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Постійне посилання колекціїhttps://dspace.nuft.edu.ua/handle/123456789/7522
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Документ Changes in structural units in dough and bread from wheat flour with the addition of pumpkin cellulose in combination with phospholipids(2023) Shevchenko, Anastasiia; Litvynchuk (Vorontsova), Svitlana; Drobot, ViraUnfavorable ecological and food security situation in the world causes frequent spread of diseases of the gastrointestinal tract. In particular, the number of cases of irritable bowel syndrome is increasing, especially among the young working population. Diet therapy, which includes increasing the amount of dietary fiber in combination with phospholipids, is effective for the prevention of these diseases. A perspective raw material with a high content of dietary fibers is pumpkin cellulose, which can be added to the recipe of bakery products instead of part of wheat flour. The aim of the work was to find the effect of pumpkin cellulose in combination with sunflower lecithin on the conformational changes of the structure of dough and bread from wheat flour and the completeness of assimilation of products with this raw material by the organism. It was established that the infrared spectra of wheat flour, pumpkin cellulose and sunflower lecithin differ in reflection intensity and character. In the process of dough fermentation, the conformational transformations deepened with an increase in the amount of replacement of wheat flour with pumpkin cellulose, and the reflection coefficient increased. For bread samples, the reflectance coefficient was lower compared to dough, but there were almost no differences in the location of the spectra. In general, the biological value of samples of bread with additives was lower than the control sample, however, the high content of dietary fibers in pumpkin cellulose makes it a promising raw material for enriching bakery products with a valuable nutrient and giving bread health properties. The rational amount of replacing wheat flour with pumpkin cellulose is no more than 7 %, taking into account the decrease in the biological value of bread with this raw material.Документ Influence of rice flour on conformational changes in the dough during production of wheat bread(2022) Shevchenko, Anastasiia; Litvynchuk (Vorontsova), SvitlanaThe aim of the work was to determine the influence of rice flour on the conformational transformations in the structure of the dough for the production of wheat bread, which contains lecithin. The fractional composition of proteins showed a higher content of albumin, prolamin and insoluble proteins in wheat flour than in rice flour by 11, 90 and 75%, respectively. The content of globulins and glutelins is more in rice flour by 7 and 183%, respectively, but the composition of glutelins in the studied samples is different. In wheat flour, it is glutenin, which is a gluten protein, forming a heterogeneous mixture of polymers through disulfide bonds of polypeptides. In rice flour, oryzenin is a representative of glutelins. The infrared reflection spectra of wheat and rice flour showed a similar nature of the spectra: the extremes are observed at the same wavelengths, the spec-tra are located parallel to each other and differ only in the intensity of reflection. The spectrum of sunflower lecithin differs significantly due to its different chem-ical composition. Also, at some wavelengths on the spectrum of lecithin, extreme shifts in both short and long wavelength regions are visible. The secondary structure of gluten underwent changes in bread after exposure to temperature by promoting α-helices and β-turns and contributed to the formation of disulfide bonds.Документ Use of rice flour in wheat bread technology(2022) Shevchenko, Anastasiia; Drobot, ViraLast decade is characterized by the increase in the incidence of inflammatory bowel diseases all over the world. Diet therapy, which includes reducing the amount of dietary fiber and including phospholipids in it, is effective in maintaining a stable condition in case of these diseases. A promising raw material with a low dietary fiber content is rice flour, which may be added to the recipe of bakery products to replace part of wheat flour. The aim of the work was to determine the influence of rice flour on the course of the technological process and the characteristics of the dough in bakery products manufacturing, as well as on the quality indicators of bread made from wheat flour, which contains lecithin. Rice flour contains 1.8 times less protein than wheat flour, but this protein is more complete in amino acid composition. The content of dietary fibers in rice flour is 8.5 times lower. The gas-forming capacity of the dough with lecithin separately and in a mixture with rice flour increases by 8.4−18.7 % when replacing 10−40 % of wheat flour. It was established that in the dough sample with lecithin, the amount of formed and fermented sugars increased by 1.2 % and 12.1 %, respectively, compared to the control sample without additives. With an increase in the percentage of replacement of wheat flour with rice flour, the amount of formed sugars increased by 35.2−39.0 %. The amount of fermented sugars also increased by 19.6−31.8 % with an increase in the percentage of replacement. The shape stability of bread slightly improved with the addition of lecithin. However, when adding rice flour, the shape stability of the products decreased by 7.1−26.8 %, as well as the specific volume and porosity of bread.Документ Influence of pumpkin processing products on structural and mechanical properties of dough and bread quality(2021) Drobot, Vira; Shevchenko, AnastasiiaIt was established that the use of pumpkin processing products reduced the gas content due to the influence of the components of this raw material on gluten. The gluten skeleton lost elasticity due to the content of dietary fiber and pectin in pumpkin raw materials, which reduced its ability to retain carbon dioxide. The viscosity of the dough changed under the action of the components of the pumpkin raw material. The shape stability of bread did not change significantly. Along with this, the taste of the products improved, which acquired a pleasant pumpkin hue. The bread crumb was elastic, well fluffed. Bread made with the studied raw materials had good consumer properties.