Матеріали конференцій
Постійне посилання колекціїhttps://dspace.nuft.edu.ua/handle/123456789/7498
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7 результатів
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Документ Determination of Fatty Acid Profile of Sunflower Oil Samples by NMR 1H Spectroscopy(2018) Kovaleva, Svetlana; Mazur, Larisa; Miroshnikov, Oleg; Hutsalo, InnaSunflower oil with a high content of oleic acid (Omega-9) and a sufficiently low content of polyunsaturated linoleic acid (Omega-6) is characterized by a lower nutritional value but greater chemical stability at high temperatures and in the presence of oxidizing agents, therefore, it has several advantages for the food and chemical industries, and also as a raw material for the production of biofuels. The determination of the TAG composition o f oil is very important, because due to selection there is a large number o f sunflower varieties. The spectra o f oil samples extracted from seeds o f various sunflower varieties were investigated by NMR 1H spectroscopy to determine fatty acids composition. This method based on estimation and comparison the proton integral intensities of allylic and bis-allylic CH2 groups with intensity o f glycerol protons that allows to determine the amounts o f these unsaturated fatty acids. Each oil sample obtained has its individual TAG profile determining its physicochemical properties and nutritional value. Method 1H-NMR spectroscopy is rapid and non-destructive, so it is perspective for determination o f oil fatty acid composition.Документ Synthesis of 1,2-dihydrothieno-1λ5-[2,4,1]oxazaphosphine(2018) Kovaleva, Svetlana; Mazur, Larisa; Zinchenko, NataliaДокумент Synthesis of Six-Membered Thiophene-Annelated Heterocycle Containing P and N atoms(2017) Kovaleva, Svetlana; Simurova, Natalia; Mazur, LarisaДокумент Synthesis of Dihydropyrimidine Derivatives by Biginelli's Reaction in student Workshops on Organic Chemistry(2017) Simurova, Natalia; Kovaleva, Svetlana; Mazur, LarisaIn classical student workshops, the attention paid to the synthesis of heterocyclic compounds is very little. This is due to the complexity and duration of most of these syntheses, the low availability of the initial reagents, the difficult isolation and purification the reaction products. Biginelli's reaction, as a method of synthesis of dihydropyrimidones, is attractive to be used in the student workshop on chemistry due to the simple procedure of synthesis, as well as a possibility to vary the reaction conditions and select initial reagents to introduce substituents that may be easily transformed to various functional groups.. Students cannot only get acquainted with the basic experimental methods, but also learn how to apply theoretical knowledge in practice, including monitoring of reactions and analyzing organic compounds by physico-chemical methods.Документ Determination of raw meat freshness by the express method of n ear-IR spectroscopy(2017) Volkov, A.; Litvynchuk (Vorontsova), Svitlana; Kovaleva, SvetlanaWhen raw meat is stored for a long time, many biochemical processes take place inside. As result, new substances, that not typical for fresh meat, are formed. Present of these compounds may be identified by near-IR spectroscopy. If the spectrograph is pre-calibrated, the express method of nondestructive near-IR spectroscopy can be used for objective estimate o f degree o f meat freshness. The use of this method allows to avoid errors in estimation that typical for organoleptic methods.Документ Determination of presence of the water-retainer sodium triphosphate in minced meat with method of near-IR spectroscopy(2017) Melnichenko, Georgii; Hutsalo, Inna; Kovaleva, SvetlanaAddition of sodium triphosphate (E451) to meat semi-finished products improves the moisture-absorbing properties of muscle tissue, but worsens the absorption of calcium by human body. Therefore, content of sodium triphosphate must be controled. This express method of non-destructive IR spectroscopy, provided that the spectrograph has been pre-calibrated, allows to detect objectively the presence o f sodium triphosphate (E451) in minced meat.Документ Fructose-inulooligosaccharide syrops exstraction from chicory(2016) Popova, Inna; Kovaleva, Svetlana; Shulga, SergiiObtaining fructose-inulooligosaccharide syrups from fresh roots or dry powder of chicory for the purpose of its further use in the production of healthy food products.