Comparison of Coarse and Fine Corn Fiber for Corn Fiber Gum Yields and Sugar Profiles

Comparison of Coarse and Fine Corn Fiber for Corn Fiber Gum Yields and Sugar Profiles,10.1094/CCHEM.2000.77.5.560,Cereal Chemistry,Vijay Singh,Landis

Comparison of Coarse and Fine Corn Fiber for Corn Fiber Gum Yields and Sugar Profiles   (Citations: 4)
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Wet-milled corn fiber typically consists of hemicellulose (40%), cellulose (12%), protein (10%), and other substances such as lignin and ash (10%) and a unique oil (3%) that is very different in com- position compared with commercial corn (germ) oil (Moreau et al 1996). Recent research on corn fiber (Doner and Hicks 1997, Doner et al 1998) has shown that a novel alkaline hydrogen peroxide ex- traction process can generate a valuable corn fiber gum (CFG) from the hemicellulose B fraction. Sugar composition of corn fiber gum is mainly D-xylose (48-54%), L-arabinose (33-35%), and small amounts of galactose, glucuronic acid, and glucose (Whistler and BeMiller 1956). Corn fiber gum has several useful properties and can be used in adhesives, thickeners, and stabilizers (Wolf et al 1953), and as film formers and emulsifiers (Whistler 1993) in various food or industrial applications. Most corn fiber is prepared by the corn wet-milling industry, where it is commonly known as white fiber. White fiber is a mixture of corn coarse fiber (also known as pericarp or bran) and the corn fine fiber (or the inner cellular fiber). Most of the research on corn fiber gum (CFG), including yields and sugar composition profiles of the polysaccharide, has been done using white fiber as the starting material. There is lack of information on the corn fiber gum yields and the sugar profiles for individual coarse and fine fiber fractions. This information is important because a process has been de- veloped recently in which coarse fiber (pericarp) can be recovered in a corn dry-grind ethanol process and then can be used as a feed- stock for corn fiber gum extraction (Singh et al 1999). The present conventional corn wet-milling process can be easily modified to re- cover the coarse fiber separately from the fine fiber. This would allow one to take advantage of any unique differences that may occur in the gums from the two fiber fractions for unique applications. In fact, several decades ago, the corn wet-milling process was used to recover fine fiber separately from pericarp fiber (Kerr 1950). In this study, comparison was made for three commercial corn hybrids between the coarse and fine fiber fractions (obtained under controlled laboratory conditions) for corn fiber gum yields and the sugar composition profiles for the polysaccharides.
Journal: Cereal Chemistry - CEREAL CHEM , vol. 77, no. 5, pp. 560-561, 2000
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