Method for preparing pregelatinized starch from sweet potato starch

Abstract

The invention discloses a method for preparing pregelatinized starch from sweet potato starch. The method is characterized by comprising the following steps: step 1, adding a certain amount of sweet potato starch and an ethyl alcohol solution into a ball milling barrel, carrying out mixing under stirring and then carrying out drying so as to obtain preliminarily activated starch; step 2, subjecting the preliminarily activated starch prepared in the step 1 to crushing and sieving and then mixing the preliminarily activated starch, a functional aid, a surfactant and water under stirring so as to obtain secondarily activated starch; step 3, adding sodium bicarbonate into the secondarily activated starch prepared in the step 2 and carrying out a stirring reaction so as to obtain pregelatinized starch; and step 4, subjecting the pregelatinized starch prepared in the step 3 to microwave drying in a microwave drying machine and crushing the dried pregelatinized starch with a pulverizer so as to obtain a final product. According to the method in the invention, ethanol is used as a medium, preliminary activation is carried out on the starch by using a mechanical activation method, and then chemical activation is carried out, so the process of activation is more thorough.

Description

technical field [0001] The invention belongs to the field of pregelatinized starch preparation and relates to a method for preparing pregelatinized starch from sweet potato starch. Background technique [0002] The process of starch pregelatinization is divided into mechanical activation and chemical activation. Traditionally, mechanical activation is commonly used. Mechanical activation is achieved by ball milling. Ball milling uses the impact of balls to mechanically activate and pulverize materials. Traditional ball milling The method is to use zirconia as the ball milling medium. After the ball milling, the crystal structure of the starch is destroyed, changing from a polycrystalline structure to an amorphous structure. At the same time, it also causes changes in the molecular chain arrangement and molecular weight arrangement of the starch, which leads to starch modification, and then changes The gelatinization and rheological properties of starch, etc., but a single me...

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Problems solved by technology

[0002] The process of starch pregelatinization is divided into mechanical activation and chemical activation. Traditionally, mechanical activation is commonly used. Mechanical activation is achieved by ball milling. Ball milling uses the impact of balls to mechanically activate and pulverize materials. Traditional ball milling The method is to use zirconia as the ball milling medium. After the ball milling, the crystal structure of the starch is destroyed, changing from a polycrystalline structure to an amorphous structure. At the same time, it also causes changes in the molecular chain arrangement and molecular weight arrangement of the starch, which leads to starch modification, and then changes The gelatinization and rheological properties of starch, etc., but a single mechanical activation method and chemical method sometimes cannot fully meet the activation requirements