Journal of Chemistry and Technologies <p>The journal is a peer-reviewed edition that supports the policy of open access to scientific publications. <br /><strong> Year of Foundation </strong> 1993. Until 2018 - Vìsnik Dnìpropetrovs’kogo unìversitetu. Serìâ Нìmìâ (Bulletin of Dnipropetrovsk university. Series Сhemistry) (ISSN: 2306-871X (Print), ‎2313-4984 (Online))<br /><strong> Field and issues: </strong> The scientific edition Journal of Chemistry and Technologies publishes the results of new research in the field of applied and theoretical chemistry, the history of chemistry, analysis of chemical objects, synthesis of organic compounds, development of electroplating technology, research of coordination compounds, chemical and food technology.<br /><strong>ISSN:</strong> 2663-2934 (Print), 2663-2942 (Online). <br /><strong> Certificate of state registration:</strong> Свідоцтво про державну реєстрацію друкованого засобу масової інформації Серія КВ № 23401-13241ПР від 24.05.2018 року. <br />The edition is included in the «Перелік наукових фахових видань України категорії А, в яких можуть публікуватися результати дисертаційних робіт на здобуття наукових ступенів доктора і кандидата наук». Approved by order No. 409 of the Ministry of Education and Science of Ukraine dated 17.03.2020. <br /><strong> Periodicity: </strong> 2-4 issues per year.<br /><strong> Languages of publication:</strong> Ukrainian, Russian, English (mixed languages). <br /><strong> Founder: </strong> <a href="" target="_blank" rel="noopener">Oles Honchar Dnipro National University</a>. <br />Executive Editor: Okovytyy S. I., Doctor of Chemical Sciences. <br />Executive Secretary: Plysovskaya E. A., Candidate of Chemical Sciences. <br />Editorial office address: 72 Gagarin Av., Dnipro, 49010, Ukraine.<br />Phone: ‎+380567768223 <br />E-mail: <a href=""></a></p> <table border="0" align="center"> <tbody> <tr> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> The latest issue </a></td> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Guidance for authors: </a></td> </tr> <tr> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Indexing: </a></td> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Ethical Standards: </a></td> </tr> <tr> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Archive ‎(2012-2018)</a></td> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Sponsors </a></td> </tr> <tr> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Editorial board </a></td> <td><img src="" alt="" width="25" /></td> <td><a href="" target="_self"> Contact information </a></td> </tr> </tbody> </table> Oles Honchar Dnipro National University en-US Journal of Chemistry and Technologies 2663-2934 <ol><li>Authors reserve the right of attribution for the submitted manuscript, while transferring to the Journal the right to publish the article under the <a href="">Creative Commons Attribution License</a>. This license allows free distribution of the published work under the condition of proper attribution of the original authors and the initial publication source (i.e. the Journal)</li><li>Authors have the right to enter into separate agreements for additional non-exclusive distribution of the work in the form it was published in the Journal (such as publishing the article on the institutional website or as a part of a monograph), provided the original publication in this Journal is properly referenced</li><li>The Journal allows and encourages online publication of the manuscripts (such as on personal web pages), even when such a manuscript is still under editorial consideration, since it allows for a productive scientific discussion and better citation dynamics (see <a href="">The Effect of Open Access</a>).</li></ol> CONTINUOUS CONVERSION OF FRUCTOSE INTO METHYL LACTATE OVER SnO2–ZnO/Al2O3 CATALYST <p>The continuous conversion of fructose into methyl lactate on SnO<sub>2</sub>–ZnO/Al<sub>2</sub>O<sub>3</sub> catalyst that may be of practical interest is efficiently performed. The supported 10SnO<sub>2</sub>–5ZnO/Al<sub>2</sub>O<sub>3</sub> catalyst was obtained by a simple impregnation method of granular <em>γ</em>-Al<sub>2</sub>O<sub>3</sub> with the aqueous solution of SnCl<sub>4</sub> and Zn(OAc)<sub>2</sub>. The data on structural analysis, textural and acid-base parameters of synthesized samples are performed. The following optimal conditions for obtaining of 70% methyl lactate yield at 100% fructose conversion were found: use of 4.8 wt.