Статті
Постійне посилання колекціїhttps://dspace.nuft.edu.ua/handle/123456789/7522
Переглянути
14 результатів
Результати пошуку
Документ Influence of physicochemical parameters of the alkaline pretreatment on the viscosity of wheat straw slurries(2021) Sydorenko, Vitalii; Obodovych, Oleksandr; Grabova, Tetyana; Podobiy, OlenaThe paper presents the results of the influence of physicochemical parameters of the alkaline pretreatment on the viscosity of wheat straw slurries on its rheological properties. The authors consider the coefficient of apparent viscosity as a complex indicator of wheat straw slurries pretreatment process which depends on the structure and physicochemical properties of system components, thermal parameters of the process (temperature, dispersion, and concentration of dispersed phase, shear flow rate). A wheat straw slurries with a solids content of 10…15% were chosen as the object of research. As a result of research, rheological viscosity and fluidity were constructed for these slurries in the range of shear rates from 1 to 437.4 s-1. The value of viscosity as a function of shear rate for a solids concentration of 10, 12, and 15% w. is given.Документ Physico-chemical and rheological indicators of meat pates with corn starch suspensions prepared with electrochemically activated water(2023) Marynin, Andriy; Shpak, Vladyslav; Pasichnyi, Vladyslav; Sviatnenko, Roman; Shubina, YevgeniaThe aim of the study was to determine the influence of electrochemically activated water application on the rheological properties of corn starch suspensions and pates prepared with them. Corn starch suspensions were prepared on artesian water, which was activated by electrochemical treatment on a diaphragm electrolyzer. Physico-chemical characteristics of electrochemically activated water were determined using a Palintest 7500 photometer. Morphological studies of starch granules were carried out by scanning electron microscopy, and granulometric composition was determined by laser diffraction method. The rheological indicatorss of starch suspensions and pates were studied using a Kinexus Pro+ rheometer. The physico-chemical characteristics of electrochemically activated water except pH met the requirements of the European Parliament and Council Directive on the quality of water intended for human consumption. The water absorption capacity of starch when preparing its suspensions on a catholyte (obtained by passing a direct electric current through water in the cathode chamber of an electrolyzer) decreased by 26%, and when prepared on an anolyte (obtained in the process of water oxidation reactions on the anode) increased by 18%. The moisture holding capacity of hydrated starch decreased by 10% when using catholyte, and increased by 36% when using anolyte. Electrochemically activated water had a significant effect on the rheological characteristics of starch suspensions: with an increase in the percentage of complex shear strain, the shear stress increased proportionally for samples of suspensions made on electrochemically activated water. The viscoelastic properties of starch suspensions prepared using electrochemically activated water both at 25 ℃ and at 68 ℃ tended towards an ideally elastic gel, that is, they had more elastic structure than the control samples. Under the action of shear deformation, the elastic properties were lost, while the suspensions acquired viscosity (phase angle values increased). The maximum value of the moisture binding capacity of pates was observed when using a starch suspension prepared on anolyte. The best values of rheological characteristics of pates were obtained when using starch suspension with 2% starch prepared on anolyte. Electrochemically activated water had a significant effect on the physicochemical and rheological properties of semi-finished products, in particular corn starch suspensions, and pates prepared with them, and contributed to better structuring of the studied food systems.Документ Зміна реологічних властивостей суспензії лікарських і косметичних засобів під час подрібнення в бісерних млинах(2023) Грінінг, Катерина Робертівна; Губеня, Олексій ОлександровичРеологічні властивості суспензій рицинової олії та суспензії для косметичних засобів на її основі під час подрібнення в бісерному млині у межах дослідженого діапазону залежно від тривалості вимірювань не змінюються. Залежність вʼязкості від швидкості зсуву під час подрібнення суспензії має степеневий характер і підтверджує неньютонівський характер. В’язкість змінюється логарифмічно для всіх значень температури і становить 1,011 Па‧с для рицинової олії та 2,127 Па‧с для суспензії на її основі. Суспензія має у 2,1 раза більшу в’язкість порівняно з рициновою олією, що пояснюється високим вмістом сухих речовин (40%) та збільшенням новоутвореної площі під час надтонкого подрібнення. Evaluation of rheological characteristics is an integral and important part of research on the creation of soft dosage forms, which affect such technological parameters of the systemas emuls ification, transportation, and also ensure proper consumer properties (spreadability, uniformdistribution and fixation on the surface. The rheological properties of drug and cosmetic s uspensions during grinding in a bead mill were studied. The suspension was prepared according to the recipe: pigment iron oxide red 120 — 40% and castor oil — 60%. The