Method for producing cold-water-soluble starch comprising V-type crystals

A method, comprising:

• 1) Adding a starch and 3-45 wt. % of an ethanol aqueous solution to a container, and stirring a mixture of the starch and the ethanol aqueous solution in the container, thus yielding a starch-ethanol-water, wherein a mass ratio of the starch to the ethanol aqueous solution in the container is between 1:0.3 and 1:1.1, and the starch-ethanol-water has a mass concentration of 47-75%;
• 2) Introducing the starch-ethanol-water to an extruder and producing a noodle extrudate, wherein the extruder comprises 3 continuous temperature control areas:
• a first area having a temperature of 50° C., a second area having a temperature of between 95 and 120° C., and a third area having a temperature of 60° C.;
• a rotation speed of a screw of the extruder is 70-150 rpm;
• and the noodle extrudate is cylindrical and has a diameter of 0.2-0.5 cm and a length of 5-10 cm;
• 3) Pressing and roll slitting the noodle extrudate, thus yielding a plurality of slices having a side length of 2-6 cm;
• and
• 4) drying the plurality of slices in a microwave vacuum oven, cooling, and pulverizing the plurality of slices cooled using a pulverizer.