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Normal maize starch combined with lecithin(LEC)was treated at a moisture content of 30%and screw speed of 160 rpm by extrusion processing.Extrusion treatment decreased the X-ray intensities of maize starch,and the diffraction peak type of extrudates was changed from A to A+V.Extrusion processing increased the gelatinization temperature and decreased the gelatinization enthalpy.