A kind of preparation method of v-shaped granular porous starch

A technology of porous starch and granules, which is applied in the field of starch modification, can solve the problems of limiting the application range of porous starch, limited porous starch adsorption performance, poor water solubility and adsorption performance, etc., and achieves improved reactivity, loose specific surface area and water absorption performance. Improved oil absorption capacity and high adsorption capacity effect

Active Publication Date: 2022-03-25
JIANGNAN UNIV
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Problems solved by technology

[0003] However, due to its special semi-crystalline granular structure, raw starch has poor water solubility and adsorption properties, and its ability to bind to enzymes is weak.
The traditional method directly enzymatically hydrolyzes raw starch to prepare porous starch, which can increase the specific surface area of ​​raw starch and improve its adsorption performance, but the enzymatic hydrolysis efficiency is low, and the prepared porous starch has limited adsorption performance and is still insoluble in water, which limits the use of traditional porous starch. Application range

Method used

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  • A kind of preparation method of v-shaped granular porous starch
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  • A kind of preparation method of v-shaped granular porous starch

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Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1: A kind of preparation method of V-shaped porous starch

[0057] Weigh 40g of ordinary cornstarch and 160g of 50% ethanol and pour them into a high-temperature and high-pressure reactor for reaction. The operating parameters of the high-temperature and high-pressure reactor are: reaction temperature 100°C, reaction speed 500r / min, and reaction time 30min. After cooling down, when the temperature drops to 25°C, continue to add 4mL of mixed enzyme solution to the reaction solution (the amount of mixed enzyme solution added is 66000U / g starch, α-amylase:glucoamylase enzyme activity ratio=1:4), at 45 ℃, 400r / min enzymolysis for 4h, after the end of the enzymolysis, vacuum filter, wash 2-3 times with 95% ethanol, dry at 110℃ for 2h, crush, pass through 80 mesh sieve to get V-type porous starch . The specific surface area of ​​the V-shaped porous starch is 39.94㎡ / g, the average pore diameter is 27.61nm, the oil absorption rate is as high as 528.58%, and the wate...

Embodiment 2

[0058] Embodiment 2: a kind of preparation method of V-shaped porous starch

[0059] Weigh 40.00g of ordinary cornstarch and 160.00g of 60% ethanol and pour them into a high-temperature and high-pressure reactor for reaction. The operating parameters of the high-temperature and high-pressure reactor are: reaction temperature 130°C, reaction speed 500r / min, and reaction time 30min. After cooling down, when the temperature drops to 45°C, continue to add 4mL of mixed enzyme solution to the reaction solution (the amount of mixed enzyme solution added is 66000U / g starch, α-amylase:glucoamylase enzyme activity ratio=1:4), 45°C , enzymolysis under the condition of 300r / min for 6h, after the end of the enzymolysis, use a vacuum filter to filter, wash with 95% ethanol for 2-3 times, dry at 110°C for 2h, crush and pass through a 80-mesh sieve. Obtained V-type porous starch. The specific surface area of ​​the V-shaped porous starch is 9.99㎡ / g, the average pore diameter is 26.48nm, the o...

Embodiment 3

[0060] Embodiment 3: a kind of preparation method of V-shaped porous starch

[0061] Weigh 40.00g of ordinary cornstarch and 160.00g of 50% ethanol and pour them into a high-temperature and high-pressure reactor for reaction. The operating parameters of the high-temperature and high-pressure reactor are: reaction temperature 100°C, reaction speed 500r / min, and reaction time 30min. After cooling down, when the temperature drops to 25°C, continue to add 4mL of mixed enzyme solution to the reaction solution (the amount of mixed enzyme solution added is 66000U / g starch, α-amylase:glucoamylase enzyme activity ratio=1:4), 25°C , under the condition of 900r / min for 6h, after the end of the enzymolysis, vacuum filter, wash 2-3 times with 95% ethanol, dry at 110°C for 2h, pulverize and pass through 80 mesh sieve to get V-shaped porous starch. The specific surface area of ​​the V-shaped porous starch is 14.97㎡ / g, the average pore diameter is 27.1274nm, the oil absorption rate is as hig...

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Abstract

The invention discloses a method for preparing V-shaped granular porous starch, which belongs to the technical field of starch modification. The method is to firstly treat starch with a high-temperature alcohol method to prepare V-type starch; then, enzymatically hydrolyze the V-type starch in an ethanol system to prepare V-type porous starch; the temperature in the high-temperature alcohol method is 100-150°C; The enzymatic hydrolysis uses a mixed enzyme solution of α-amylase and glucoamylase. In the present invention, a V-shaped porous starch is prepared by using high-temperature, high-pressure alcohol method and enzymatic hydrolysis method to jointly treat starch. The porous starch has a V-shaped crystal structure of a single helix and has a higher specific surface area, so its water absorption and oil absorption capacity Compared with the porous starch prepared by the traditional method, it is obviously improved.

Description

technical field [0001] The invention relates to a method for preparing V-shaped granular porous starch, which belongs to the technical field of starch modification. Background technique [0002] Porous starch is usually a safe green porous material obtained from ungelatinized raw starch granules through the synergistic action of various enzymes below the gelatinization temperature. Porous applications include: microencapsulation applications and adsorption applications. For example, porous starch can be used as a microcapsule core material to embed and adsorb target substances. The target substances include unstable substances such as easily oxidized and decomposed in the air, oils, pharmaceuticals or pesticides with slow-release function, Wide range of applications. [0003] However, due to its special semi-crystalline granule structure, raw starch has poor water solubility and adsorption properties, and its ability to bind to enzymes is weak. The traditional method dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00C08L3/02C08B30/12C12P19/04C12P19/14
CPCC08J9/00C08B30/12C12P19/04C12P19/14C08J2303/02
Inventor 周星金征宇常庆王韧王金鹏赵建伟焦爱权龙杰
Owner JIANGNAN UNIV
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