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Application of Solid-surface Luminescence for Determination Indicator Coefficients of Polycyclic Aromatic Hydrocarbons

Authors: Volkova E. V., Rogachaeva S. M., Khurshudian G. N., Otradnova M. I., Suska-Malawska M., Shipovskaya A. B.

Luminescence of PAH (anthracene, phenanthrene, pyrene, fluoranthene, benzo(a)anthracene, chrysene, benzo(a)pyrene) in aqueous media and in the solid phase of cellulose diacetate is investigated. It is established that solid surface luminescence (SSL) analysis increases the detection sensitivity of PAH in water without extraction and preconcentration with organic solvents, an exception is chrysene. The spectral characteristics show SSL-method to be using for detection of indicator isomers pairs of PAH.

Electrostatic and Hydrophobic Interactions in the System: Synthetic Food Dye Е133 – Cetylpyridinium Chloride – H2O

Authors: Chernova R. K., Varygina O. V., Strelkova К. V.

Investigated the conditions of formation and solubilization ion associate synthetic food dye «brilliant blue» (Е133) ions with cetylpyridinium chloride (TSPKH). The composition of the associate, the solubility in water and micelles TSPKH. The importance of such interactions in the photometric, potentiometric and other methods of determination of synthetic food dyes.

Glaukonit’s Influence on Viability and Development Seeds of Some Grain Crops

Authors: Chernova R. K., Varygina O. V., Strelkova К. V.

It is defined macro- and microelement composition of glaukonite ore of the Beloozersky field of the Saratov region. It is established that it contains a set macro- and the minerals necessary for a mineral delivery of plants. The possibility of application of the studied glaukonite as tools for processing of seeds of grain seeding before crops, on the example of seeds of wheat and rye is considered. Effectiveness of processing of seeds of Marusenka rye and spring-sown Favourite weak field is studied by aqueous extracts of a glaukonite of various concentration (0,01; 0,1 and 1%).

Spatial and Electronic Structure of the Pyrene Molecule, Tripaflavin Cation and Eosin Anions As a Prerequisite for Interpreting Their Solid-phase Fluorescence

Authors: Volkova E. V.

At the B3LYP/6-311++G(d,p) level of theory, involving the NBO analysis, the spatial and electronic structure of the pyrene molecule, tripaflavin cation, eosin monoanion and dianion has been computed. The results obtained will offer a framework for interpreting the peculiarities of the above species solid-phase fluorescence.

Thermodynamic Analysis of Transformation Isomerization Reaction of n-Hexane on Zeolite Systems ZSM-5, Cr-Bi-ZSM-5

Authors: Aniskova Т. V., Kuzmina R. I., Федотов Э. А.

A comparative analysis of dependencies isomerization reaction, and the formation reaction of isobutane, isopentane in the temperature range from 573 to 673 K at the high-silicon ZSM-5 system and the same system modified with oxides of bismuth, and chromium.

Multicomponent Reaction 3,4-dihydronaphthalene-1(2H)-one with N-Nucleophiles

Authors: Ivanova А. L., Chesnokov D. V., Mazhukina О. А., Fedotova О. V.

Studied «one-pot» reaction of 3,4-dihydronaphthalene-1 (2H)-one with aromatic aldehydes and (thio)urea in conditions of modified Biginelli reaction under thermal and microwave exposure. Showed a reduction reaction time and increasing the yield of the desired products benzohinazolinonsderivatives with microwave activation starting compounds.

Sensor Plate in Horseradish Peroxidase Determination Based on Oxidation of Triphenylamine-4-sulphonic Acid by Hydrogene Peroxide

Authors: Kolontaeva О. А., Chernozubova E. V., Burmistrova N. A.

The oxidation of triphenylamine-4-sulphonic acid (TPASA) by hydrogen peroxide in presence of horseradish peroxidase (HRP) in weak acid medium and after incorporation of TPASA in polymeric hydrogel matrix of polyurethane (type D4) was investigated by spectrophotometry. The stability of TPASA product enzymatic oxidation under variation of reaction condition (reagents concentration, acidity) was studied. The optimum condition was selected and the possibility of HRP detection in sensor plate was shown with limit of detection 0.3•10-4 U/mL.

