l has been established. It has been shown that this method is applicable for analysis of various water objects.
PHYSICAL CHEMISTRY
Velikanova I. A., Ivanova N. P., Zharsky I. M.
Anodic oxidation of oxalic acid on metal-oxide electrodes. pp. 38--41
Summary: Process of oxalic acid anodic oxidation on metal-oxide electrodes has been investigated. Kinetic parameters of this process proving the electrochemical nature of the limiting reaction stage have been determined. Effect of electrolysis conditions on current yield and oxalic acid decomposition degree has been studied. It has been established that metal-oxide electrodes possess rather high selectivity to oxalic acid oxidation process. Current yields for oxalic acid decompositions on all investigated electrodes are generally in the range of 86--93%. Current concentration affects substantially oxalic acid decomposition degree.
Makarevich N. A., Afanasyev N. I., Boytsova T. A., Moshkova T. B., Polikarpov V. A.
Polyelectrolyte properties of dyalized lignosulfonates. pp. 42--47
Summary: Essentially new data about dissociation strong lignosulphopolyacids has been received. It is shown, that at high concentration of its polyacid dissociation rather it is not high (nearby 0.1), and only at very strong dilution the degree dissociation reaches solutions 0.7.
Kurilo I. I., Zharsky I. M.
Stability of Co--Cu--Sn alloys’ anode oxidation products in acid solutions. pp. 48--53
Summary: Kinetic peculiarities and mechanisms for electrochemical oxidation processes of Co-Cu-Sn alloys in sulfate and sulfate-chloride acid solutions have been studied. It has been found that alloys dissolve selectively; limiting stages of the oxidation process have been determined. The effect of electrolyte composition on stability of various valence forms of anode dissolution product has been studied. Equilibrium constants of disproportionation and reproportionation reactions for equilibrium systems containing the alloy's metals have been calculated.
ORGANIC CHEMISTRY
Dikusar E. A., Kozlov N. G., Tlegenov R. T., Yuvchenko A. P.
Lupinine salts with carboxylic and sulphonic acids. pp. 54--56
Summary: A method for synthesis of lupinine salts with carboxylic and sulphonic acids has been described. Antibacterial activity of lupinine salts against tuberculosis causative agent has been studied.
Cherevin M. S., Gulevich T. G., Zubreichuk Z. P., Popova L. A., Knizhnikov V. A.
Synthesis of g-glutamyltriptophan derivatives. pp. 57--63
Summary: Methods for preparation of compounds containing g-glutamyl triptophan fragment using trifiuoracetyl aminoprotective groups, have been proposed.
BIOORGANIC CHEMISTRY
Khripach V. A., Zhabinskii V. N., Antonchick A. V., Khripach N. B.
Analysis of C-24 functionalized steroids’ structure by high resolution NMR. pp. 64--68
Summary: A series of 24(R)- and 24(S)-functionalized steroids has been studied by NMR spectroscopy. The found differencies in 1H and 13C NMR spectra can be used to identify and differentiate these two groups of C-24 epimers.
Dubovskaya L. V., Vashkevich I. I., Sviridov O. V.
Biospecifc method for detection of biotinylated immunoglobulins. pp. 69--73
Summary: A test system and procedure for quantitative determination of poly-biotinylated immunoglobulins in physiological fluids and biotechnological media has been developed. The analytical principle involves the binding of different biotin residues on immunoglobulin molecule with a streptavidin-coated solid phase and a soluble streptavidin-peroxidase conjugate. The system allows biotynyl-immunoglobulin measurement in 0.1 ml of human serum in a concentration range of 5-100 µg/l and can easily be adapted to other biotinylated proteins.
Agabalayev A. A., Yakimovich I. V., Kuvaeva Z. I.
Relationship between erythromycin inactivation and pH of the medium. pp. 74--77
Summary: Stability of erythromycin with time in acidic water solution has been studied. It has been shown that erythromycin inac-tivation strongly depends on water phase pH and reaction time.
Cherviakovsky E. M.
