Flour is produced by milling wheat kernels.
A wheat kernel has an outer covering called bran. It is composed of several layers that protects the endosperm( contains starch and proteins).
Innermost part is the germ(contains fat) and serve as wheat seed. During milling, kernels first pass through metal rollers to crack them.
Then bran and germ are removed through repeated stages of sifting and separation. The remaining endosperm is then ground to the flour.
Flour derived from portion of endosperm closer to the germ is finer(known as all purpose flour)
whereas flour derived form the portion of the endosperm nearer the bran is coarser and darker( known as wholemeal flour)
Victoria flour information centre, www.victoriapacking.com/flourinfo.html
www.nutritioncrashcourse.com/Refined-grains-kernel-diagr.jpg
Let us now take compare both flours:
p/s: click on the image for clearer view.
reference of the nutritional values:
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