Download or read book Effects of Sorghum Polyphenols on In Vitro Starch Digestibility and Protein Profile of Wheat Flour Tortillas written by Kristen Lea Dunn and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As incidences of diseases associated with dietary patterns increase in the United States, focus has been placed on improving nutritional quality of processed foods. Carbohydrates contribute the most calories in the American diet (55%), making starch-based foods a target for improvement. Tortillas are increasingly popular among American consumers, serving as a good target to address this problem. This study investigated the use of sorghum bran to increase polyphenols and dietary fiber in wheat flour tortillas and the effect on starch digestibility and protein profiles. Refined wheat flour tortillas were substituted at 10%, 15%, and 25% (Baker's) with brans from wheat and white, brown, and black sorghum. Dough rheology, phenolic profile, starch digestibility, and protein profiles were evaluated after dough formation, hot pressing, baking, and over 14 days of storage. Bran substitution affected dough rheology, producing rougher, stiffer, less extensible dough compared to the refined control. Processing, storage, and bran source significantly affected the phenolic profile of the tortillas. Total phenols, 3- deoxyanthocyanins, and proanthocyanidins (PA) decreased with processing and storage. Dough formation drastically decreased phenol content in brown sorghum bran dough compared to other treatments. Extractable high molecular weight PA also decreased dramatically after processing by 58 - 76% in brown sorghum bran tortillas. These tortillas had less rapidly digestible starch and more slowly digestible starch than other treatments at 25% substitution. Compared to the expected total dietary fiber (TDF), sorghum brans doubled the formation of TDF (20 - 26%) as compared to wheat bran (11%). The largest increase was observed in brown sorghum bran tortillas. In tortillas substituted at 25%, insoluble protein (IP) increased with baking and storage as extractable protein (EP) decreased. Within the EP fraction, soluble polymeric protein (SPP) decreased by 40 - 61% after baking. Brown sorghum bran dough contained significantly higher IP and lower SPP than other treatments; however, this effect was reduced after baking. Sorghum brans provided polyphenols that interacted with protein and starch in wheat flour tortillas. PA and SPP largely contributed to these interactions, forming insoluble complexes that decreased tortilla digestibility and may positively benefit weight management. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152809

Download or read book Sorghum Tannins written by Frederico Ribeiro de Barros and published by . This book was released on 2013 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most of the calories in cereal foods come from starch. Decreasing starch digestibility is fundamental to prevent obesity and diabetes. This study investigated interactions of condensed tannins (proanthocyanidins-PA) and other sorghum phenolic compounds with starch molecules and their effect on in vitro starch digestibility. High tannin (predominant in large molecular weight PA, 80%), black (monomeric polyphenols) and white (low in polyphenols) sorghum phenolic extracts were cooked with starches varying in amylose content. Starch pasting properties, polyphenol profile and in vitro starch digestibility were evaluated. Unlike other treatments, samples with tannin phenolic extracts had significantly (P 9́Þ 0.05) lower setback in the test using a Rapid Visco Analyser (RVA) compared to control. The same treatments had the least extractable phenol and PA contents after cooking with all starches. These evidences suggest interactions between starch molecules and PA. Furthermore, after mixing tannin phenolic extracts with pure amylose/amylopectin, extractable polymeric PA was in much lower concentration (62% less) in presence of amylose compared to amylopectin. This drop in concentration increased to 85% when purified tannin extract (90% polymeric PA) was used. This indicates a stronger interaction between amylose and large molecular weight PA. When high amylose starch was used in an autoclave cooking/cooling technique, the RS content of control (26.4%) was similar (P > 0.05) to samples with black phenolic extracts (27%); samples with tannin phenolic extracts increased RS to about 40%. The RS increased to 46% when purified tannin extract was used. All these evidences suggest that sorghum condensed tannins, specifically the polymeric PA, directly interacted with amylose, increasing RS content, whereas the monomeric polyphenols did not. This study opens opportunities to use tannin sorghum to develop products for diabetics and weight control, high in dietary fiber and natural dark color. In the other part of this project, polyphenols from black and tannin sorghum bran were extracted using an Accelerated Solvent Extractor (ASE) and eco-friendly solvents such as water, and mixtures ethanol/water. ASE at 120 and 150 degrees C using 50 and 70% ethanol/water was efficient in extracting as much phenols (45 mg GAE/g) and 12% more antioxidants (628 [mu]mol TE/g) from black sorghum compared to conventional methods using aqueous acetone and acidified methanol. Therefore, ASE extracts from black sorghum could be used in beverages and in colorants containing high antioxidant content. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148280

