Master of Science / Department of Food, Nutrition, Dietetics and Health / Edgar Chambers IV / Cooking is part of almost everyone’s daily life. During cooking, recipes are usually used as a guide for home cooks to help them take decisions and get a tasty and appealing food product. Recipes have a great impact on consumers’ behavior and decision making at the kitchen. However, building a recipe requires understanding of the potential user, including explaining to him/her, in layman’s terms, the best way to prepare the food product. Nevertheless, what is the best way to communicate to consumers through a recipe? A qualitative sensory technique that allows collecting data regarding people’s motivations and actions during cooking is required in order to retrieve this information. The technique needs to allow data collection about the motivations, and the actions inspired by these. Recipes can use these motivations and actions to communicate to recipe users. This research proposes the use of the Think Aloud method, a technique that has not been used on sensory research, as a technique that can meet these goals. The objective of this study was to develop and evaluate different recipe styles for the preparation of doughs by understanding and using people’s descriptions, techniques and preparation terms through the application of the Think Aloud technique. Two qualitative studies were performed with wheat dough preparers (n=43) recruited in Manhattan, KS and corn dough preparers (n=50) recruited in Guadalupe, Costa Rica. During the interviews, participants verbalized the process of preparing the doughs, as well as their decision-making process through the Think Aloud technique. Results showed that participants provided enough data by thinking aloud. It was observed that the use of the Think Aloud method allowed them to be aware of texture characteristics in the dough. The ready doughs were mainly described as not sticky, soft and pliable. The most common techniques used to make the doughs included stirring, pushing/pressing/squeezing, and incorporate all together. Five recipes were written based on these descriptions. Three of the recipes included a step-by-step numbered format with a different amount of detail: not detailed, very detailed, and detailed recipe. The other two formats, both based on the detailed recipe, included a paragraph form recipe and a recipe with images. Wheat and corn recipes were validated in two online surveys (per study, n=300) where respondents evaluated the easiness, likeability, likelihood of using the recipe, helpfulness of the format, and amount of information. Overall, respondents considered the recipe with images easier and more helpful. The very detailed recipe was considered more difficult, less helpful and was liked less than the other recipes. Understanding and identifying the words and techniques people use at the kitchen represent a useful tool that can be used to communicate to other preparers how to make a food product. The Think Aloud technique represents a useful technique to collect information regarding consumers’ actions and motivations. The data collected through the application of the technique allowed building different recipe styles to communicate to consumers how to prepare a food product.

Massas de pães são preparadas a partir da mistura de farinha de trigo, água, sal e fermento. Ao entrar em contato com a água e sofrer amassamento mecânico, a farinha de trigo tem a propriedade, quase exclusiva, de produzir uma massa coesa e viscoelástica, por conter proteínas formadoras de glúten. O processo de mistura pela qual passam as massas de pães, seguido de etapas de fermentação é fundamental para o bom desenvolvimento da massa e qualidade final do pão acabado. As análises de textura (back extrusion e extensibilidade) e volume, em massa crua de pão, podem avaliar o desenvolvimento e a qualidade de massas, eficácia de formulações e a eficiência dos ingredientes usados na melhoria do desenvolvimento da massa e do pão acabado. O projeto teve como objetivo elaborar formulações de massas de pães por diferentes processos de fermentação e testá-las através das análises de textura por extensibilidade e back extrusion, e volume sendo esta última sugerida para esse fim. Também foi testada a substituição de parte da farinha de trigo por triticale. As formulações utilizadas incluíram diferentes métodos de preparo de massas, como método direto e indireto, sendo nove formulações propostas. Pelo método direto o fermento seco instantâneo é adicionado diretamente à farinha e em seguida os demais ingredientes da formulação são adicionados, em uma única fase, seguido das etapas de mistura e fermentação. Já para as massas elaboradas de forma indireta, preparou-se uma massa fermentada denominada esponja, que foi feita com parte da farinha e da água e todo fermento seco instantâneo da formulação, deixada fermentar durante uma hora. Em uma