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FLOUR
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| Tuesday, April 28, 2009 |
7. GRAINS USED FOR FLOUR.
--As has been pointed out elsewhere, numerous grains are raised by man, but only two of them, namely, wheat and rye, are used alone for the making of yeast, or leavened, bread. The other grains, such as corn, rice, and oats, produce a flat, unleavened cake, so they are seldom used for bread making unless they are mixed with white flour. Wheat and rye have been used for bread making for a very long time, and their universal use today is due to the fact that they
contain considerable protein in the form of gluten.
This is the substance that produces elasticity in the dough mixture, a condition that is absolutely essential in the making of raised bread. In fact, the toughness and elasticity of bread dough are what make it possible for the dough to catch and hold air
and gas and thus produce a light, porous loaf.
8. Of these two grains, rye is used less extensively in the United States for the making of bread than wheat, although in some countries, particularly the inland countries of Continental Europe, considerable use is made of it. Its limited use here is undoubtedly due to the fact that when rye is used alone it makes a moist, sticky bread, which is considered undesirable by most persons.
The reason for this is that, although rye contains a sufficient quantity of gluten, this substance is not of the proper quality to make the elastic dough that produces a light, spongy loaf. Therefore, when rye is used, wheat flour is generally mixed with it. The result is a bread having a good texture, but the dark color and the typical flavor that rye produces.
9. Wheat, the other grain used for bread making, is an annual grass of unknown origin. It is used more extensively for food than any other grain. In fact, it has been estimated that the average quantity consumed by each person is about 6 bushels a year, and of this amount by far the greater part is used in the making of bread.
Since so much of this grain is used as food, considerable time and effort have been spent in developing those qualities which are most desirable for the purpose to which wheat is put and in perfecting the processes whereby wheat flour of a good quality may be obtained.
This grain is particularly well adapted for bread making because of the nature of the proteins it contains and the relative proportions of these. These proteins, which occur in the wheat grain in the form of gluten, are known as gliadin and glutenin.
The gliadin imparts elasticity and tenacity, or toughness, to the gluten, and the glutenin gives it strength. It is not, however, so much the quantity of gluten in the wheat grain that actually determines the quality of flour as the fact that the two varieties must be present in the proper proportions in order for the gluten to have the properties desired for bread making.
Wheat consists of numerous varieties, but only two of these are grown and used in the United States, namely, spring, or hard, wheat and winter, or soft, wheat. |
posted by neptunus @ 6:38 PM
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