Download or read book The Effects of Sorghum Sorghum Bicolor L Moench Phenolic Compounds on Starch Digestibility of Porridges written by Dilek Austin and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two tannin sorghums, (high-tannin, black with tannin), high anthocyanin sorghum (black), and non-tannin sorghum (white) were used to investigate the effects of sorghum phenolic compounds on in vitro starch digestibility, estimated glycemic indices (EGI) and resistant starch contents (RS) of porridges. Sorghum varieties were chosen to have a wide range of total phenols (3-23 mg/g gallic acid) and tannin contents (0-34 mg catechin eq./g). Normal corn starch, enzyme resistant high amylose corn starch, and whole sorghum grains were cooked with the aqueous fraction of sorghum bran extracts obtained with 70% aqueous acetone. Endosperms of soft and hard sorghum varieties were mixed with sorghum brans and cooked into porridges with distilled water. Hi-tannin, black and black with tannin sorghum bran extracts significantly (p

Download or read book In Vitro Digestibility of Starch in Sorghum Differing in Endosperm Hardness and Flour Particle Size written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In vitro digestibility of starch in sorghum grains differing in endosperm hardness and flour particle size was assayed by an Englyst resistant starch (RS) method. The starch digestibility increased as the particle size of flour decreased, but no significant difference in starch digestibility was observed among sorghum flours milled from grains with different hardness. To further understand the digestion of starch in sorghum, the effects of protein on starch digestion and amylose content in starch were determined. pH value was a factor affecting protein digestion since protein digestibility was higher at pH 2.0 than that at pH 1.3. Protein hydrolysis increased with time of pepsin treatment, leading to an increased starch digestion. RS content was 10.61-29.54% in native sorghum flours and 8.47-26.28% in isolated sorghum starch. The amounts of [Gamma]-kafirins extracted increased with time of pepsin treatment while [Alpha]- and [Beta]-kafirins decreased. The starch in sorghum flour with median hardness had a higher amylose content (23.9%) than the starch in hard and soft flours (~21%), which gave lower starch digestibility. Protein digestibility decreased after cooking while starch digestibility increased. Sulfhydryl groups decreased after cooking, indicating that disulfide bonds formed between protein molecules and may have formed a barrier for enzymes to access and digest starch. Confocal laser scanning microscopy (CLSM) showed that the protein matrix was less evident after pepsin treatment. As a result, starch digestion increased after protein matrix was removed.

Download or read book In Vitro Starch Digestibility and Estimated Glycemic Index of Sorghum Products written by Angelina De Castro Palomino Siller and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fractions from white and tannin sorghums were processed into extrudates, thick porridges, and breads. The effects of sorghum type and fraction on the in vitro starch availability of the products were evaluated, and the estimated glycemic indexes (EGI) of the products were obtained. Sorghum extrudates were significantly more slowly digested than corn meal extrudates for all preparation methods (whole, cracked and decorticated kernels). Furthermore, tannin extrudates were less digestible than white sorghum extrudates. The soft endosperm nature of the tannin sorghum limited friction formation inside the extruder, reducing starch gelatinization. On the other hand, condensed tannins also interfered with the starch availability for digestion. White sorghum was more 'suitable' for extrusion, giving extrudates with higher starch degradation and expansion than the tannin sorghums. However, tannin sorghums also gave acceptable products offering the benefit of lower EGI values. Sorghum porridges were more slowly digested than a corn flour porridge when using whole and decorticated flours. In addition, tannin sorghum porridges had a lower starch digestibility compared to all the samples. Tannin sorghum flours produced soft porridges with enhanced initial starch digestibility. However, condensed tannins seemed to offset the starch digestion by limiting starch availability. All sorghum porridges had significantly lower EGI values than the corn porridge. Extrudates and porridges had reduced starch digestibilities and EGI values when using whole grains compared to using the decorticated fractions. This was observed in both the white and the tannin sorghum. Therefore, whole-grain products from sorghum have health benefits attributed to whole grain foods and slower digesting starches; for instance, prevention and treatment of diseases such as diabetes, insulin resistance, obesity, cardiovascular disease, and some types of cancer. When 12% of tannin bran was added to a wheat bread formulation, a slower rate of starch digestion was observed compared to a wheat bread. The high concentration of non-starch components of the bran (i.e. dietary fiber, condensed tannins) affected starch digestion. The addition of tannin sorghum bran significantly reduced the EGI value of wheat bread, besides being a natural source of brown color, and an excellent source of antioxidants and dietary fiber.

