Method for producing high-flowability pregelatinized starch

Abstract

The invention provides high-flowability pregelatinized starch and a method for preparing the same by mechanical activation, which belong to the technical field of starch modification processing. The method comprises the following steps: uniformly mixing starch and a certain amount of flow aid in a high-speed mixer uniformly, pre-drying the starch by using heat generated in a high-speed mixing process, and controlling the water content in the starch to be lower than 15 percent; and placing the uniformly mixed materials in a ball mill containing a milling medium, well regulating the temperature for constant-temperature dissolution in water, performing mechanical activation for a certain time period, taking the starch out, and sieving the starch with a 80 to 100-mesh sieve. The method has the advantages of simple process and equipment, small investment, environmentally-friendly process, low production cost, easy product quality control and the like. The prepared product has the characteristics of high flowability, loose structure, uniform particles and precision control over pregelatinization degree and can be widely used in industrials and fields of foods, pharmaceuticals, chemicals and the like.

Description

Technical field:

[0001] The invention belongs to a starch physical modification method, and relates to a modified starch and a clean preparation method thereof. Background technique:

[0002] Pregelatinized starch (Pregelatinized Starch) refers to the use of chemical or mechanical methods to make starch granules completely or partially broken in the presence of water, and then dried and modified to improve its solubility, compressibility and fluidity. According to the degree of pregelatinization, it is divided into partially pregelatinized starch (PPS) and whole pregelatinized starch (WPS), and their performance and use function are different: (1) Partially pregelatinized starch contains soluble (gel Chemical) and insoluble components, its cold water solubility is generally 10-20%. After the starch undergoes this "partial pregelatinization" treatment, the ruptured soluble starch granules show strong adhesion, and the insoluble starch granules that remain in their original s...

Examples

Embodiment 1

[0027] After mixing 500g of tapioca starch with a water content of less than 15% and 1g of glidant micropowder silica gel in a high-speed mixer, put them into a ball mill cylinder equipped with zirconia balls for mechanical activation. The mechanical activation temperature is 50°C. The activation time is 10 minutes, and then passed through a 80-100 mesh sieve to obtain pregelatinized starch with a cold water solubility of 15.1% and an angle of repose of 40.2°.

Embodiment 2

[0029] Mix 1000g of tapioca starch with a moisture content of less than 15% and 2g of glidant micropowder silica gel in a high-speed mixer, and then put them into a ball mill cylinder equipped with zirconia balls for mechanical activation. The mechanical activation temperature is 50°C. The activation time is 90 minutes, and then passed through a 80-100 mesh sieve to obtain pregelatinized starch with a cold water solubility of 65.6% and an angle of repose of 37.5°.

Embodiment 3

[0031]Mix 1500g of cornstarch with a water content of less than 15% and 3g of glidant talcum powder in a high-speed mixer, and then put them into a ball mill cylinder equipped with zirconia balls for mechanical activation. The mechanical activation temperature is 50°C. The activation time is 180 minutes, and then passed through a 80-100 mesh sieve to obtain pregelatinized starch with a cold water solubility of 99.4% and an angle of repose of 34.8°.

Technical field:

[0001] The invention belongs to a starch physical modification method, and relates to a modified starch and a clean preparation method thereof. Background technique:

[0002] Pregelatinized starch (Pregelatinized Starch) refers to the use of chemical or mechanical methods to make starch granules completely or partially broken in the presence of water, and then dried and modified to improve its solubility, compressibility and fluidity. According to the degree of pregelatinization, it is divided into partially pregelatinized starch (PPS) and whole pregelatinized starch (WPS), and their performance and use function are different: (1) Partially pregelatinized starch contains soluble (gel Chemical) and insoluble components, its cold water solubility is generally 10-20%. After the starch undergoes this "partial pregelatinization" treatment, the ruptured soluble starch granules show strong adhesion, and the insoluble starch granules that remain in their original s...

Examples

Embodiment 1

[0027] After mixing 500g of tapioca starch with a water content of less than 15% and 1g of glidant micropowder silica gel in a high-speed mixer, put them into a ball mill cylinder equipped with zirconia balls for mechanical activation. The mechanical activation temperature is 50°C. The activation time is 10 minutes, and then passed through a 80-100 mesh sieve to obtain pregelatinized starch with a cold water solubility of 15.1% and an angle of repose of 40.2°.

Embodiment 2

[0029] Mix 1000g of tapioca starch with a moisture content of less than 15% and 2g of glidant micropowder silica gel in a high-speed mixer, and then put them into a ball mill cylinder equipped with zirconia balls for mechanical activation. The mechanical activation temperature is 50°C. The activation time is 90 minutes, and then passed through a 80-100 mesh sieve to obtain pregelatinized starch with a cold water solubility of 65.6% and an angle of repose of 37.5°.

Embodiment 3

[0031]Mix 1500g of cornstarch with a water content of less than 15% and 3g of glidant talcum powder in a high-speed mixer, and then put them into a ball mill cylinder equipped with zirconia balls for mechanical activation. The mechanical activation temperature is 50°C. The activation time is 180 minutes, and then passed through a 80-100 mesh sieve to obtain pregelatinized starch with a cold water solubility of 99.4% and an angle of repose of 34.8°.