Optimization of Extrusion Process for Production of Ginseng-Corn Pellets

Ginseng-corn pellets were made from corn meal and ginseng powder by repeating extrusion twice.The extrusion process was optimized using a three-variable,three-level response surface design.Second extrusion temperature had the greatest effect on cooking tolerance of extruded pellets followed by water addition and first extrusion temperature.The optimum extrusion conditions the provided the best cooking tolerance(93.14%) were extrusion at 140 ℃ and re-extrusion at 105 ℃ with the addition of 22.5% water.Under these conditions,excellent texture properties were obtained.