Potentially valuable water soluble bio-fiber gums (hemicellulose B) were prepared from low-valued grain processing by-products, agricultural residues and energy crops by an alkaline extraction followed by ethanol precipitation. The bio-fiber gum (BFGs) from all these sources are very rich in soluble dietary fiber (87.2–93.6%) except from wheat bran and sugarcane bagasse (only 60.3 and 55.5% respectively) and they are predicted to be non-caloric in human diets qualifying as non-caloric food ingredient in many products. The sugar composition of these BFGs showed that they were typical arabinoxylans containing high molar ratio of arabinose to xylose with some other sugars such as galactose, glucose, galacturonic acid and glucuronic acid in the side chains. The yield of pure BFG from these plant materials varied from 2.33 (rice fiber) to 25.13% (corn bran) and they all, except BFG from wheat bran, are very good emulsifiers for stabilizing oil in water emulsions. Their ORAC values ranged from about 7000 to 29,000 μmole Trolox/100 g sample showing that they have the ability to provide antioxidant activity in foods, as well as offering the other functionalities and health-promoting benefits of dietary fiber. The ORAC values of BFGs are higher than their respective original plant materials indicating that the antioxidant-rich portions of the various plant materials can be solubilized and fractionated by the present alkaline extraction process.
Food Hydrocolloids – Elsevier
Published: May 1, 2018
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