segunda fase, a esponja foi adicionada ao restante dos ingredientes, seguido das etapas de mistura e fermentação. Os resultados das análises mostraram as diferenças do comportamento reológico de massas preparadas por diferentes processos fermentativos e a influência dos ingredientes como, o iogurte, adicionado por conter substâncias que são encontradas em pães fermentados naturalmente, resultando no aumento dos parâmetros reológico das massas contendo esse ingrediente. / Dough of bread are prepared from the mixture of flour wheat, water, salt and yeast. By contacting the water and suffer mechanical kneading the flour has property, almost exclusively, to produce a cohesive dough and viscoelasticity, which contain gluten-forming proteins. The mixing process through which runs the dough of bread, followed stages of fermentation is essential for the dough development and final quality of the finished bread. The analysis of texture (back extrusion and extensibility) and the volume dough of raw bread, can measure the development and quality of dough, formulation\'s effectiveness and efficiency of ingredients used in enhancing development of dough and the finished bread. The project had the object to develop formulations of doug for different fermentation processes and test them through the analysis of texture by extensibility and back extrusion, the latter being suggested for this purpose. Also was tested the substitution of part of the flour for triticale. The formulations used included different methods of preparation of dough, as a direct and indirect method, being nine formulations proposed. Through direct method the instant dry yeast is added directly to flour and then other ingredients formulation are added in a single phase, followed by stages of mixing and fermentation. To the dough produced in an indirect way, has been prepared a fermented dough called sponge, which is made with part of the flour and water and all instant dry yeast used in the formulation, and left to ferment for one hour. In a second phase, the sponge was added to the rest of the ingredients, followed the steps of mixing and fermentation. The analysis results showed the differences of rheological behavior of doughs prepared by different fermentation processes and the influence of ingredients as yogurt, added to contain substances that are found in naturally fermented breads, resulting in the increase of rheological parameters of the dough containing this ingredient.

<p>U radu je ispitana interakcija tri vrste komercijalnih prehrambenih vlakana (Fibrex, inulin HPX i inulin GR) sa strukturnim komponentama hlebnog testa. Na različitim pH vrednostima (pH 7, pH 5, pH 4 i pH 3) ispitane su fizikohemijske osobine vlakana, pri čemu Fibrex ima najveći kapacitet zadržavanja vode od 421% dok inulin GR najmanji od svega 4.2%. Na osnovu reolo&scaron;ke osobina testa sa vlaknima u količini od 5 i 10% dobijen je uvid u interakciju vlakana sa proteinskim kompleksom i klajsterisanim skrobom. Reolo&scaron;ke osobine hlebnog testa zavise od količine i vrste inkorporiranih vlakana&nbsp; dok pH vrednost vode za zames ima mali uticaj na ove pokazatelje. Dodatkom 5 i 10% fibrex-a i inulina HPX dobija se hleb dobrog kvaliteta, sa značajnim padom svarljivih ugljenih hidrata i promenjenog nutritivnog sastava koji ima osobine funkcionalne hrane pri čemu fibrex tamni boju a inulin HPX i GR vizuelno ne menja boju hleba u odnosu na hleb bez vlakana. Statistička obrada podataka je potvrdila pozitivan uticaj vlakana na testa u zamrznutom stanju. Koeficijenti diskriminacije pokazuju da je najveći uticaj vlakana na zavr&scaron;nu fermentaciju testa je posle 1 dana (199.006 i 5.739), a pozitivan uticaj vlakana na zapreminu hleba izražen je posle 30 dana (9.416) a na kvalitet sredine posle 60 dana (.841). Termodinamičkim merenjima kinetike zamrzavanja/odmrzavanja testa sa vlaknima utvrđeno je da inulina GR doprinosi skraćenju postupka &scaron;to potvrđuje koeficient determinacije R2 (0.966 i 0.981) dok testo sa fibrexom ima najmanji koeficijent determinacije R2 (0.939 i 0.951) &scaron;to pokazuje da ovo vlakno najlo&scaron;ije utiče na kinetiku zamrzavanja/odmrzavanja. Kinetika zamrzavanja/odmrzavanja može se definisati matematičkim modelom koja odgovara jednačini sa kvadratnim polinom , odnosno jednačini za nestacionarni temperaturni profil sa kvadratnim članom Y= b₀+b₁^*X +b₂^*X².</p> / <p>The interaction of three different commercial<br />fibers (Fibrex, inulin HPX and inulin GR) with<br />structural elements of bread dough was tested.<br />Physico/chemical fiber characteristics at<br />different pH values point that the greatest<br />water binding capacity (421%) is attributed to<br />fibrex, contrary to the value of 4,2%<br />experienced for inulin GR. Rheology of dough<br />containing 0 to 10% of either fiber type proved<br />the insight in the interaction between fibers<br />and proteins and also fibers and starch gels.