% fructose solution in 80% aqueous methanol as initial mixture, reaction temperature of 180 °С at 3.0 МPа. Addition of Zn ions to catalyst content allows using the initial fructose mixture without potassium carbonate. 10SnO<sub>2</sub>–5ZnO/Al<sub>2</sub>O<sub>3</sub> catalyst provides full fructose conversion at 70% methyl lactate selectivity for 6 h on stream. Spent catalyst after regeneration by washing at 120 °С restores initial activity.</p> Svitlana V. Prudius Natalia L. Hes Artur M. Mylin Volodymyr V. Brei Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-25 2021-04-25 29 1 1 9 10.15421/082107 SYNTHESIS OF HYDROXYAPATITE USING VARIOUS SACCHARATE TYPES <p><strong>The work considers the preparation of hydroxyapatite from calcium sucrate and calcium dextrates solutions by chemical precipitation. It has been shown that the use of calcium sucrate makes it possible to obtain the pure hydroxyapatite phase even without further heat treatment of the precipitate. The IR spectroscopic studies confirm the obtaining of the pure hydroxyapatite phase with carbonate-ions substitution by B-type in HAp samples. The synthesis with a low temperature dextrin leads to the production of hydroxyapatite with a small admixture of tricalcium phosphate, a further increase in temperature also leads to the production of pure hydroxyapatite. According to the X-ray analysis, all the obtained hydroxyapatite powders are characterized by the crystallite size in the nanoscale. Obtained SEM images of the powders indicate compact hydroxyapatite aggregates with the sizes of 5-30 microns when using calcium sucrate complexes and loose particles in the range of 1-20 microns when using dextrin.</strong></p> Alla О. Serhiienko Tetiana А. Dontsova Tetiana Ye. Mitchenko Svitlana V. Nahirniak Olena I. Yanushevska Andryi V. Lapinskyi Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-25 2021-04-25 29 1 10 18 10.15421/082103 COPPER-CARBON NANOCOMPOSITES BASED ON SYNTHETIC HUMIC SUBSTANCES <p><strong>A new method for the synthesis of a copper-carbon nanocomposite using synthetic humic substances as a carbon source is presented. The method is based on the pyrolysis of copper (II) humate in reducing (Н<sub>2</sub>) and in inert atmosphere (Ar). </strong><strong>The s</strong><strong>tructure and properties of the Cu/C </strong><strong>nanocomposi</strong><strong>t</strong><strong>es were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, transmission electron microscopy (TEM), elemental analysis. The porous structure of Cu/C nanocomposite investigated using the nitrogen volumetric adsorption. Under the conditions of synthesis, a carbon matrix with a very low degree of ordering is formed. It was found that the dimensional and structural characteristics of copper nanoparticles depend on the synthesis conditions and vary from 40 to 80 nm. Carrying out the synthesis in a reducing atmosphere makes it possible to obtain copper-carbon nanocomposites that do not contain copper(I) oxide or copper(II) oxide phases. It was found that an increase in the pyrolysis temperature contributes to the improvement of the structure of the crystal lattice of the metal phase, an increase in the degree of carbonization of the organic component, and a change in the textural characteristics from mesoporous to microporous.</strong></p> Valentina A. Litvin Roger Abi Njoh Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-27 2021-04-27 29 1 19 30 10.15421/082113 INVASTIGATION OF FATTACIDIC COMPOSITION AND PHYSICO-MECHANICAL INDEXES OF DRY MILK MANYCOMHJNTNT MIXTURES <p><strong>Dry milk products are in growing demand and popularity. In this scientific work we have investigated the influence of sunflower oil on fattyacidic composition of fat phase and physico-mechanical qualities of dry polycomponent mixtures. The fattyacidic composition was determined by capillary gas-liquid chromatography, physical and mechanical parameters were determined by standardized methods. It was found that the use of sunflower oil has a positive effect on fattyacidic composition, organoleptical