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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The Effects of Oat Fiber and Corn Bran on Blood Serum Cholesterol and Triglyceride Levels

Broeder, Craig E. (Craig Elliot) 08 1900 (has links)
Forty Sprague Dawley rats were randomly placed in five groups with eight rats per group. Each group varied in dietary composition for fiber type and carbohydrate source. Groups one and two received oat fiber and either sucrose or corn starch as the carbohydrate source. Groups three and four received corn bran as the fiber source and either sucrose or corn starch as the carbohydrate source. Group five (considered the control group), received Purina standard rat chow. Analysis of variance showed only significant differences for food intake, and the control group had a significantly higher food intake. Weight gain, serum cholesterol and triglyceride levels showed no significant differences.
2

Efeito de diferentes fontes de fibras brancas na qualidade de pão de forma / Effects of different sources of white fibers in bread

Ishida, Patricia Mello Garrido, 1976- 09 April 2012 (has links)
Orientador: Caroline Joy Steel / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos / Made available in DSpace on 2018-08-21T01:27:39Z (GMT). No. of bitstreams: 1 Ishida_PatriciaMelloGarrido_M.pdf: 10468557 bytes, checksum: e14750e5c86d022d5e7540a7e8e04a2f (MD5) Previous issue date: 2012 / Resumo: O uso de fibras brancas se mostra como uma alternativa de enriquecimento de fibras ao pão diminuindo os efeitos sensoriais negativos das fibras comuns, como coloração mais escura em relação aos pães sem fibras. Dentre as fibras brancas disponíveis temos as fibra de trigo-TR e aveia-AV (insolúveis) e a goma acácia-GA (solúvel). O objetivo deste trabalho foi verificar os efeitos de fibras brancas aplicadas em pães de forma, avaliando possíveis alterações na qualidade tecnológica e a aceitação sensorial dos pães. Este trabalho foi dividido em duas etapas: 1 - Estudo das características físico-químicas e sensoriais de pães de forma comerciais (brancos e integrais) do mercado brasileiro e; 2 - Estudo do efeito de fibras brancas na qualidade de pão de forma. Na Etapa 1, foram adquiridas 12 amostras de pães brancos e integrais consumidos no Brasil. Foram obtidos volumes específicos entre 3,88 e 5,37 mL/g para pães brancos e integrais. Os miolos no primeiro dia apresentaram: umidade 37,03 e 41,23%, aw 0,954 e 0,966, firmeza 267,8 e 276,3 gf; e média de cor: L* 74,73 e 64,45, a* 0,37 e 3,85 e b* 15,51 e 18,98 para pães brancos e integrais respectivamente. No período analisado, todos mostraram aumento da firmeza, diminuição de umidade e aw e a cor praticamente não foi alterada. Na análise sensorial (6 pães n=121), 67,8% eram mulheres e 72,7% consumiam pão de forma de 2 a 7 vezes semanalmente. Os três fatores mais importantes no ato da compra foram sabor (19,6%), maciez (16,8%) e validade (14,3%). 67,8% disseram preferir pão com fibras, 82,6% disseram que provavelmente ou certamente comprariam um pão branco com fibras. No teste de aceitação, apenas em relação à textura os pães brancos foram mais aceitos do que os integrais. O Mapa de Preferência Interno mostrou que um pão branco foi o mais aceito. Na Etapa 2, foram produzidos pães, utilizando um planejamento completo central 23, tendo como variáveis independentes TR (0 a 10%), AV (0 a 10%) e GA (0 a 5%). Foram obtidos volumes específicos de 3,30-4,97 mL/g para os ensaios e 5,00 mL/g para o controle (FC). Os miolos no primeiro dia apresentaram: umidade 36,98-42,58%, aw 0,948-0,965, firmeza 193,9-404,4 gf e para FC: 37,53%, 0,954, 227,5 gf. A cor dos miolos no primeiro dia foi de: L* 73,46-78,08, a* 0,36-1,10 e b* 15,95-18,93 e FC: L* 79,08, a* 0,35, b* 14,90. O valor de ?E variou de 1,69 a 6,62 neste dia. As fibras de trigo e aveia aumentaram: absorbância (Abs) e tempos de chegada (TC), desenvolvimento (TD) e saída (TS), umidade, aw e firmeza e; diminuíram a extensibilidade (E). A goma