<br />Dough rheology is influenced the most by fiber<br />characteristics and incorporated quantity,<br />contrary to pH value of water at mixing stage.<br />Statistical data interpretation proved the<br />positive contribution of fibers on dough at<br />freezing<br />Discrimination coefficients are confirming that,<br />on the whole, the greatest influence fibers have<br />on final proof after1 day of freezing (199.006<br />and 5.739) and their beneficial influence is<br />experienced after 30 and 60 days of freezing on<br />bread volume (9.416) and bread crumb quality<br />(0.841), respectively. Thermodynamic<br />measuring of freezing/thawing kinetics of<br />dough containing fibers point that inulin GR is<br />beneficial in shortening the procedure,<br />confirmed by values for determination<br />coefficient R&sup2; (0.966 and 0.981), contrary to the<br />contribution of Fibrex where the smallest<br />values for those coefficients were experienced,<br />R&sup2; (0.939 and 0.951 proving that fibrex is not<br />contributing to the freezing/thawing kinetics.<br />Freezing/thawing kinetics can be adequately<br />defined by the mathematical model of square<br />polynomial, i.e. equation for the non stationary<br />temperature profile with square Y= b₀+b₁^*X +b₂^*X².</p><p>Data presented in this thesis show that,<br />understanding interactions between fibers and<br />dough structure, by the addition of 5 or 10% of<br />either Fibrex or inulin HPX, high quality bread<br />attributed with a significant decrease of<br />digestible carbohydrates and modified nutritive<br />pattern accompanied with attributes of<br />functional food can be made, while Fibrex is<br />adversly contributing to crumb colour contrary<br />to inulin HPX and GR.</p>

No description available.

Nine 1B/1R translocated soft red winter wheat (SRWW) varieties and six non-1B/1R varieties from two crop years (1995-1996 and 1996-1997), grown in two Virginia locations (Warsaw and Blacksburg), were studied to evaluate the effects of the 1R rye chromosome on soft wheat flour quality and baking performance. The presence of the 1B/1R chromosomal translocation in wheat has been reported to provide disease resistance, but produce sticky doughs. The 1995-1996 and 1996-1997 SRWW flours were subjected to farinograph analysis and dough stickiness testing. Dough stickiness was determined by the Schwarzlaff-Shepherd Dough Stripping Method. Wheat samples from 1995-1996 were also analyzed for protein, ash, and moisture content, alkaline water retention capacity (AWRC), cookie diameter, tensile stress and strain, and by ¹³C nuclear magnetic resonance (¹³C-NMR) spectroscopy techniques. Significant (p = 0.0001) negative correlations were found between AWRC and cookie diameter of SRWWs grown in Warsaw and Blacksburg. Location was found to exert a significant effect on AWRC, cookie diameter and stickiness (p < 0.05). Farinograph data revealed that mixing characteristics of SRWW were affected significantly by variety, crop year and location (p < 0.05). In some cases the 1B/1R varieties had lower breakdown rates, longer departure times (DT) and lower mixing tolerance index (MTI), than their non-1B/1R counterparts. There was a significant difference (p = 0.0133) in the stickiness of 1B/1R and non-1B/1R samples from Blacksburg. However no such difference was found in the corresponding Warsaw samples (p = 0.9826), indicating that location exerted a significant effect on stickiness. Two flour samples exhibiting stickiness (one with and one without 1B/1R) and two non-sticky samples (one with and one without the 1B/1R) were fractionated into gluten, starch and water-solubles (WS) in order to determine if the sticky dough factor resided in the 1B/1R and / or non-1B/1R WS. The peel time of the interchanged samples, as in the case of 'Massey' flour combined with the WS from VA52-22, increased to 79 seconds from the 30 seconds originally observed in the Massey flour. However when gluten and starch fractions from a non-sticky, non-1B/1R sample,VA54-21, were mixed with WS from VA54-211 (sticky, 1B/1R), the peel time went from 18 in the original flour to 8 seconds. Tensile measurements showed dough stress was not significantly affected by the presence or absence of 1B/1R (p = 0.7057). However, dough strain was lower in 1B/1R translocated SRWWs (p = 0.0048). A ¹³C-NMR spectra failed to show differences amongst selected 1B/1R and non-1B/1R dough samples. Proton relaxation time (T1-rho-[H]) - a ¹³C-NMR technique, indicated that water did not exert a significant influence on the molecular dynamics within the dough samples of Massey (non-1B/1R), VA54-211 (1B/1R) and VA52-22 (1B/1R). However, the non-sticky, non-1B/1R sample (VA54-21) had a higher proton relaxation time at 62 ppm which may indicate the size of starch-protein particles in VA54-21 doughs were larger and less flexible than in the other three doughs. / Ph. D.