and physico-mechanical indexes of mixtures. It was determined that the addition of 2.5 % sunflower oil to the dry mixtures it increases the mass fraction (part) of fat in them by 57 %, decreases the hygroscopicity by 7.1 %, increases the specific gravity by 41.7 % in comparison with the control sample without vegetable oil. It was stated that the dose of vegetable oil doesn’t influence on the indexes of solubility and active acidity of the product. It was defined he introduction of vegetable oil in an amount of 1.5 % and 2.5 % considerably changes the balance of fatty acids improving the nutritional value of product, as evidenced by the correlation of SFA (saturated fatty acids): MUFA (monounsaturated fatty acids): PUFA (polyunsaturated fatty acids) proves it. It was stated that the sunflower oil content close to 1.5 % allows the highest coefficient characterizing the biological action of fats in the product.</strong></p> Antonina V. Minorova Natalia L. Krushelnitska Oksana V. Bodnarchuc Serhiy A. Narizhny Svitlana P. Vezhlivtseva Nataliia P. Shapovalova Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-25 2021-04-25 29 1 55 64 10.15421/082101 RESEARCH OF THE CHEMICAL COMPOSITION OF BONEY OIL AND DEVELOPMENT OF BUCKETS BASED ON IT <p><strong>According to the literature, the number of diseases associated with nutrient imbalance in the daily diet is growing in the world. To this end, the need to create new products with a balanced chemical composition is justified. The expediency of using plum and turf seeds as raw materials for oil production is substantiated. The chemical composition of plum seed oil and turf seed oil was studied. Plum seed oil has been found to be close to the optimal ratio of fatty acids. And in the oil from turf seeds found some deviations from the optimal ratio of fatty acids. In addition, the content of tocopherols in these oils is higher than in traditional oils. It was found that the fatty acid composition of traditional oils does not correspond to the optimal ratio of saturated, monounsaturated and polyunsaturated fatty acids, and oils in the native form with the "ideal" fatty acid composition are absent. Therefore, the appropriate solution to this problem is to create blends from different types of oils. Blends with turfgrass oil and soybean and sunflower oils have been developed. It is established that the biological value of fat of the obtained blends corresponds to the optimal ratio of fatty acids. In addition, a blend was obtained, which can be recommended for therapeutic nutrition.</strong></p> Kristina O. Belinska Copyright (c) 2021 Дніпровський національний університет імені Олеся Гончара 2021-04-25 2021-04-25 29 1 65 76 10.15421/082102 THE EFFECT OF HIGH PRESSURE ON SOY PROTEIN FUNCTIONAL FEATURES: A REVIEW <p><strong>The aim of this work is to research the effect of high pressure on soy protein and its main components: 7S and 11S glycinins; changes of soy protein technological and functional features.</strong></p><p><strong>Results: soy protein, 7S and 11S glycinins functional features processed by high pressure are analyzed, as well as their emulsion features, ability to retain water, gel features. The impact of pressure, time and temperature of the process on soy protein is researched. Structural changes of 7S and 11S glycinins, conformations, technological and functional features are analyzed. Soy protein isolate processing with high pressure improves its rheological, gel features and moisture content. Due to reasonable parameters soy protein and 7S and 11S glycinins processing with a high pressure increased moisture content; improved gel and emulsion features; influenced on non-covalent and covalent bonds and protein conformation; decreased soy protein's allergenicity in food products, including baby formulas. Despite great efforts, the mechanism of soy protein and 7S and 11S glycinins processing is still insufficiently understood, which makes it difficult to get a clear and unambiguous idea of their behavior.