Download or read book Roles of Carbohydrates and Proteins in the Staling of Wheat Flour Tortilla written by Juma Novie Ayap Alviola and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of enzymatic modification of starch, proteins and pentosans on dough and tortilla properties were determined to establish the role of these wheat components in tortilla staling. Starch, protein and pentosans were respectively modified with a-amylase, protease and transglutaminase (TG), and xylanase. Tortillas were stored at 22oC and evaluated for at least three weeks. Amylase improved shelf-stability of tortillas, produced a significant amount of dextrins and sugars, retarded decrease in amylose solubility, and weakened starch granules. However, control and treated tortillas had similar degrees of amylopectin crystallinity. Staling of tortillas appears to involve starch that reassociates into an amorphous structure. Micrographs of control dough had thin protein strands forming a continuous matrix. Protease-treated dough had pieces of proteins in place of the continuous matrix, while TG-treated dough had thicker protein strands that were heterogeneously distributed. Both treatments resulted in shorter shelf-stability of tortillas. The organization of protein in dough is important for dough structure and appears to impact tortilla flexibility. Protein solubility and SDS-PAGE results did not differentiate control and treated dough or tortillas. The fractions or molecular weight distribution are not significant determinants of protein functionality. Tertiary and quaternary protein structures of gluten may be more related to tortilla shelf-stability. The 75 ppm xylanase treatment resulted in weaker tortilla structure and significantly higher amounts of low molecular weight saccharides and sugars. Control and the 25 ppm treatment sample had a similar shelf-stability and texture profile. Pentosans may affect staling indirectly through the effect on gluten development. Fresh tortillas have amylopectin in an amorphous state, while amylose is mostly retrograded. The gluten matrix provides additional structure and flexibility to the tortilla. Pentosans may or may not be attached to the gluten network. Upon storage, amylopectin retrogrades and recrystallizes, firming the starch granules, resulting in firmer tortillas. Starch hydrolysis decreased the rigid structure and plasticized polymers during storage. It also reduced the restriction imposed by retrograded starch on gluten and allowed it more flexibility. Thus, the flexibility of tortillas results from the combined functionalities of amylose gel, amylopectin solidifying the starch granules during storage, and the changed functionality of gluten after baking.

Download or read book Effects of Sorghum Starch and Protein on Sorghum wheat Composite Bread Volume and Texture written by Jie Hu and published by . This book was released on 2001 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Harnessing the Benefits of Sorghum written by Nyambe Lisulo Mkandawire and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In vitro starch digestibility of raw and processed wholegrain sorghum flours did not correlate with condensed tannin content in each of the 15 flours tested. However, tannin extracts both reduced and enhanced amylase activity depending on conditions. This trend was clear in extracts but more complex in wholegrain flours.

Download or read book Effects of Variations in High Molecular Weight Glutenin Allele Composition and Resistant Starch on Wheat Flour Tortilla Quality written by Tom Odhiambo Jondiko and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tortilla sales are projected to exceed 9.5 billion by 2014. However, currently no wheat cultivars have been identified that possess the intrinsic quality attributes needed for the production of optimum quality tortillas. Tortillas made with refined wheat flour low in dietary fiber (DF) are popular in the United States due to their sensory properties. This study explored the use of wheat lines (WL) possessing variations in high molecular weight glutenin allele sub-units (HMW-GS) for production of tortillas and also investigated the use of corn based resistant starches (RS), type II (RS2) and wheat based RS type IV (RS4) to increase DF in tortillas. Tortillas were made with 0-15 percent RS and 100 percent whole white wheat (WW). Flour protein profiles, dough, and tortilla properties were evaluated to determine the effects of the allelic variations and RS substitution on tortilla quality. Sensory properties of tortillas with RS were determined. Variations in HMW-GS composition significantly affected the protein quality and tortilla properties. Flour from WL possessing allelic combinations (2*, 17+18, 7, 2+12), (1, 17+18, 5+10), (2*, 17, 2+12) and (1, 2*, 17+18, 2+12) had 12.8-13.3 percent protein. These WL had extensible doughs and produced large diameter tortillas with superior (greater than or equal to 3.0) flexibility after 16 days compared to control. However, WL with (17+18 and 5+10) and (2*, 17+7, 5) produced extensible doughs, large, but less flexible, tortillas compared to control. WL with (2*,17+18,5+10) and (1,2*,7+9,5+10) produced smaller diameter tortillas, but with superior flexibility compared to control. RS2, WW, and cross-linked-pre-gelatinized RS4 (FiberRite) produced hard, less-extensible doughs and thinner tortillas compared to control, due to high water absorption. Cross-linked RS4 (Fibersym) dough and tortillas were comparable to control. 15 percent of RS2 and RS4 increase DF in control to 6 and 14 percent respectively, compare to control (2.8 percent DF). WW tortillas were less acceptable than control in appearance, flavor and texture, while tortillas with 15 percent Fibersym had higher overall acceptability than control. RS2 negatively affected dough machinability and tortilla shelf stability. However, 15 percent RS4 improved the DF in refined flour tortillas to meet FDA's "good source of fiber claim," without negatively affecting dough/tortilla quality.