The merits of fortifying baked products such as biscuits, chocolate cakes, muffins, and yeast rolls with non-fat dried milk solids at six concentrations were compared. Baked products were used because the majority of older people consume fairly large quantities of them, and this group of people needs added milk in their diets. / Master of Science

En América Latina, existe un 49% de jóvenes que están dispuestos a probar nuevas experiencias, nuevos e inusuales sabores según el estudio realizado por la irlandesa Kerry, especializada en Taste & Nutrition y publicado en “Taste Charts 2019 Latam”. Es por ello que un grupo de amigos al ver la necesidad que existe en el sector de postres decide crear a The Cookie Dough Company. Un emprendimiento que tiene como objetivo ofrecer productos de pastelería, cuya base es una de masa de galleta comestible, acompañada de diferentes sabores, los cuales están inspirados en diferentes frutas y postres tradicionales de la pastelería peruana e internacional, dando ello como resultado una primera línea de productos que incluye diferentes sabores. Estas combinaciones permiten que se tenga un equilibrio entre sabores dulces, agrios y amargos. Además, dado que nos encontramos en una tendencia por cuidar el medio ambiente, se ofrece los productos en envases de vidrio, los cuales pueden ser reciclados o reutilizados permitiendo que se disminuya la contaminación ambiental, el cual es un factor importante para todo consumidor en la actualidad, ya que valoran más a las empresas eco friendly, generando que tengamos una imagen positiva para los clientes. Dichos productos están dirigidos para hombres y mujeres jóvenes - adultos que sean amantes de los postres, busquen darse una pausa dulce y estén dispuestos a probar nuevos productos/sabores teniendo la opción de poder adquirir una cookie dough en plataformas virtuales como Facebook e Instagram. / In Latin America, there are 49% of young people who are willing to try new experiences, new and unique flavors. According to the study carried out by the irish Kerry, specialized in Taste & Nutrition and published in “Taste Charts 2019 LATAM”. Therefore, a group of friends realized that there is a need in the dessert sector and decided to create The Cookie Dough Company. An entrepreneurship that has as purpose to offer pastry products whose base is edible cookie dough, accompanied by different flavors which are inspired in different fruits and traditional desserts of peruvian and international pastry, resulting in a front line of products that includes different flavors. These combinations allow a balance between sweet, sour and bitter flavors. In addition, since the The Cookie Dough Company are in a trend to care the environment, our products are offered in glass containers that can be recycled or reused, allowing environmental pollution to decrease, currently it’s an important factor for every consumer because they value eco friendly companies more, generating a positive image for our customers. These products are targeted to young men and women - adults who are willing to try new products / flavors having the option of being able to purchase a cookie dough on virtual platforms such as Facebook and Instagram. / Trabajo de investigación

Master of Science / Department of Grain Science and Industry / Hulya Dogan / Viscoelastic wheat flour doughs are renowned for their ability to produce high quality aerated bread products. Dough exhibits extremely complex rheological properties which makes it capable of occluding and retaining gas cells. The ability of these bubbles to resist failure and remain stable throughout the proofing and baking process is critical to final bread structure and volume. Understanding these factors is important when creating the distinct structural and textural characteristics that consumers desire in baked products. In this study, a method was established for using X-ray microtomography (XMT) to study the microstructure