The Solid-state and Planar Sensors for the Determination of Cefotaxime in Aqueous and Biological Fluids

Authors: Kulapina E. G., Tyutlikova M. S.

Cefotaxime is a cefalosporin antibiotic possessing a high efficiency at curing severe bacterial infections. For the determination of cephalosporin antibiotics in different objects, spectroscopic, chromatographic, electrochemical methods, immunoassay, etc. are used, which demand for expensive devices and organic solvents. Potentiometric sensors let one expressively detect cefalosporin antibiotics in small samples without previous sample preparation.

Quantum Chemical Studies of Potential Associates in Europium (III) Alginate Solutions

Authors: Dzharlagasova D. N., Zakharova T. V., Pozharov M. V.

Metal-alginate complexes (especially, lanthanide gels) are particularly interesting for medical and biological analysis due to their luminescent properties upon UV light excitation. Unfortunately, synthesis and further physical and chemical studies of such complexes is inhibited by their high cost. However, this problem can be solved by using quantum chemical methods to predict potential properties of lanthanide alginates based on the results of their geometry optimization and electronic structure calculation.

Increase of Activity Industrial Catalys for Isomerisation Normal Hydrocarbons

Authors: Kuzmina R. I., Zaikin М. А., Manin S. D., Mendagalieva D. R.

Was done the studie of activity zeolite-containing catalyst Cr2О3 +Bi2О3 /ZSM-5 and technical catalyst SI-2, also they combained action in process of conversion of n-hexane at lay-by-layers download. In the process of conversion n-hexane on Cr2О3 +Bi2О3 /ZSM-5 catalyst prevails reaction of cracking and destroy of n-hexane to two symmetric molecule of propane (51,4%). Lay-by-layers download of Cr2О3 +Bi2О3 /ZSM-5 and SI-2 catalysts with high conversion nhexane to achieve a lot of contents iso-hydrocarbons in products of conversion with 200 oC.

Solid-state Potentiometric Sensors for the Determination of Cefuroxime Axetil in Aqueous Media and Oral Fluid

Authors: Kulapina E. G., Kulapina O. I., Alieva I. К.

Cefuroxime axetil is a cephalosporin antibiotic of the second generation, it is used in the sequential therapy of patient with sinusitis, community-acquired pneumonia, and other infectious somatic pathologies. For the determination of cephalosporin antibiotics in different objects, spectroscopic, chromatographic, electrochemical methods, immunoassay, etc. are used, which demand for expen- sive devices and organic solvents. Potentiometric sensors let one expressively detect cefalosporin antibiotics in small samples without previous sample preparation.

Effect of Surface Plasmon Resonance in the Fluorometric Properties of Molecules and Complexes

Authors: Smirnova T. D., Zhelobitskaya E. A., Danilina T. G.

The optical properties of noble metal nanoparticles feature the pres- ence of a pronounced resonance band in the visible light spectrum, called the surface plasmon resonance band. The influence of local surface plasmons on the dynamics of singlet–triplet energy transfer in the donor–acceptor pair is the subject of recent active studies by analysts in connection with the prospective using of nanoparticles in optosensorics and the opportunity of significant improvements of the metrological characteristics of analytical techniques.

Preconcentration of Е110 and Е124 Food Azodyes on Magnetite Nanoparticles Modified by CTAB

Authors: Kazimirova K. O., Khabibullin V. R., Reshetnikova I. S., Egunova O. R., Shtykov S. N.

Synthetic azodyes are widely used in paint, textile, plastic, and food, beverage, and leather, cosmetic, pharmaceutical and paper industries to make products more visually attractive to consumers. Therefore, they are also the components of waste waters and should be removed due to their potential risk to human health. Many techniques have been employed to eliminate dyes from waste water and do to preconcen- tration before analysis in food or beverage objects. One of the most popular and effective is magnetic solid-phase extraction (MSPE) with the use of magnetic nanoparticles (MNP).

Structure of Hydroperoxide Anion from the Viewpoint of Quantum Chemistry

Authors: Pankratov A. N., Tsivileva O. M., Tsymbal O. A., Khmelev S. S.

In living nature, of significance is lipid peroxidation caused by highly- reactive oxygen-containing species. Hydroperoxide anion –OOH represents a protolytic kind of hydrogen peroxide H2O2 – one of active forms of oxygen, – and a precursor of hydroperoxyradical •OOH – another one. The work is aimed at the investigation of spa- tial and electronic structure of hydroperoxide anion.

