Study on expansion properties of extruded giseng by twin-screw extruder

In order to study the properties of twin-screw extrusion for ginseng processing characteristics and use the machine of it to prepare the product.The influence was analyzed of the different moisture contents of white ginseng powder and different temperature of barrel on the expansion rate of extruded,water absorbtion index and the structure.The results showed that the structure of ginseng expanded by twin-screw extrusion,the radial expansion rate of extruded ginseng were 30% of moisture content and 100 ℃ of barrel temperature the highest,and under the same condition the air holes of product was small and well-distribution.The water soluble index(WSI) was increased with higher barrel temperature and with moisture content decreased,WSI was highest at 20% of moisture content and 140 ℃ of barrel temperature,compare with unextruded ginseng powder the WSI enhanced 8.47%.In conclusion,extrusion process can be applied to puffed food using ginseng,meanwhile the rate of extraction of soluble content can be enhanced.