Bread is widely consumed and is an ideal vehicle for nutraceutical delivery. Sorghum bran, flax, and inulin are nutraceutical ingredients that may be incorporated into bread to provide health benefits. Because celiacs can not consume bread containing wheat flour, a need exists for gluten-free bread containing nutraceutical ingredients. In preliminary research, bread containing 12% brown sorghum bran and 5% flaxseed was developed. In an effort to reduce rapid staling, soy flour was substituted for 0, 2, 4, and 6% of the wheat flour. Bread was evaluated based on specific volume, crumb firmness, color, moisture, nutrition content, and sensory evaluation. Sorghum bran was high in dietary fiber (45%) and antioxidants (oxygen radical absorbance capacity, ORAC). Flaxseed also contained dietary fiber (28%) and omega-3 fatty acids. Soy flour was high in protein. High levels of soy flour increased crumb firmness and decreased specific volume. The bread containing 2% soy flour was preferred, however, by panelists in sensory evaluation. Per 56 g serving, this bread provided ~3 g dietary fiber, ~396 mg omega-3 fatty acids, and ~3417 mol TE antioxidant activity. The use of low levels of soy flour in bread containing sorghum bran and flaxseed may help improve palatability and increase consumption of dietary fiber, antioxidants, and omega-3 fatty acids in bread. A gluten-free bread containing sorghum bran, flax, and inulin was also developed for consumers with celiac disease. Breads were evaluated based on the same parameters as described above. Inulin was high in soluble fiber (90%). The optimum formula was 10% inulin, 5% sorghum bran, and 5% flax. This formula had improved specific volume, reduced crumb firmness, and an attractive dark colored crumb. One 56 g serving of the bread provided ~2 g dietary fiber, ~1882 mol TE antioxidant value, and ~287 mg omega-3 fatty acids. When compared to commercially available gluten-free bread mixes, the optimum formula was significantly improved with regards to crumb firmness and provided acceptable specific volume. Because of the improved bread qualities and high levels of health-promoting nutraceutical ingredients, the optimum formula could likely compete in the gluten-free bread market.

8 pp. / With the growing popularity of the gluten-free diet, there are many misconceptions surrounding gluten, carbohydrates, celiac disease, and gluten-sensitivity. This article explains the definitions of and differences between celiac disease, gluten-sensitivity, and other gluten-related conditions. The article also addresses the risks of adopting a gluten-free diet without a medical necessity to do so. Lastly, the article provides a healthy gluten-free recipe.

abstract: Background: Research has found that nearly a quarter of the American population follows a gluten-free diet in some capacity, while only about 1% of the population is diagnosed with celiac disease. Although the amount of research-based evidence supporting any health benefits of a gluten-free diet in an individual without a gluten- related disorder is limited, the number of people claiming to follow a gluten-free diet continues to rise. Also, despite an increasing belief that gluten is harmful for health, the potentially undesirable effects of gluten substitutions used in gluten-free foods are largely unknown. Due to the protein network encapsulating starch granules, gluten is thought to lengthen the amount of time needed during starch digestion, thereby reducing postprandial glycemia. Therefore, it is predicted that breads containing gluten will produce a lower glycemic response compared to gluten-free breads. Aim: The aim of this study was to investigate the glycemic response of gluten-free bread made with different types of flour compared to bread made with gluten-containing wheat flour. Methods: This study involved a 3-week, randomized, single blind crossover study in which 17 healthy individuals were asked to consume a different type of bread each week, 2 of which were gluten-free. Blood glucose was taken by finger prick at fasting as a baseline measurement, then for 2 hours after bread consumption in 30-minute increments. Results: Across the three groups, there was no significant difference in iAUC values after 120 minutes (p=0.192 ). The greatest mean was seen in the gluten-containing bread (145.3 ± 82.6), then the gluten-free bread made with rice flour (125.5 ± 62.8), and lastly the gluten-free bread made with potato and fava bean flour (112.4 ± 64.5). Conclusion: The inconsistent results of this study compared to previous, similar studies suggests that the postprandial glycemic response of gluten-free products can not be generalized as a whole, but instead is dependent on the type of product and the ingredients used to replace the gluten. Although the results did not show a significant difference, it does argue against the belief that gluten-free products are invariably better for health in the general, non-gluten sensitive population. / Dissertation/Thesis / Masters Thesis Nutrition 2019