Download or read book Effects of Composite Flours on Quality and Nutritional Profile of Flour Tortillas written by Maria Gritsenko and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Obesity, glucose intolerance or insulin resistance and elevated blood pressure are now prevalent in the U.S. Increased intake of dietary fiber, omega- 3 fatty acids, and antioxidants may help prevent or manage these diseases. Tortillas are now part of the American diet, and are excellent carriers of higher amounts of fiber and other nutraceutical ingredients. This study was conducted to determine the effects of incorporating nutraceutical ingredients (flaxseed, sorghum bran, oat flour, buckwheat flour) on whole white wheat tortilla quality. Tortillas were prepared using a hot-press, gas-fired oven and were evaluated for physical properties, texture and shelf-stability. Objective and subjective tests demonstrated that whole white wheat and multigrain tortilla doughs were harder, rougher and less extensible than refined flour tortilla dough. Multigrain flour tortillas were thinner, larger and more translucent than the refined flour treatment. Incorporation of whole multigrain flours affected color of the product, giving darker tortillas. Tortilla flexibility decreased over time. After 16 days of storage rollability scores of tortillas decreased drastically. The most pronounced decrease in tortilla flexibility was observed for 5% sorghum bran, 10% buckwheat, and for the treatment prepared with of 5% flax, 5% sorghum, 5% oat, 5% buckwheat. The flexibility loss was higher for whole white wheat and multigrain tortillas than for the refined one which was confirmed with objective and subjective tests. To extend shelf stability of whole multigrain tortillas various amounts of commercial hydrocolloid and [alpha]-amylase were added to the formulation. Tortillas with 75 ppm, 100 ppm of [alpha]-amylase, 1% and 1.5% of gum retained their flexibility during 16 days of storage. Consumer acceptability of the whole multigrain tortillas (5% flaxseed, 5% sorghum bran, 5% oat, 5% buckwheat) was compared with commercial multigrain tortillas and whole white wheat flour tortillas using an untrained sensory panel. The multigrain tortillas were liked by the panel as much as the other samples. Prepared multigrain tortillas had improved nutritional value. Each multigrain treatment contained at least 3 g of dietary fiber, 0.29 g of [alpha]- linolenic fatty acid, lignans and antioxidants. It makes possible to claim them as a "good source of dietary fiber" and "an excellent source of [alpha]-linolenic fatty acid". The formulations tested, together with future refinements, provide more options to consumers seeking healthier alternatives to refined wheat flour tortillas.

Download or read book Bakery Products written by Y. H. Hui and published by John Wiley & Sons. This book was released on 2008-02-28 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: While thousands of books on baking are in print aimed at food service operators, culinary art instruction, and consumers, relatively few professional publications exist that cover the science and technology of baking. In Bakery Products: Science and Technology, nearly 50 professionals from industry, government, and academia contribute their perspectives on the state of baking today. The latest scientific developments, technological processes, and engineering principles are described as they relate to the essentials of baking. Coverage is extensive and includes: raw materials and ingredients, from wheat flours to sweeteners, yeast, and functional additives; the principles of baking, such as mixing processes, doughmaking, fermentation, and sensory evaluation; manufacturing considerations for bread and other bakery products, including quality control and enzymes; special bakery products, ranging from manufacture of cakes, cookies, muffins, bagels, and pretzels to dietetic bakery products, gluten-free cereal-based products; and specialty bakery items from around the world, including Italian bakery foods. Blending the technical aspects of baking with the freshest scientific research, Bakery Products: Science and Technology has all the finest ingredients to serve the most demanding appetites of food science professionals, researchers, and students.