</strong></p><p><strong>Conclusions. The use of high pressure and soy protein isolate combination can improve functional and consumptional features of soy protein and food safety. </strong></p> Li Yan-ping Valerii О. Sukmanov Ma Hanjun Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-25 2021-04-25 29 1 77 91 10.15421/082104 SOLVENT SELECTION FOR EXTRACTION OF TARGET COMPONENTS FROM AMBER <p>Amber (succinite) is a potential source of a natural biologically active components complex that are promising to use for its intended purpose in various industries. In the presented work a wide range of multipolar solvents for extraction of target components from amber of Volyn region (Ukraine) is investigated, their influence on efficiency of this process and qualitative characteristics of the received extract is noted. For a number of organic solvents, the extraction efficiency of soluble solids as a quantitative characteristic of the solvent was studied. According to this indicator, the best extractants are white spirit, ethanol, acetone and petroleum ether. As an indicator of the quantitative efficiency of extraction of dyes represented in the raw material by the fraction of the resin, it is possible to use the optical density value of the extracts, with the highest values obtained in the case of acetone and ethanol. The redox potential value of the obtained extracts increases in the extraction process with all solvents except water, with which this indicator did not change. The change in color and structure of the obtained meal is illustrated by photographs of the appearance of amber after extraction. Low polar solvents, such as acetone and ethanol, which can remove both hydrophilic and hydrophobic substances, have been found to be most effective for extraction of target components from amber. In industries that work with technologies and products with high safety requirements, it is advisable to use ethanol to extract the target components from amber</p> Valentyn M. Chornyi Taras H. Mysiura Nataliia V. Popova Volodymyr L. Zavialov Copyright (c) 2021 Дніпровський національний університет імені Олеся Гончара 2021-04-25 2021-04-25 29 1 92 99 10.15421/082106 INFLUENCE OF SODIUM SALT ADDITIVES ON THE PROPERTIES OF COATINGS CONTAINING INDUSTRIAL WASTE <p><strong>The paper investigates the effect of sodium salt additives on the optical-color properties of coatings containing glass cullet, clay materials and production waste: granulated blast furnace slag, dump slag from ferrosilicon manganese production, fuel slag and fly ash from a thermal power plant, as well as granite screening. For the research, sodium salts were selected: Na<sub>2</sub>CO<sub>3</sub>, NaNO<sub>3</sub>, Na<sub>2</sub>SO<sub>4</sub>, NaCl, which were introduced in an amount corresponding to the content of 1.5; 3 and 6 parts by weight Na<sub>2</sub>O. It is established that the increase in the content of Na<sub>2</sub>O salts introduced over 1.5 wt. including deteriorates the rheological properties of the slip and the quality of coatings. It was determined that the type of anion (СО<sub>З</sub><sup>2–</sup>, NO<sub>3</sub><sup>–</sup>, SO<sub>4</sub><sup>2–</sup>, Cl<sup>–</sup>) with a constant Na <sup>+</sup> cation of the studied salts insignificantly affects the optical-color properties of the coatings, but the introduction of Na<sub>2</sub>O with Na<sub>2</sub>CO<sub>3</sub> provides a better surface coating. Additions of sodium salts contribute to a slight lightening of the color of the experimental coatings, but do not increase the gloss at a firing temperature of 1000 <sup>o</sup>C, except for the original coating without the content of industrial waste.</strong></p> Yaroslava I. Koltsova Copyright (c) 2021 Дніпровський національний університет імені Олеся Гончара 2021-04-25 2021-04-25 29 1 100 107 10.15421/082105 CATALYTIC OXIDATION OF DICHLOROMETHANE AND TETRACHLORETHYLENE OVER NOBLE METAL CATALYSTS <p><strong>Among the chemicals emitted to the atmosphere, volatile organic compounds (VOCs) are classified worldwide as hazardous air pollutants.</strong> <strong>Most of the VOCs are organochlorine compounds, widely used in industryas the components of detergents and degreasers, chemical extractants, additives for paints, inks and adhesives, raw materials for drug synthesis, pesticides and polymers, solvents for chemicalsand paint strippers. These compounds are released into the atmosphere and pose a significant health hazard due to their pronounced toxicity, high stability and persistence in the environment.