Master of Science / Food Science Institute / Karen Schmidt / Flour is essential to bread production as it provides structure, texture, and flavor. The most common, wheat flour, is unique compared to other cereal flours as it forms gluten that is capable of forming viscoelastic dough, which retains gas produced during fermentation and helps create cohesive dough, all of which are critical to bread development. However, a certain percentage of the population has a rare autoimmune disorder, celiac disease, which is triggered by gluten. A gluten-free diet is the only remedy for celiac disease. Traditionally, in gluten-free breads, hydrocolloids, or gums have been used to mimic the behavior of gluten. However, the lack of a protein structure in breads made with hydrocolloids leads to an almost batter-like viscosity. Therefore, research has focused on gluten-free alternatives, particularly non-wheat cereal proteins that can be altered to mimic gluten’s dough forming properties. For example, zein has an average molecular weight and larger peptides than gluten, which contribute to its hydrophobic behavior. In fact, zein from maize flour is an ideal alternative as it can be manipulated to behave like gluten under certain conditions. The main difference between gluten and zein is that zein does not exhibit a large disulfide-linked polymer. Zein is also more hydrophobic than gluten. However, zein has been found to exhibit viscoelastic properties similar to gluten’s at temperatures higher than its glass transition. Other research has found the secondary structure of zein, in particular the β-sheet structure, increases at temperatures above its glass transition. This suggests that temperature and shear are not the only factors necessary to form and maintain the viscoelastic properties of zein; apparently, the β-sheet structures also affect viscoelasticity. Finally, differences such as maize variety and particle size also affect the properties of zein in bakery applications.

No description available.

Thesis (MA&D) -- AUT University, 2008. / Includes bibliographical references. Also held in print (405 leaves : ill. ; 30 cm.) in the Archive at the City Campus (T 616.399 WAL)

Thesis PlanA (M.S.)--University of Wisconsin--Stout, 2008. / Includes bibliographical references.

Master of Science / Food Science Institute / Fadi Aramouni / Flour from the fruit of breadfruit trees (Artocarpus altilis) holds the potential to serve as an alternative to gluten-containing flour and may aid in alleviating food insecurity. This study assessed the effects breadfruit flour contributes to gluten-free bread quality. Breadfruit flour was included at a baker’s percentage (0, 20, 35, 50%) of a gluten-free flour blend, and was treated with various leavening agents (yeast, 15% baking powder, 20% baking powder) to create varying gluten-free bread formulas. Density and pH of each batter was assessed along with loaf density, yield, specific volume, pH, water activity, crust color (L*, a*, b*), crumb color (L*, a*, b*), and texture. Additionally, a consumer sensory study was performed to ascertain degree of liking of appearance, color, flavor, texture, aftertaste, likelihood to purchase, and overall acceptability. Significant differences (p < 0.05) were found in batter pH, loaf density, yield, specific volume, color (crust b*, crumb L*, a*, b*), pH, water activity, and texture among flour inclusion and leavening treatments. Consumer testing yielded significant differences (p < 0.05) between the control and a yeast leavened 20% breadfruit formula in appearance, color, flavor, aftertaste, likelihood to purchase, and overall acceptability. While most consumers rated the breadfruit treatment lower than the control, five celiac panelists rated it higher. Among all treatments, loaves produced from 20% breadfruit flour inclusion had significantly lower density, yield, hardness, adhesiveness, gumminess, chewiness, and crumb yellowness (b*), as well as higher specific volume, springiness, crust yellowness (b*) and darkness (L*), crumb darkness (L*), and magenta hue (a*) compared to other breadfruit flour inclusion levels. Similarly, loaves leavened with yeast had significantly lower batter pH, loaf pH, density, yield, hardness, chewiness, crust yellowness (a*), crumb darkness (L*), magenta hue (a*), and yellowness (b*) as well as higher loaf water activity, volume, springiness, and crust darkness (L*) compared to other breadfruit flour inclusion levels. These results indicate breadfruit flour can be used at ≤ 20% in gluten-free bread formulas to replace rice flour and has potential as a fiber supplement. Further research is needed to assess how breadfruit flour affects the quality of other gluten-free product formulas.

