압출성형 조건이 옥수수 섬유질의 성질변화에 미치는 영향

Corn fiber was extruded to investigate the change in properties of corn fiber. Moisture content and screw speed were adjusted to 20, 30% and 150, 200 rpm. Barrel temperature and feed rate were fixed to 160oC and 120 g/min. Crude ash, crude fat and crude protein were decreased by extrusion process. Reducing sugar and starch content, total polyphenolic compound, DPPH radical scavenging activity, enzyme sensibility and water soluble index were increased by extrusion process. Especially, water soluble index was increased over four fold (from 3.56 to 14.47%) and the highest was at 20% moisture content. The enzyme sensibility in Viscozyme L was the highest at 20% of moisture content and 200 rpm of screw speed. When moisture content increased from 20 to 30%, specific mechanical energy input, expansion index, water soluble index decreased while specific length and water absorption index increased.