</strong> <strong>In this study, a total of 6 different metal monoliths containing γ-Al<sub>2</sub>O<sub>3</sub> were studied in the oxidation of dichloromethane (DCM) and tetrachlorethylene (perchlorethylene-PCE). Pt, Pd, separately, were used as the active substances.</strong> <strong>Before the research experiments of the catalysts have been started, the water supply was optimized. Among the studied catalysts, Pt/Al<sub>2</sub>O<sub>3</sub></strong> <strong>was the most active in the oxidation of DCM.</strong></p> Irada M. Gasan Arif J. Efendi Elmir M. Babayev Aytadj M. Salakhli Konul Sh. Musazadeh Asmet N. Azizova Guseyn M. Faradjev Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-26 2021-04-26 29 1 108 116 10.15421/082110 UV-CURABLE PROTON CONDUCTIVE ORGANIC-INORGANIC MEMBRANES BASED ON ACRYLIC MONOMERS AND SOL-GEL DERIVED SILICA <p><strong>This article describes the synthesis and characterization of the new UV-curable cross-linked hybrid polymer-inorganic</strong> <strong>materials. The membranes were synthesized <em>via</em> UV-initiated copolymerization <em>in situ </em>based both on hydrophilic and hydrophobic acrylic monomers with the simultaneous formation of inorganic network in sol-gel reaction of precursors 3-methacryloxypropyl trimethoxysilane (MAPTMS) and tetraethyl orthosilicate (TEOS). The composition of the polymeric counterpart was varied by changing the ratio of hydrophilic and hydrophobic monomers while the content of the inorganic counterpart was kept constant. FTIR, SEM were used to characterize the morphology and chemical structure of the resulting membranes. The proton conductivity, oxidative stability, water and methanol uptake of the synthesized membranes were measured, and strong correlation between the properties of the membranes and the monomer ratio (AMPS : AA) was established, which makes it possible to regulate the membrane characteristics.</strong> <strong>The obtained new UV-curable cross-linked hybrid polymer-inorganic materials can be used for the development of the proton-conducting membranes for fuel cells.</strong></p> Iryna Yu. Yevchuk Mariia М. Zhyhailo Copyright (c) 2021 Дніпровський національний університет імені Олеся Гончара 2021-04-26 2021-04-26 29 1 117 127 10.15421/082109 STUDY OF THE KINETICS OF THERMAL DECOMPOSITION OF RICE HUSK, PURIFIED FROM CELLULOSE <p><strong>A relevant task of today’s materials science is enhancing the characteristics of the materials combined with reducing energy consumption and environmental impact during their synthesis. Silicon dioxide is one of the materials for an extremely wide range of application. Currently, the requirements for the operational characteristics of silicon dioxide concern the production of nanosized amorphous silicon dioxide of high purity. The production of silicon dioxide can be made environmentally friendly by using the rice husks as a renewable and cheap raw material. The technology for production of silicon dioxide from the rice husks is less energy-consuming in comparison with traditional processing of quartz and this technology produces a significantly lower pollution impact on the environment. To obtain high purity silicon dioxide from the rice husks, the authors have proposed to extract the amorphous component of cellulose prior to the heat treatment of plant raw materials. This operation was carried out during 6 hours at a temperature of 100 °C with stirring the pulp in a 15 % sulfuric acid solution. Analysis of the phase composition of silicon dioxide obtained from the rice husks after the acid treatment showed that the amorphous phase of silicon dioxide is obtained in the temperature range of 600–650 °C. Based on the results of studying the kinetics of thermal destruction of rice husks under the non-isothermal conditions, a mathematical model of the process has been proposed, which makes it possible to determine the degree of decomposition of the rice husks, depending on the temperature of their heat treatment. This is necessary in the design of equipment for processing the rice husks in the production of high purity silicon dioxide. </strong></p> <p> </p> Yuri E. Sknar Tatyana V. Hrydnieva Anna O. Liashenko Pavel V. Riabik Irina V. Sknar Yehor