Master of Science / Department of Grain Science and Industry / Rebecca A. Regan / Sorghum is unique in terms of its resistance to drought and heat and is grown and consumed around the globe. Moreover, sorghum does not contain gluten and has potential in the gluten-free market. A blend of non-wheat flour, starch and hydrocolloid typically provide the structure of gluten-free products. Most research on sorghum bread uses a yeast leavened process, HPMC gum, rice flour and corn, potato, or tapioca starch. Little is known about the functionality or interactions of different starches and hydrocolloids in sorghum batter. The objectives of this study were to examine starch-hydrocolloid interaction in chemically leavened gluten free sorghum bread; to evaluate the effects of different ingredients on gluten free bread quality made with sorghum flour: starch (tapioca starch, rice flour and potato starch): hydrocolloid (HPMC, locust bean gum and xanthan) and to develop a chemically leavened gluten free sorghum bread method. Bread was baked as pup loaves. Volume index was measured using the AACCI Method 10-91.01 template, crumb grain was evaluated using the C-Cell Imaging System and texture was determined with the TA.XT Plus Texture Analyzer. The base formula was commercial sorghum flour, water, starch, hydrocolloid, sugar, salt, shortening and double acting baking powder. Sorghum flour: starch (tapioca starch, rice flour and potato starch) ratios of 70:30, 80:20 and 90:10 were tested. Loaves containing all levels of rice flour had the same volume index (~165) as 100% sorghum flour (168) while all levels of tapioca starch and potato starch produced significantly smaller loaves (~150). The ratio of 90% sorghum flour and 10% starch (tapioca starch, rice flour and potato starch) was selected. The type and level of hydrocolloid significantly impacted loaf volume, grain and texture. Starch-hydrocolloid combinations which produced the best loaves were tapioca starch + 3% HPMC, rice flour + 3% xanthan and potato starch + 4% xanthan. Following initial optimization experiment, egg ingredients, fat, baking powder and water were added and evaluated individually to develop an optimized formulation. In general, addition of egg ingredients, shortening and oil did not improve the overall quality of sorghum based bread and were not added to the formula. However, emulsified shortening was effective. The best level of emulsified shortening was determined to be 3% for the breads with sorghum flour: tapioca starch or sorghum flour: potato starch and 5% for bread made with sorghum flour: rice flour. The best baking powder (SALP and MCP) levels were 5, 8 and 5% for sorghum flour: tapioca starch bread, sorghum flour: rice flour bread and sorghum flour: potato starch bread, respectively. Optimum levels of water for sorghum flour: tapioca starch bread, sorghum flour: rice flour bread, and sorghum flour: potato starch bread were 120, 110 and 120%, respectively. This research showed that different starch sources have different interactions with other ingredients in chemically leavened sorghum based gluten free bread.

The only treatment for celiac disease (CeD), an autoimmune disorder triggered by the ingestion of gluten, is lifelong adherence to a gluten-free diet (GFD). CeD and the GFD have been shown to be associated with low quality of life (QoL). In some individuals, such a strict diet can lead to disordered eating attitudes and behaviors. The purpose of this study was to better understand the extent to which disordered eating attitudes and behaviors may be common in a sample of adults diagnosed with CeD, as well as the relationship with various factors and QoL measures, including anxiety and depression. The study is a cross sectional pilot study of 50 individuals with CeD. Patients between the ages of 18 to 45 years old (mean=29.56, SD=7.40) with a biopsy-proven CeD diagnosis, following a GFD for at least a year (mean=7.20, SD=5.31) with no previous or current eating disorder diagnosis were recruited. In this study, suggestive ED (based on EDDS) and DE (based on EPSI) were present, but low (2% suggestive diagnosis of BED, 12% suggestive diagnosis of OSFED as per DSM-V). The distribution of the self-reported food attitudes and behaviors measures (CD-FAB scores) were spread out around the mean 36.96 (15.30) with a maximum score of 66 out of a possible 77. The CD-FAB may have utility in identifying adults with CeD that may be at risk for disordered eating attitudes and behaviors, particularly those in the first few years after diagnosis. It likely has limited utility in identifying suggestive EDs (as per EDDS) and DE (as per EPSI). The main factors that were associated with higher CD-FAB scores were BMI, number of symptoms, years since diagnosis, diet adherence and personality characteristics. Seven years after diagnosis seems to be an important cut-point in how participants rated food attitudes, fear responses and adaptive responses on the CDFAB scales. Higher CD-FAB scores had a significant and meaningful association with QoL scores. Participants recruited during the COVID-19 pandemic had significantly lower CD-FAB scores and higher QoL scores compared to those recruited pre-pandemic; despite not having significant differences in any other demographic characteristics.