of proving dough as well as bread made from three very different wheat flours. Doughs were prepared according to AACC Method 10-10B optimized straight-dough bread-making method. Sections from unproofed (0 min), underproofed (20 min) and optimally proofed (40 min) doughs were carefully cut and frozen at –80°C. Baked loaves were also prepared following standard test bake procedures. Small specimens were cut from two locations of both the proofed and baked loaves prior to microstructural analysis. A total of 96 dough and bread samples were scanned using a high resolution desktop X-ray micro-CT system Skyscan1072 (Skyscan, Belgium) consisting of an X-ray tube, an X-ray detector and a CCD-camera. X-ray images were obtained from 137 rotation views through 180° of rotation. Hundreds of reconstructed cross sectional images were analyzed using CTAn (v.1.7) software. 3-D analysis of the bubbles indicated that average dough void fractions increased dramatically over proof time from 30.9% for the unproofed dough (0 min) to 62.0% and 74.5 % for the underproofed (20 min) and optimally proofed (40 min) doughs respectively. Oven spring caused further expansion in the baked loaves which increased average void fraction to 84.3%. Gas cell size distributions were largely skewed to the right and shifted in that same direction as processing time increased. Differences in gas cell size seen among flour varieties were largely due to variations in the size of the largest cells caused by coalescence.

Master of Science / Department of Grain Science and Industry / Hulya Dogan / Kansas is the top wheat-producing state, providing about 1/5 of the yearly wheat crop in the U.S. Therefore, the quality of wheat grown in Kansas is a primary concern of the milling and baking industry. Quality of wheat flour is measured through analysis of protein, dough rheology, and baked product characteristics. This study characterized four commonly-grown Kansas hard red winter wheat cultivars chosen to span the largest possible range of protein contents and baking qualities. Flour protein content and moisture was determined by NIR, and composition was assessed using SE-HPLC. Dough empirical rheological and mixing characteristics were determined by farinograph and mixograph recording dough mixers. Rheological measurements of fundamental dough properties were performed through strain sweeps, frequency sweeps, temperature sweeps, creep-relaxation, and stress relaxation on a rheometer. All cultivar flours were baked to assess baking quality through evaluation of loaf volume, texture profile analysis (TPA), C-cell, and x-ray microtomography (XMT). Overley and Karl 92 have the two highest protein contents, respectively, and are not significantly different in percent of unextractable polymeric protein (UPP). Generally, cultivars with higher protein and percent UPP (Overley and Karl 92) gave larger loaves, much more expanded air cells, thinner cell walls, greater void fractions, and better mixing properties. Lower TPA firmness was found for Overley, corresponding with its larger XMT fragmentation index, existence of large air cells, and high void fraction. In contrast, 2137 gave the lowest XMT fragmentation index, low void fraction, larger cell wall thicknesses, and a significantly firmer (P< 0.05) crumb structure. Protein content was found to have an inverse relationship with the elastic nature of dough in fundamental rheological measurements since small amplitude measurements generally do not give good correlations to baking quality. Stress relaxation gave the most useful information about flour quality through its relaxation spectra. Flours with high total polymeric protein percentages could be identified through their higher relaxation spectra. Starch gelatinization properties of the flours were different for RVA and rheometer temperature sweeps. All of these tests have helped characterize the four Kansas wheat cultivars chosen for this study.