duration of grinding is 45 minutes (2700 s). During grinding, the bead mill chamber was sampled every 5 minutes (300 s) and the shear stress at different values of the shear rate was measured. Rheological characteristics – viscosity and shear stress were studied on a rotary viscometer. The flow curves of castor oil and suspension were constructed and it was established that, based on it, within the studied range, the nature of the flow does not change depending on the duration of the measurements. The analysis of the suspension curve during grin - ding revealed features that explain the formation and the structure formation. The dependence of effective viscosity on the shear rate when grinding the suspension has a power-law character and con - firms the non-Newtonian nature and is defined as a linear plastic body. The temperature dependence of the effective viscosity of castor oil and suspension was compared. The viscosity of both tested substances varies logarithmically for all investigated temperature values and is equal to 1,011 Pa‧s for castor oil, which corresponds to the value in the manufacturerʼs specification, and 2,127 Pa‧s for the suspension based on castor oil. The suspension under study has 2,1 times higher viscosity compared to castor oil, according to the high content of solids (40%) and the increase in the newly formed area during the ultrafine grinding process. The obtained results of research on the rheological properties of the suspension allow us to monitor and adjust the parameters of ultrafine grinding process for achieving the required product quality.Документ Wheat arabinoxylans: structure, extraction and characteristics(2019) Kaprelyants, Leonyd; Pozhitkova, Liliia; Velichko, Tatiana; Bilyk, OlenaWheat bran is a by-product of conventional milling and is commercially available in large quantities. Beside its high content of dietary fibre it contains proteins, minerals as well as vitamins and others biologically active components. In recent years, there have been designed different approaches to incorporation of wheat bran in food products to optimize composition or physiological effects. Industrial wheat bran is one of the most representative available hemicellulosic rich products. Arabinoxylans are the predominant non-starch polysaccharides found in the structural matrix of cell walls in wheat grains, being present in large quantities in wheat bran, accounting for up to 15-20% of its composition. Their physicochemical properties define their functionality which can be beneficial in cereal-based products such as bread, where their addition could enhance the gluten matrix responsible for the aerated structure and quality of bread. A potential source of аrabinoxylans is its extraction from the wheat bran based low value as an end product of the milling process. The benefits of extraction are twofold, to enhance nutritional value wheat by-product reducing fibre content and produce a high value product for use as a functional ingredient in the bread making industry and in others foods. Extraction of arabinoxylans involves many possibilities for obtaining substances with different physicochemical properties, giving opportunity for integration in functional foods. Functional behaviour includes viscosity, water solubility, water holding capacity, oxidative cross linking and gel formation and foam stability, which are all reported to be affected by the physicochemical properties of arabinoxylans, as well as chain to chain interactions with other polymers and with the solvent. Currently no commercial supply of arabinoxylans is available in sufficient quantities to conduct functionality trials; therefore the objective of the current work was to study the feasibility of extracting arabinoxylans from the bran for future developing and scaled-up extraction process based on the analyzed methods and approachesДокумент Effect of natural ingredients on the structural-mechanical and physicochemical properties of ice cream mixes(2022) Sapiga, Victoria; Polishchuk, Galyna; Tomczynska-Mleko, Marta; Mleko, Stanislaw; Terpiłowski, Konrad; Pérez-Huertas, SalvadorIn modern nutrition, there is an increased consumer demand for low-calorie products. Meanwhile, ice cream of classic types is a product with a high fat content (10–16%). Therefore, there is a high demand on production of new types of low-fat or non-fat ice cream. An ice cream is treated as a low-fat product when it contains below 5% of fat. In the process of modifying ice cream recipes, the main task is to obtain a product with a characteristic creamy consistency and high resistance to melting, which is ensured by maintaining a certain balance between the content of free and bound water, the specified values of the cryoscopic temperature and other physicochemical parameters.