A. Hrydniev Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-29 2021-04-29 29 1 128 136 10.15421/082112 OPTIMIZATION OF TECHNOLOGICAL PARAMETERS OF NUTRITION MIXTURE FERMENTATION PROCESS WITH THE USE OF SPLINE INTERPOLATION <p><strong>A technology for producing a sourdough based on pure cultures of lactic acid bacteria without adding baker yeast and synthetic additives has been developed. It is proposed to use gluten-free soy and whole grain spelled flour as a nutritional mixture. The process of sourdough fermentation has been investigated in relation to the physicochemical parameters: the lifting force and titrated acidity. The experiments were conducted with temperatures of pure cultures symbiosis cultivation at 22 °C and 40 °C. To intensify the process of fermentation of a nutritious mixture, additional substrates were introduced into the sourdough cultures - lactulose, sorbitol, lactose and fructose in concentrations of 2, 4, 6 and 8 %. The efficiency of using the nucleotide adenosine triphosphate (ATP) at concentrations of 25, 50, 75, 100 mg/kg of flour in the sourdough culture samples has been investigated. The studied samples of sourdough cultures have a stable form of pasty consistency, acidity between 10 and 14 degrees Turner, ball lifting force no more than 25 minutes and humidity of 48–50 %. Finished products were subject to organoleptic evaluation. According to the results of evaluating organoleptic parameters, as well as porosity, the best samples of functional bread were obtained by using the sourdough on lactulose base with the addition adenosine triphosphate as an energy source. By using mathematical model based on spline interpolation, the optimal technical parameters have been obtained to minimize the time of technological cycle of sourdough producing. The optimal concentrations for lactulose and adenosine triphosphate nucleotide have been found, which are 4.34 % and 46.7 mg/kg of flour, respectively. Due to the peculiarities of the enzyme systems of lactic acid bacteria pure cultures, the introduction of the proposed technology for producing sourdough to the practice of producing functional bread will make it possible to obtain a high-quality product with a fermented carbohydrate component. The products obtained have a prolonged shelf life due to lactic acid. They also meet the established standards for physicochemical, organoleptic and microbiological indicators during the period of sale. This technology can be adapted by large and craft bakeries.</strong></p> Iryna М. Korniienko Oleh Р. Lutsenko Volodymyr М. Isaienko Mykhailo М. Baranovskyi Andrii S. Anatskyi Lyudmila P. Laricheva Copyright (c) 2021 Дніпровський національний університет імені Олеся Гончара 2021-04-30 2021-04-30 29 1 137 154 10.15421/082115 FUNCTIONAL PROPERTIES OF FOUR KINDS OF OILSEED PROTEIN ISOLATES <p><strong>Plant proteins can be applied in food processing as alternatives to animal protein. Recently, popular additives of plant proteins such as soybean protein and peanut protein are widely applied in food products, like meat products, beverages, and breads. Besides, new plant proteins such as pumpkin seed protein and sunflower seed protein also get more and more attention in food industry. These plant proteins need to satisfy some special functional properties such as oil-absorbing ability and emulsifying property for developing new food products by industry. It is necessary to analyze these functional properties and make a comparison for better utilization. Since the alkaline solution and acid precipitation is still an effective method to satisfy the demand of industrial large-scale production to protein isolates. In the present study, using alkali solution and acid precipitation, four kinds of oilseed protein isolates such as peanut protein isolate (PEPI), pumpkin seed protein isolate (PUPI), sunflower seed protein isolate (SUPI), and soybean protein isolate (SOPI) were prepared from defatted peanut meal, defatted pumpkin seed meal, defatted sunflower seed meal and defatted soybean meal. The functional properties including water-absorbing ability (WA), oil-absorbing ability (OA), wetting time (WT), emulsifying ability (EA), emulsifying stability (ES), foaming ability (FA), and foaming stability (FS) of these four kinds of