Download or read book The Chemical Composition and Nutritional Value of Low and High Polyphenolic Sorghums Sorghum Bicolor L Moench for Tribolium Castaneum Larvae and Chickens written by Drinah Buthu Grace Banda-Nyirenda and published by . This book was released on 1984 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sorghum and Millets in Human Nutrition written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 1995 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The publication is broad in scope and coverage, starting with the history and nature of sorghum and millets and dealing with production, utilization and consumption. It provides extensive information on the nutritional value, chemical composition, storage and processing of these foods. In addition, the anti-nutritional factors present in these foods and ways of reducing their health hazards are discussed. The authors have described formulations of various popular foods prepared from sorghum and millets and their nutritional composition and quality, and they have compiled many recipes for the preparation of foods from regions where sorghum and millets are important dietary staples.

Download or read book Cereal Grains for the Food and Beverage Industries written by Elke K Arendt and published by Elsevier. This book was released on 2013-04-09 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cereals are a staple of the human diet and have a significant effect on health. As a result, they are of major significance to the food industry. Cereal grains for the food and beverage industries provides a comprehensive overview of all of the important cereal and pseudo-cereal species, from their composition to their use in food products.The book reviews the major cereal species, starting with wheat and triticale before covering rye, barley and oats. It goes on to discuss other major species such as rice, maize, sorghum and millet, as well as pseudo-cereals such as buckwheat, quinoa and amaranth. Each chapter reviews grain structure, chemical composition (including carbohydrate and protein content), processing and applications in food and beverage products.Cereal grains for the food and beverage industries is an essential reference for academic researchers interested in the area of cereal grains and products. It is also an invaluable reference for professionals in the food and beverage industry working with cereal products, including ingredient manufacturers, food technologists, nutritionists, as well as policy-makers and health care professionals. - A comprehensive overview of all of the important cereal and pseudo-cereal species - Chapters review each of the following species: Wheat, Maize, Rice, Barley, Triticale, Rye, Oats, Sorghum, Millet, Teff, Buckwheat, Quinoa and Amaranth - Reviews grain structure, chemical composition, processing and applications in food and beverage products for each of the considered grains

Download or read book Effect of Heat and Reducing Agents on in Vitro Digestibility of Sorghum Proteins written by Bruce Rankin Hamaker and published by . This book was released on 1986 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sorghum Nutritional Quality written by and published by . This book was released on 1990 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Physicochemical Properties of Sorghum Starch and Endosperm on the Quality of a Traditional African Food written by John Olusola Akingbala and published by . This book was released on 1982 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physicochemical properties of starch and endosperm were characterized for several sorghumcultivars. A small scale laboratory method was developed for cooking to in acid and alkali media using 9.5 g sorghum flour. Testing procedures were established to characterize to properties. Then the effects of the physicochemical properties on the texture storage and color of to were evaluated. Alkali to (pH 8.8) was stickier and softer than acid to (pH 4.6) in all samples. Acid to was lighter in color than alkali to. Storage for 24 hr. at up to 35(DEGREES)C decreased the stickiness and softness of to from most sorghum varieties. The genetic property of the grain, the environment during growth and maturation and the pH of the cooking medium all interracted to determine textural and keeping properties of to. Thousand kernel weight, was not related to to textural properties. However kernel density and endosperm texture were significantly related to the texture of acid to. Flour particle size increased as the corneous portion of the kernel increased. Acid to from grains with corneous endosperms were firmer and less sticky than to from floury endosperms. However, endosperm texture and flour particle size were not related to texture of alkali to. Protein, starch and amylose content of the endosperm did not significantly relate to to texture. The enzyme susceptible starch in the flour was related to to texture (r = 0.68). Waxy sorghums make very soft and sticky to. Starch pasting and setback viscosities were significantly correlated with texture of acid to. The relationship between the amylograph cooking properties of flour and to texture was significantly due to differences in pH of the cooking media and parameters measured. Starch swelling power and solubility are not significantly related with to quality. However starch granule size affected the texture of stored alkali to significantly (r = 0.60).