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Corn starch was treated with raw moisture(30%),screw speed(160 rpm),extrusion temperature(30,55,80,105,130,and 155℃),and emulsifier(1.2%)to produce the starch extrudate particles in a twin screw extruder.The influence of extrusion processing and composition(starch and emulsifier content)on the viscosity,microstructure,solubility,swell-ing power,and thermal stability of starch extrudate particles was examined.