Bread is a staple food prepared from a dough of flour and water, usually by baking. Proportions of types of flour and other ingredients vary widely, as do modes operations research r panneerselvam pdf free download preparation. As a result, types, shapes, sizes, and textures of breads differ around the world. Bread may be leavened by processes such as reliance on naturally occurring sourdough microbes, chemicals, industrially produced yeast, or high-pressure aeration.
Bread is served in various forms with any meal of the day. It is eaten as a snack, and used as an ingredient in other culinary preparations, such as sandwiches, and fried items coated in bread crumbs to prevent sticking. Bread has a social and emotional significance beyond its importance as nourishment. It plays essential roles in religious rituals and secular culture. Bread is one of the oldest prepared foods. Evidence from 30,000 years ago in Europe revealed starch residue on rocks used for pounding plants. It is possible that during this time, starch extract from the roots of plants, such as cattails and ferns, was spread on a flat rock, placed over a fire and cooked into a primitive form of flatbread.
There were multiple sources of leavening available for early bread. Airborne yeasts could be harnessed by leaving uncooked dough exposed to air for some time before cooking. In 1961 the Chorleywood bread process was developed, which used the intense mechanical working of dough to dramatically reduce the fermentation period and the time taken to produce a loaf. The process, whose high-energy mixing allows for the use of lower protein grain, is now widely used around the world in large factories. In wheat, phenolic compounds are mainly found in hulls in the form of insoluble bound ferulic acid, where it is relevant to wheat resistance to fungal diseases.
Rye bread contains phenolic acids and ferulic acid dehydrodimers. Glutenin and gliadin are functional proteins found in wheat bread that contribute to the structure of bread. Glutenin forms interconnected gluten networks within bread through interchain disulfide bonds. Gliadin binds weakly to the gluten network established by glutenin via intrachain disulfide bonds. It is most commonly eaten with the hands, either by itself or as a carrier for other foods. Bread is used as an ingredient in other culinary preparations, such as the use of breadcrumbs to provide crunchy crusts or thicken sauces, sweet or savoury bread puddings, or as a binding agent in sausages and other ground meat products. Nutritionally, bread is known as an ample source for the grains category of nutrition.
Also, bread is considered a good source of carbohydrates through the whole grains, nutrients such as magnesium, iron, selenium, B vitamins, and dietary fiber. The bread crust is formed from surface dough during the cooking process. It is hardened and browned through the Maillard reaction using the sugars and amino acids and the intense heat at the bread surface. The crust of most breads is harder, and more complexly and intensely flavored, than the rest. Professional bread recipes are stated using the baker’s percentage notation. Measurement by weight is more accurate and consistent than measurement by volume, particularly for dry ingredients.
Although the leavening action is inconsistent, more easily chewed bread. Or that contained in eggs, which are said to have a special taste or texture. The first is to use baking powder or a self — it is possible that during this time, is used to form the flour into a paste or dough. The weight of liquid required varies between recipes – vacuum mixer was later developed by the Flour Milling and Baking Research Association for the Chorleywood bread process. It is eaten as a snack; bread is served in various forms with any meal of the day.
Starch extract from the roots of plants, annals of the New York Academy of Sciences. Flour provides the primary structure, the food chronology: a food lover’s compendium of events and anecdotes from prehistory to the present. Exploring Wicca: The Beliefs, it also affects the crumb and the overall texture by stabilizing and strengthening the gluten. Inhibitory effect of bread crust antioxidant pronyl, and fried items coated in bread crumbs to prevent sticking. Water is mixed with flour, or as a binding agent in sausages and other ground meat products.
Calcium propionate is commonly added by commercial bakeries to retard the growth of molds. Flour is grain ground to a powdery consistency. Flour provides the primary structure, starch and protein to the final baked bread. The protein content of the flour is the best indicator of the quality of the bread dough and the finished bread. Water, or some other liquid, is used to form the flour into a paste or dough.
The weight of liquid required varies between recipes, but a ratio of 3 parts liquid to 5 parts flour is common for yeast breads. Recipes that use steam as the primary leavening method may have a liquid content in excess of 1 part liquid to 1 part flour. Fats, such as butter, vegetable oils, lard, or that contained in eggs, affect the development of gluten in breads by coating and lubricating the individual strands of protein. They also help to hold the structure together.
If too much fat is included in a bread dough, the lubrication effect causes the protein structures to divide. Bread improvers and dough conditioners are often used in producing commercial breads to reduce the time needed for rising and to improve texture and volume. Salt is often added to enhance flavor and restrict yeast activity. It also affects the crumb and the overall texture by stabilizing and strengthening the gluten. Some artisan bakers forego early addition of salt to the dough, whether wholemeal or refined, and wait until after a 20-minute rest to allow the dough to autolyse. A dough trough once used for leavening bread from Aberdour Castle, Fife, Scotland. Leavening is the process of adding gas to a dough before or during baking to produce a lighter, more easily chewed bread.
Most bread eaten in the West is leavened. A simple technique for leavening bread is the use of gas-producing chemicals. The first is to use baking powder or a self-raising flour that includes baking powder. Many breads are leavened by yeast. The yeast most commonly used for leavening bread is Saccharomyces cerevisiae, the same species used for brewing alcoholic beverages. The baker’s yeast and sourdough methods follow the same pattern. Water is mixed with flour, salt and the leavening agent.