Assessment of flavonoids’ electron-donating ability using Cytochrome c. pp. 78--85
Summary: A new method for assessment of electron-donating properties of flavonoids has been proposed. The degree of the hemeprotein reduction has been determined by means of the differential absorption spectroscopy technique. Spectral data were analyzed using two calculation methods, giving close results, as demonstrated by using quercetin molecule as a model. The most and the least efficient electron donors for cytochrome c among flavonoids have been found. It has been found that structural characteristics of flavonoid molecules, such as presence of hydroxyl groups at C3 and C3' positions and double bond at C2-C3 position, as well as degree of hydroxylation, determine their electron-donating properties. The number of donated electrons depends on position and number of hydroxy groups at B-ring of a flavonoid. These data show good correlation with information on oxidative-reductive properties of flavonoids obtained for other model systems.
Litvinko N. M., Rakhuba G. N., Kuchuro S. V., Rubinov D. B., Zeldakova T. A., Golovach O. A., Tahanovich A. D.
Effect of sulfur-containing heterocyclic b-dicarbonyl and b-tricarbonyl compounds on secretory and intracellular phospholipase A2 activity. pp. 86--93
Summary: It has been found that inhibition of phospholipase A2 (PLA2) by thiotetronic acid derivatives depends on enzyme origin (porcine pancreas or lung cells), charge and form of interphase surface organization. Some structural requirements for a potential pancreatic phospholipase A2 inhibitor, such as presence of unsaturated fragments and electronegative groups in lateral substituent of thiotetronic acid derivatives, have been formulated.
POLYMER CHEMISTRY
Bildyukevich A. V., Movchansky M. A., Varslovan E. S.
Effect of bore liquid temperature on structure and permeability of hollow fber membranes. pp. 94--100
Summary: A novel lower critical solution temperature (LCST) membrane forming system containing polysulfone /polyethyleneglycol/ N, N-dimethylacetamide had been developed. Hollow fiber ultrafiltration (UF) membranes were prepared using dry-jet wet-spinning process. Effect of bore liquid temperature on morphology and performance of polysulfone hollow fiber membranes has been investigated. SEM images show that increasing gelation temperature leads to macrovoids' formation and produces the thin-skinned membrane with high flux.
Globa A. I., Bogushevich S. E., Krut’ko E. T.
Thermoimidization of poly-(4,4'-diphenoxy)pyromellitamic acid-cobalt acetylacetonate disperse system. pp. 101--105
Summary: The disperse system of poly(4,4'-diphenoxy)pyromellitamic acid -- cobalt acetylacetonate has been studied under thermal amidization conditions using DTA, ESR and IR spectroscopy methods. It has been established that presence of Co2+ ions in the pre-polymer catalyses polimeric radical formation and recombination during solid phase cyclization. It has been shown that water participates in these processes.
Egorova E. L., Yakimtsova L. B., Matusevich Yu. I., Krul L. P.
Radical copolymerization of methyl methacrylate and acrylic acid: composition of products. pp. 106--109
Summary: Radical bulk copolymerization of methylmethacrylate with acrylic acid has been investigated. Copolymer's composition has been determined by acidic-base titration in non-aqueous solutions. Copolymerization constants of r1 and r2 have been determined.
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Dikhtievskaya L. V., Markin A. D., Shlomina L. F., Ivaniutsin A. G., Mironenko I. N., Shevchuk V. V.
Conditioning of potassium chloride grains with sodium carbonate and sodium hydroxide. pp. 110--114
Summary: The effect of inorganic modifiers (sodium carbonate and hydroxide) upon moisture resistance of potassium chloride grains has been investigated.
Romanovski V. I., Martcul V. N.
Thermal destruction of waste synthetic ion-exchange resins. pp. 115--119
Summary: Thermal destruction of waste ion-exchange resins at 50-550 °C has been studied. The relationship between pyrolysis temperature and yield of different fractions have been established, their quantitative and qualitative composition have been determined.
SCIENTISTS OF BELARUS
Lesnikovich A.I., Lishtvan I.I., Kaputskii F.N. et al.
Vladimir Semenovich Komarov (To the 85th anniversary). pp. 120--122
Click here to read this article in Russian (Win1251)
/ Publications / Scientific Journals / Back to Top of Page
Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: February 23, 2008
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2008 The National Academy of Sciences of Belarus
Copyright © 2008 The Belaruskaya Navuka Publishing House