Документ Functional and technological properties of oat beta-glucan in acidophilic-whey ice cream(2022) Mykhalevych, Artur; Sapiga, Victoria; Polishchuk, Galyna; Osmak (Fedchenko), TetianaДокумент Rheological characteristics of water solutions of guar gum(2020) Bakhmach, Volodymyr; Vovkodav, O.; Vovkodav (Obizyuk), NataliaRheological characteristics of water solutions of guar gum are studied. Mayonnaise is an oil-in-water type emulsion consisting of vegetable oil (50-85%), egg yolk (5-10%), vinegar, salt and seasonings. The emulsion is stabilized by egg yolk phospholipids. Products with a lower content of oil (<50%) may content thickening agents such as starch, pectin, agar-agar, carboxymethylcellulose, milk proteins. Wide possibilities for using guar gum exist in the mayonnaise technology. Stability at low pH values and low salt content, high viscosity solutions at low shear rate and pseudoplastic characteristics make attractive using systems for stabilization. Because of pseudoplastic characteristics, that are inherent to guar gum, the solutions have fluidity and at the same time stay on salads. Low concentrations of guar gum provide high viscosity of sauces at acidic and neutral pH values. Viscosity of solutions is also stable to temperature changes and withstands different long-term storage conditions. Guar gum may be used for partial replacement of starch, stability improvement and adding a feeling of fullness in the mouth. It is established that growth of concentration of guar gum in an aqueous solution causes gradual increase of the flow index. It should also be mentioned thatflow index values are lower than one for all the concentrations, it is typical for pseudoplastic solutions.Документ Research consistency of disperse systems by gravitational penetration method(2013) Guts, Viktor; Polumbryk(Ivanova), ManyefaMethods for determining the consistency of food need to be improved, simplified experimental equipment, the development of a single indicator measurements. Experimental researches performed on a gravitational penetrometer. Mathematical modeling is made from the analysis of motion of the gravitational force penetrometer. On the basis of a theoretical research relating to the instrument design a simple method of determining the consistency of concentrated fluid food disperse systems has been developed. The mathematical model of calculating the resistance of a free-fall penetrometer immersion as the product consistency characteristics has been drawn and explained on a theoretical basis. The model of a free-fall penetrometer motion through a layer of the product, which is based on a second-order differential equation, has been set. The solution has been obtained by the boundary conditions. To simplify the research its differentiation has been completed and the penetrometer immersion speed has been determined. The results of the research are recommended to be used for various consistency properties of food dispersed systems. Методи визначення консистенції їжі потребують вдосконалення, спрощеного експериментального обладнання, розробки єдиних вимірювальних показників. Експериментальні дослідження, проведені на гравітаційному пенетрометрі. Математичне моделювання проводиться з аналізу руху пенетрометра сили тяжіння. На основі теоретичного дослідження, що стосується конструкції приладу, розроблений простий метод визначення консистенції концентрованих систем з диспергуванням харчової рідини. Математична модель обчислення опору занурення пенетрометра вільного падіння як характеристики консистенції виробу була розроблена та пояснена на теоретичній основі. Встановлено модель руху пенетрометра вільного падіння через шар виробу, що базується на диференціальному рівнянні другого порядку. Розчин отриманий за граничними умовами. Для спрощення дослідження його диференціація завершена і визначена швидкість занурення пенетрометра. Результати досліджень рекомендується використовувати для різних властивостей консистенції харчових дисперсних систем.Документ Дослідження впливу шроту льону на якість хліба(2015) Дробот, Віра Іванівна; Іжевська, Орися Петрівна; Бондаренко, Юлія ВікторівнаВ матеріалах статті розглянуто можливість використання шроту льону в рецептуріт пшеничного хліба для збагачення виробів фізіологічно-функціональними інгредієнтами. Результати досліджень свідчать, що внесення шроту льону покращує склад рідкої фази тіста, що сприяє дещо інтенсивнішому бродінню цих зразків тіста. Встановлено, що доцільно в рецептурі хліба проводити заміну пшеничного борошна шротом льону в кількості до 5 %, більше дозування шроту супроводжується погіршенням органолептичних показників якості виробів, зниженням їх об’єму та формостійкості. The article discusses the possibility of using flax meal in the recipe wheat bread for the enrichment of products of physiologically functional ingredients. The results show that the introduction of flax meal improves the composition of the liquid phase of the dough, which contributes to a slightly more intense fermentation of these samples test. Found that it is desirable in the bread recipe to replace wheat flour with flax meal, in an amount up to 5 %, increase the dosage of the meal is accompanied by a deterioration of the organoleptic indicators of the quality of products, reduction of their volume and dimensional stability.Документ Дослідження структурно-механічних властивостей тіста зі шротом насіння льону(2015) Дробот, Віра Іванівна; Іжевська, Орися Петрівна; Бондаренко, Юлія ВікторівнаВ матеріалах статті встановлено, що при використанні шроту льону погіршуються пружно-еластичні властивості тіста внаслідок зменшення в ньому клейковини, зниження її гідратаційної здатності та еластичності. Складові шроту льону внаслідок високої водопоглинальної здатності значно підвищують в’язкість тіста. Це зумовлює зниження газоутримувальної здатності та зменшення об’єму ферментованого тіста, що потребує застосування технологічних заходів для забезпечення необхідної якості виробів.