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KMID : 1134820130420030427
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Journal of the Korean Society of Food Science and Nutrition
2013 Volume.42 No. 3 p.427 ~ p.433
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Effects of Feed Moisture on the Physicochemical Properties of Extruded Corn Fibers
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Kim Cheol-Hyun
Ryu Gi-Hyung
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Abstract
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This study was designed to examine changes in the physicochemical properties of extruded corn fibers with different amounts of feed moisture (30, 40, and 50%). The screw speed and die temperature were fixed to 200 rpm and 140oC, respectively. The crude ash, fat, and protein in corn fiber decreased from the extrusion process. The insoluble dietary fiber in corn fibers decreased, while soluble dietary fiber increased at a feed moisture of 30%. The specific length of the extruded corn fiber increased while the specific mechanical energy input, density, breaking strength, and elastic modulus decreased. The water absorption index (WAI) and reducing sugar content of the corn fibers did not significantly change, but the water soluble index (WSI) decreased as the feed moisture content of the corn fiber increased. On the other hand, the WAI of de-starched corn fiber decreased while WSI and reducing sugars increased as the feed moisture content of the corn fiber increased.
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KEYWORD
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corn fiber, extrusion, moisture content, dietary fiber, SME input
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