By-products of fruit, cereal and vegetable processing are often regarded as waste while they contain significant amounts of dietary fibre and phytochemicals that can positively contribute to the human diet when reused as food ingredient. The application of fibre from by-products in baked goods could increase the sustainability of the processing chain but is usually associated with changes in product characteristics, such as lower volume, denser structure and increased hardness. In the current study, the interactions of fibres from by-products and wheat macromolecules were analysed in muffins, starch slurries and wheat doughs. The three selected fibres differed significantly in their chemical composition and technofunctional properties. In muffins wheat flour replacement by apple fibre was assessed by rheological measurements of batter and determination of product characteristics. Water proportion adaption based on batter viscosity to create isoviscosity was evaluated as a promising method to develop muffins with satisfying characteristics, where a wheat flour replacement of 30 % is suggested. The addition of apple fibre influenced starch gelatinisation in muffins during baking as indicated by the results of pasting experiments and in vitro starch digestion. Starch slurries with apple and wheat fibre were analysed in pasting experiments. Soluble dietary fibre, mainly pectin, strongly influenced the pasting profile of wheat starch, in comparison to insoluble dietary fibre, that acted as an inert filler and did not interact with the starch. Wheat doughs with fibre from by-products were analysed for rheology, texture and microstructure. The gluten development was negatively influenced by the fibres, which resulted in less extensible doughs. Soluble dietary fibre resulted in increased dough stickiness and limited dough handling at high application levels. It can be reasoned that dough with 10% fibre from by-products would produce products with satisfying characteristics, whereas higher application levels cannot be recommended without using additives to increase the gluten strength. Fibres from by-products are suitable wheat flour replacers in bakery products, where the negative effects of the high water binding capacity of the fibre, can be partly balanced by water proportion adaption, especially in products were gluten development is not that dominating for product structure, like in muffins or cakes. / Nebenprodukte der Obst-, Getreide- und Gemüseverarbeitung werden oft als Abfall betrachtet, wobei sie signifikante Gehalte an Ballaststoffen und sekundären Pflanzeninhaltsstoffen aufweisen, und bei der Verwendung als Lebensmittelzutat positiv zur menschlichen Ernährung beitragen können. Die Anwendung von Fasern aus Nebenprodukten in Backwaren könnte die Nachhaltigkeit der Verarbeitungskette erhöhen, ist jedoch mit Änderungen der Produkteigenschaften verbunden, wie verringertes Volumen, dichtere Struktur und erhöhte Härte. In der vorliegenden Studie wurden die Wechselwirkungen von Fasern und Weizenmakromolekülen in Muffins, Stärkesuspensionen und Weizenteigen analysiert, wobei sich die drei ausgewählten Fasern in ihrer chemischen Zusammensetzung und ihren technofunktionellen Eigenschaften unterschieden. In Muffins wurde die Mehlsubstitution durch Apfelfaser anhand von Teigrheologie und Produkteigenschaften analysiert. Die Anpassung des Wassergehaltes basierend auf der Teigviskosität wurde als vielversprechende Methode zur Entwicklung von Muffins mit akzeptablen Eigenschaften bewertet, wodurch ein Mehlersatz von 30% möglich war. Die Zugabe von Apfelfasern beeinflusste die Stärkeverkleisterung in Muffins, wie durch die Ergebnisse von Verkleisterungsexperimenten und In vitro-Stärkeverdauung gezeigt wurde. Stärkesuspensionen mit Apfel- und Weizenfasern wurden auf ihr Verkleisterungsverhalten analysiert. Lösliche Ballaststoffe beeinflussten das Verkleisterungsprofil von Weizenstärke im Vergleich zu unlöslichen Ballaststoffen, die als inerter Füllstoff fungierten und nicht mit der Stärke in Wechselwirkung traten. Weizenteige mit Fasern wurden auf Rheologie, Textur und Mikrostruktur untersucht. Die Glutenentwicklung wurde durch die Fasern negativ beeinflusst, was zu weniger dehnbaren Teigen führte. Lösliche Ballaststoffe führten zu einer erhöhten Teigklebrigkeit. Weizenteig mit 10% Faser besitzt zufriedenstellenden Eigenschaften, während höhere Fasermengen nicht zu empfehlen sind, ohne Zusatzstoffe, um die Glutenfestigkeit zu erhöhen. Fasern aus Nebenprodukten sind geeignet als Mehlersatz in Backwaren, wobei die negativen Auswirkungen der hohen Wasserbindekapazität der Faser teilweise durch Wasseranpassung ausgeglichen werden können, insbesondere in Produkten, bei denen die Glutenentwicklung nicht die Produktstruktur dominiert, wie in Muffins oder Kuchen.