acácia aumentou E, diminuiu Abs, TC, TD, TS. As três fibras diminuíram o volume específico e L* e aumentaram a* e b*. As três formulações da validação dos modelos foram: FF (2,5% GA); FR1 (6% AV e 2,5% GA) e FR2 (2% TR, 4% AV e 2,5% GA). Abs, umidade, aw, L* e b* apresentaram alta correlação entre valores preditos e experimentais. No teste de aceitação (n=121) não foram encontradas diferenças significativas para aparência, aroma, sabor, textura e impressão global. FR2 apresentou a maior redução nos índices de hidrólise (-24,9%) e glicêmico (-14,4%), 6,7% de fibras totais e boa aceitação pelos consumidores / Abstract: The use of white fibers is shown as an alternative enrichment fiber bread minimize their negative sensory fibers common as darker compared to bread without fiber. Among the white fibers available have the fiber wheat-TR and oats-AV (insoluble) and gum acacia-GA (soluble). The objective of this study was to assess the effects of white fibers applied to pan bread, assessing possible changes in the technological quality and sensory acceptance of the loaves. This work was divided into two steps: 1 - Study the physical-chemical characteristics and sensory analysis of commercial pan bread (white and whole grain) and; 2 - Study the effect of white fibers on the quality of bread. In Step 1, 12 samples were acquired white and whole breads consumed in Brazil. Specific volumes were obtained between 3.88 and 5.37 mL/g for white and whole grain breads. The brains were on the first day: moisture 37.03 and 41.23%, aw 0.954 and 0.966, firmness 267.8 and 276.3 gf and color average: L* 74.73 and 64.45, a* 0.37 and 3.85 and b* 15.51 and 18.98 for white bread and whole bread respectively. In the period analyzed, all showed increased strength, reduced moisture and aw and the color was practically not changed. In the sensory analysis (6 breads, n = 121), 67.8% were women and 72.7% ate bread 2-7 times a week. The three most important factors in the purchase were flavor (19.6%), tenderness (16.8%) and validity (14.3%). 67.8% said they preferred bread with fiber, 82.6% said they probably or definitely buy a white bread with fiber. In acceptance testing, only in relation to the texture white breads were more acceptable than the whole. The internal preference mapping showed that a white bread was more accepted. In Step 2, buns were produced using a central composite 23, having as independent variables TR (0-10%), AV (0-10%) and GA (0-5%). We obtained specific volumes from 3.30 to 4.97 mL/g for the trials and 5.00 mL/g for the control (FC). The brains were on the first day: moisture 36.98-42.58%, aw 0.948-0.965, firmness 193.9-404.4 gf and FC: 37.53%, 0.954, 227.5 gf. The color of the brains on te first day was: L* 73.46-78.08, a* 0.36-1.10 and b* 15.95-18.93 and FC: L* 79.08, a* 0.35, b* 14.90.The value of ?E ranged from 1.69 to 6.62 on this day. The wheat and oat fibers have increased: Absorbance (Abs), arival (TC), development (TD), output (TS) times, moisture, firmness and aw, and decreased extensibility (E). Acacia gum increased E and decreased Abs, TC, TD, TS. The three fibers decreased the specific volume and L* and increased a* and b*. The three formulations of the validation of the models were: FF (GA 2.5%), FR1 (AV 6% and GA 2.5%) and FR2 (TR 2%, AV 4% and GA 2.5%). Abs, moisture, aw, L* and b* values showed a high correlation between predicted and experimental values. In the acceptance test (n = 121) were not significant differences for appearance, aroma, flavor, texture and overall impression. FR2 showed the greatest reduction in hydrolysis index (-24.9%) and glycemic index (-14.4%), 6.7% of total fiber and good consumer acceptance / Mestrado / Tecnologia de Alimentos / Mestra em Tecnologia de Alimentos
3

Exploring the Synergistic Effect of Corn and Oat Fiber on Egg Albumin-Induced Reduction in Oil Absorption During Frying

Myers, Andrew S. January 2011 (has links)
No description available.

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