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consumer acceptability of spiced composite bread - The Federal ...

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to Sudan Savannah and Sahel Zones (Okoh, 1998). <strong>The</strong>re are different types <strong>of</strong> wheat, these<br />

include the hard red spring, hard red spring, hard red winter, durum, s<strong>of</strong>t red and<br />

spring/winter wheat. Others include Manitoba and English s<strong>of</strong>t wheat (Nnenne, 1998)<br />

Wheat grains are ovoid in shape. <strong>The</strong> wheat is a seed, which is fitted for reproducing the<br />

plant from which it came. <strong>The</strong> germ is an embryo plant, with a radicle, which can grow into a<br />

root system and a plumule, which can develop into stems, leaves and ears.<br />

2.1.2 COMPOSITION OF WHEAT GRAIN<br />

Like any seed, the wheat kernel is a complex structure with many individual components.<br />

However with respect to processing (i.e., milling) the wheat kernel is divided into three<br />

general anatomical regions. <strong>The</strong> outer protective layers <strong>of</strong> the kernel are collectively called<br />

the bran. <strong>The</strong> bran comprises about 14% <strong>of</strong> the kernel, by weight, and is high in fiber and ash<br />

(mineral) content. <strong>The</strong> germ, the embryonic wheat plant, comprises only about 3% <strong>of</strong> the<br />

kernel. Most <strong>of</strong> the lipids and many <strong>of</strong> the essential nutrients in the kernel are concentrated in<br />

the germ. <strong>The</strong> remaining inner portion <strong>of</strong> the kernel is the starchy or storage endosperm,<br />

which provides the energy and protein for the developing wheat plant. It is characterized by<br />

its high starch and moderately high protein (i.e., gluten) content.<br />

<strong>The</strong> endosperm constitutes the major portion <strong>of</strong> all kernels and is the primary constituent <strong>of</strong><br />

flour. Finally a single, highly specialized layer <strong>of</strong> endosperm cells forms a border between the<br />

starchy endosperm and the bran. This layer, called the aleurone, is usually considered part<br />

<strong>of</strong> the endosperm, but it is biologically much more active and, subsequently, contains high<br />

enzyme activity. Because <strong>of</strong> its composition, activity, and location, it can exert a variety <strong>of</strong><br />

negative effects on the <strong>acceptability</strong> <strong>of</strong> flour. Consequently, it is generally removed as part <strong>of</strong><br />

the bran during most flour milling operations; in fact, millers consider the aleurone to be<br />

part <strong>of</strong> the bran.<br />

5

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