The Experimental Study of Solubility of Helium in Propan-2-ol at Temperatures 360, 420 and 480 К

Authors: Nikolaychuk P. A., Linnemann M., Baumehögger E., Sparrow I.

The experimental study of solubility of helium in propan-2-ol at high pressures and temperatures was performed. The following values of Henry’s law constants for the solution of helium in propan-2-ol were obtained: 168,7 ± 6,3 MPa at 480 К, 341,2 ± 13,6 MPa at 420 К and 602,0 ± 43,5 MPa at 360 К.

Phase Diagrams of the Ternary Systems Potassium Carbonate + Water + Hydrocarbon at 25°С

Authors: Il’in K. K., Cherkasov D. G., Kapustina D. V.

The phase diagrams of the ternary systems potassium carbo- nate+water+hydrocarbon (toluene, n.dodecane) at 25°С were first studied by means of the methods of sections and isothermal titration. The phase diagrams of both systems belong to those of ternary systems with salting-out of the binary heterogeneous system. Potassium carbon- ate sesquihydrate is the solid phase of monotectic equilibrium. Nine tie lines were drawn on the delamination field of the phase diagram of each ternary system.

Modelling of Drying Process of Natural Gas at a Pressure of 20–25 MPa through Aluminogel and NaA 4A Zeolite

Authors: Nikiforov I. A., Krivonosov A. A.

Containment of water vapor in natural gas prevents its transportation and applying as an internal combustion fuel. The most demanded drying technology is adsorption at high pressure. The construction of a mathematical model for predicting the process is a significant task. Through a mathematical model of the process of water adsorption from natural gas at pressures of 20–25 MPa and temperatures of 5–40°C in the presence of NaA 4A zeolite and aluminogel, commonly used dehumidifier, optimal drying conditions were selected.

Synthesis and Structure Mixedligand Complexes of Fe, Co and Ni with Dimerkaptophenols and Heterocyclic Diamines

Authors: Kuliev K. А., Verdizadeh N. A.

Physico-chemical methods investigated complexing Fe (II, III), Co (II) and Ni (II) with di mer kap tophenols (2,6-dimerkaptophenol, 2,6-dimercapto- 4-methylphenol, 2,6-dimercapto-4-ethy l phenol, 2,6-dimercapto-4-propylphenol and 2,6-dimercapto-4-tert-butylphenol), and hyd rophobic amines. The hydrophobic amine were used as heterocyclic diamine- 1,10-phenan thro line, 2,2’-bipyridyl and 4,7-diphenyl-1,10-phenanthroline (batofenantrolin). The optimal conditions for the formation and extraction mixedligand complexes and set the ratio of the components in the complexes.

Investigation of the Structure and Ways of Formation of Isomeric Tyenylsubstituted Triazolohexohydroquinazolines by Methods of NMR Spectroscopy and Chromato-mass-spectromectry

Authors: Vasilkova N. O., Krivenko A. P., Brudnik S. V.

In the three-component condensation of thiophenecarbaldehyde, cyclohexanone and 3-amino-1,2,4-triazole triazolohexahydroquinazolines are formed, which are isomeric in the type of the ring junction and the double bond position in them, the structure of which is established by 1H NMR spectra. With the GC-EIMS-analysis of the composition of the reaction mass at various temperatures, it has been established that an intermediate in the formation of final products is azomethine (instead of a possible α,β-unsaturated ketone).

The Determination of Biological Effects of New Heterocyclic Compounds on Plants and the Evaluation of Environmental Safety of Their Application

Authors: Gubina T. I., Tumskiy R. S., Aniskov A. A., Klochkova I. N., Isaeva S. V., Ukhova А. А.

Еcotoxicological evaluation of two new polyheterocyclic compounds was spending. Acute toxicity of test substances, their lethal and safe concentration (LC and BC) were determined. The nature of the biological effect of these compounds on the plants was investigated. The substances were stimulants during the germination of seeds of wheat and peas and inhibitors of the growth of the roots and stems of seedlings. It was determined the effect of various concentrations of tested compounds on the growth characteristics of plants.

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