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White flour is made entirely from the endosperm or protein/starchy part of the grain, leaving behind the germ and the bran or fiber part. In addition to marketing the bran and germ as products in their own right, middlings include shorts (making up approximately 12% of the original grain, consisting of fractions of endosperm, bran, and germ with an average particle size of 500–900 microns ...
Wheat germ or wheatgerm is a concentrated source of several essential nutrients, including vitamin E, folate (folic acid), phosphorus, thiamin, zinc, and magnesium, as well as essential fatty acids and fatty alcohols. [10] [11] It is a good source of fiber. [12] White bread is made using flour that has had the germ and bran removed. [13]
The bran is rich in dietary fiber and fatty acids, and contains significant quantities of starch, protein, vitamins, and minerals. The germ is a source of several nutrients, [5] including vitamin E, folate, phosphorus, thiamin, zinc, and magnesium, as well as fatty acids and fatty alcohols. The germ is also a source of fiber.
The germ is the embryo of the seed that contains B vitamins and trace minerals. Because the germ has a fat content of 10%, [citation needed] it may reduce shelf-life. [citation needed] Thus, it is separated to ensure longer shelf life of the flour. In contrast to enriched flour, whole wheat flour contains both the bran and the germ.
Wheat, rice and oats start out as whole grains, meaning they include all of the grain’s structure: the bran, endosperm and germ. That provides fiber, vitamins, magnesium and antioxidants ...
Along with the germ, it is an integral part of whole grains, and is often produced as a byproduct of milling in the production of refined grains. Bran is highly nutritious, but is difficult to digest due to its high fiber content; its high fat content also reduces its shelf life as the oils/fats are prone to becoming rancid.
Currently, dry milling is mainly focused on corn-based products for human and animal consumption, or utilized during fuel ethanol production. The main objective of the dry-milling process is to separate the endosperm, which is mainly composed of starch, from the germ and pericarp fibers as much as possible.
Each domain (WGA.A, WGA.B, WGA.C, WGA.D) is hevein-like and is stabilized by a disulfide bond. [5] N-acetyl-D-glucosamine in the natural environment of wheat is found in the chitin of insects, and the cell membrane of yeast & bacteria. WGA is found abundantly—but not exclusively—in the wheat kernel, where it got the 'germ' name from.