protein isolates were investigated. The results showed that different protein isolates exhibited different functional properties. Compared to the FA of PUPI (3.88 ± 1.69 %), SOPI (7.76 ± 2.04 %), and SUPI (9.33 ± 1.39 %), the FA of PEPI showed the highest value of 18.18 ± 0.97 %. The PUPI exhibited the shortest WT of 11.02 ± 3.13 s and the highest OA of 1.34 ± 0.004 mL/g. Besides, SOPI showed the highest EA value of 100.84 ± 9.69 m<sup>2</sup>/g. Notably, although not all functional properties of PUPI showed the best value, PUPI exhibited the shortest WT and the highest OA value, which makes it a candidate additive in meat products and might improve the OA and palatability of meat products. Moreover, PUPI does not contain chlorogenic acid, which is contained in SUPI, and therefore does not influence the organoleptic and nutritional quality of food products.</strong></p> Dan Gao Anna O. Helikh Zhenhua Duan Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-05-01 2021-05-01 29 1 155 163 10.15421/082116 INFLUENCE OF Se-LACTOALBUMIN ON FUNCTIONAL AND TECHNOLOGICAL PROPERTIES OF SELENIUM-PROTEIN DIETARY SUPPLEMENTS <p><strong>One of the possible options for obtaining health products is the enrichment of food products with protein-selenium complexes, which form the basis of selenium-protein dietary supplements (SPDS). SPDS contain the organic Selenium compounds, which are the products of chemical interaction between Selenium salts and globular whey proteins. Such SPDS can be used not only as a source of the abovementioned nutrient, but also as an emulsifier of dispersed systems. Their introduction into the food recipes should not adversely effect on organoleptic characteristics of their quality, should increase the emulsion resistance, enhance the content of organic selenium, which determines the relevance of these studies. The aim of the article is to study the technological properties of selenium-protein dietary supplements to identify ways of their further use in food technology. The technological properties of selenium-protein dietary supplements are studied, the main factors providing their high values are determined. The water-holding capability of SPDS is obviously detected by increasing the temperature of their colloidal solutions to 90 °C. At SPDS «Neoselen» – 336.8 %, at SPDS «Syvoselen Plus» – 221.4 %. So long as significant part of the protein fraction of SPDS «Syvoselen Plus» is denatured during its production, it is natural that the values of the water holding capacity (WHC) of the additive is lower than SPDS «Neoselen» one. Hence, the smaller the number of proteins with natural technological properties in the additive, the smaller the WHC index value of it. Satisfactory values of fat-retaining (FRA) and fat-emulsifying (FEA) abilities of SPDS are determined, thanks to which theу would show stabilizing and emulsifying properties in food systems. The complex of such technological characteristics is due to the modification of whey proteins during the SPDS production, namely: their interaction with serum enzymes (reductases, oxidases, etc.), Selenium salts, which are both reducing agents and oxidants, pH, temperature, etc. The abovementioned indicators of FRA and FEA can be explained by technological properties of hydrophobic functional groups of SPDS proteins that are presented on their contact surface (-СН<sub>3</sub>, -С<sub>2</sub>Н<sub>5</sub> and so on). The study of moisture-absorbing capacity (MAC) and WHC of SPDS confirm the hypothesis. It became obvious that «Neoselen» in contrast to «Syvoselen Plus» has pronounced functional and technological properties as a result of SPDS experimental research. Thus, the WHC of this additive is 1.5 times higher than in SPDS «Syvoselen Plus» (336.8 ± 3.4 % and 221.4 ± 2.2 %, respectively), the rate of FEA – 11.5 times more (216.5 ± 2.1 % and 16.8 ± 0.9 %, respectively). The recommendations for the SPDS use in a wide range of foods with high nutritional value are developed based on the identified functional and technological properties. Based on the results of research on the functional and technological properties of SPDS, the additives have been recommended for use in dietary food technology as emulsifiers and stabilizers of food dispersed systems and sources of selenium as a functional carcinoprotective and immunomodulatory ingredient.</strong></p> Vladyslav H. Prymenko Anna О. Helikh Tetyana M. Stepanova Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-05-01 2021-05-01 29 1 164 172 10.15421/082114 ELECTROLYSIS OF NaCl SOLUTIONS IN FLOW SYSTEMS <p><strong>The electrolysis of NaCl solutions in flow systems was investigated. It has been shown that in order to minimize the conversion of hypochlorite to chlorate at the anode and the reduction of hypochlorite ions at the cathode, one should perform electrolysis at a minimum stirring rate of the solution relative to the electrodes. </strong><strong>Removal of the membrane from the cell leads to only a slight decrease in the </strong><strong>current efficiency</strong><strong> of sodium hypochlorite in the range of 1-3% and a slight increase in the pH of the solution, which has a positive effect on its stability. </strong><strong>Current efficiency of</strong><strong> chlorates do not change. A positive effect is the reduction of cell voltage, which improves the energy efficiency of </strong><strong>sodium hypochlorite</strong><strong> synthesis.</strong> <strong>With a current load of 2 A and the use of two flow cells at a volumetric flow rate of 8.7 L h<sup>-1</sup>, one can sinthesize a high-purity solution of sodium hypochlorite containing 500 mg L<sup>-1</sup> NaClO and 0.6 mg L<sup>-1</sup> NaClO<sub>3</sub>. The current efficiency of hypochlorite and sodium chlorate is 78 and 0.2%, respectively. Electrochemical reactor with three flow cells with a capacity of 9.2 L h<sup>-1</sup> at a current load of 3 A allows one to continuously produce a solution containing 1000 mg L<sup>-1</sup> NaClO and not more than 6 mg L<sup>-1</sup> NaClO<sub>3</sub>. Created prototypes of electrolyzers have successfully passed the stages of laboratory and experimental tests.</strong></p> Dmitry D. Girenko Alexander В. Velichenko Olesia B. Shmychkova Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-25 2021-04-25 29 1 31 41 10.15421/082111 ADSORPTION OF CO, NI, CU, ZN METAL IONS ON FULLERENE C60 AND ON SINGLE-WALL CARBON NANOTUBES C48 AS A DRIVEN FORCE OF COMPOSITE COATINGS’ ELECTRODEPOSITION <p><strong>Composite electrodeposited films fabricated from aqueous solution of electrolytes that contain ions of metals along with carbon nanomaterial particles such as fullerene C60 were investigated. Results for the cathodic polarization curve showed an increase in charge-transfer resistance. Phase composition analysis for metal films revealed the presence of carbon nanoparticles (CNPs) inside the metal matrix and significant changes in the crystal lattice. As it shown on microphotographies, addition of CNPs changes columnar growth patterns of metallic films to microlayered structure due to passivation of the surface. We assume that CNPs obtain charge in solution by adsorbing metal ions on its surface. </strong></p> <p><strong>In order to prove this hypothesis Density Functional Theory was used for calculation of thermochemical, electronic and structural properties of metal ions complexes with CNPs. Calculated binding energies of the CNP-Me2+ complexes suggests that an adsorption of Co2+, Ni2+, Cu2+, and Zn2+ ions on the surface of fullerene C60 and SWNT C48 is possible and thermodynamically favorable. Binding affinity was found to be significantly stronger when the metal ion was adsorbed onto a surface of SWNT C48, than adsorption to the fullerene C60. With Cu2+ complexes being the most thermodynamically stable, binding affinities were increasing in a row Co2+&lt;Zn2+&lt;Ni2+&lt;Cu2+. Calculated free binding energies showed a good correlation with the band gap, distances between metal ion and a surface of CNP, dipole moments, delocalization of natural bond orbital (NBO) charges, and second ionization potential of metal ions. High values of calculated binding energies between metal ions and CNPs supported the hypotheses proposed here.</strong></p> Valentina V. Tytarenko Eduard Ph. Shtapenko Eugene O. Voronkov Aruna Vangara Vladimir A. Zabludovsky Wojciech Kolodziejczyk Karina Kapusta Sergiy I. Okovytyy Copyright (c) 2021 Днипровский национальный университет имени Олеся Гончара 2021-04-30 2021-04-30 29 1 42 54 10.15421/082108