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A kind of reversible swellable starch prepared by first high crosslinking and then high temperature water bath treatment and method

A high-temperature water, high-crosslinking technology, applied in the field of expanded starch, can solve the problems of high viscosity, unfavorable industrial production, large amount of ethanol and alkali, etc., and achieve the effect of excellent product quality, good product quality and zero emission

Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, as long as the preparation of amorphous starch is based on ordinary corn starch, the preparation method of pregelatinized starch or granular cold water soluble starch has the following disadvantages: (1) starch cannot achieve reversible expansion and has a high viscosity, which is difficult to be used as Drug carrier or wound dressing; (2) The preparation method requires a large amount of ethanol and alkali, and the complex process is not conducive to industrial production
In addition, the expansion rate of porous starch that can be applied to drug loading does not meet the actual needs

Method used

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  • A kind of reversible swellable starch prepared by first high crosslinking and then high temperature water bath treatment and method
  • A kind of reversible swellable starch prepared by first high crosslinking and then high temperature water bath treatment and method
  • A kind of reversible swellable starch prepared by first high crosslinking and then high temperature water bath treatment and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) In 1000 g of corn starch milk with a mass concentration of 45%, adjust the pH value of the starch milk to 12 with 1M sodium hydroxide solution at 30°C, and then add anhydrous sodium sulfate accounting for 1% of the dry weight of the starch , keep stirring for 30min for pre-expansion;

[0044] (2) Add STMP / STPP (sodium trimetaphosphate / sodium tripolyphosphate, the mass ratio of STMP to STPP is 99:1) with 1% starch mass in step (1) and keep for 180min;

[0045] (3) Add 1M HCl (hydrochloric acid) to step (2) to adjust the pH of the starch milk to 6.5, and add water (tap water is enough) to adjust the mass concentration of the starch milk to 20%;

[0046] (4) Treat the starch milk after step (3) in a boiling water bath for 15 minutes;

[0047] (5) Wash the sample twice by centrifugation with water and ethanol respectively, and dry at 45°C until the water content is less than 10%;

[0048] (6) Pulverize to uniform white particles and pass through a 100-mesh sieve to ob...

Embodiment 2

[0059] (1) In the pea starch milk with a mass concentration of 30%, adjust the pH value of the starch milk to 11 with 1M sodium hydroxide solution at 60°C, and then add anhydrous sodium sulfate accounting for 10% of the dry weight of the starch, Pre-expansion was maintained for 180 minutes under constant stirring;

[0060] (2) STMP / STPP (sodium trimetaphosphate / sodium tripolyphosphate, 99:1) with 12% starch mass was added to step (1) and kept for 120 min;

[0061] (3) Add 1M HCl (hydrochloric acid) to step (2) to adjust the pH of the starch milk to 6.5, and add water (tap water is sufficient) to adjust the mass concentration of the starch milk to 10%;

[0062] (4) Treat the starch milk after step (3) in a boiling water bath for 60 minutes;

[0063] (5) Wash the sample twice by centrifugation with water and ethanol respectively, and dry at 45°C until the water content is less than 10%;

[0064] (6) Pulverize to uniform white particles and pass through a 100-mesh sieve to obta...

Embodiment 3

[0072] (1) In the waxy cornstarch milk with a mass concentration of 35%, adjust the pH value of the starch milk to 11.5 with 1M sodium hydroxide solution at 40°C, and then add anhydrous sulfuric acid accounting for 5% of the dry weight of the starch Sodium, keep stirring for 120min for pre-expansion;

[0073] (2) Add STMP / STPP (sodium trimetaphosphate / sodium tripolyphosphate, 99:1) with 4% starch quality to step (1) and keep for 120min;

[0074] (3) Add 1M HCl (hydrochloric acid) to the step (2) to adjust the pH of the starch milk to 6.5, and add water (just tap water) to adjust the concentration of the starch milk to 15%;

[0075] (4) Treat the starch milk after step (3) in a boiling water bath for 30 minutes;

[0076] (5) Wash the sample twice by centrifugation with water and ethanol respectively, and dry at 45°C until the water content is less than 10%;

[0077] (6) Pulverize to uniform white particles and pass through a 100-mesh sieve to obtain a sample.

[0078] The reve...

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Abstract

The invention discloses a reversibly-expandable starch prepared by first high crosslinking and then high-temperature water bath treatment and a method. The method comprises the following steps: adjusting the pH value of starch milk to be 11.0-12.0, then adding anhydrous sodium sulfate, and under the conditions of continuous stirring, keeping the mixed material for 30-180min for pre-expansion; adding STMP or a mixture of STMP and STPP, and keeping the obtained material for 60-240min, wherein the added STMP or the mixture of STMP and STPP accounts for 1-12% of the mass of a starch dry basis; adjusting the pH of the obtained starch milk to be 6-8, adding water to adjust the mass concentration of the starch milk to be 10-15%, and keeping the adjusted starch milk for 15-60min in a boiling waterbath; performing washing; performing drying until the moisture mass content is 10% or less; and performing crushing, and performing sieving. According to the invention, the amorphous reversibly-expandable starch prepared by the method has the properties of repeated expansion in hot and cold water, and at the same time, the starch can maintain a higher expansion rate, lower solubility, and lower viscosity after the starch absorbs water, and can be used as a functional food material or a biochemical medicine carrier.

Description

technical field [0001] The invention relates to swollen starch, in particular to a method for preparing reversible swollen starch by high-crosslinking and then high-temperature water-bath treatment. The method utilizes renewable resource starch as a raw material to produce an amorphous granular starch granule which can be repeated many times in cold and hot water and has high expansion capacity. Background technique [0002] Under the conditions of neutral pH and low temperature, the interaction between starch granules and water includes a reversible swelling process. During this process, starch granules absorb water and play a certain role in water retention. After drying, starch can still return to its original state. Granular state, but this "reversible expansion" is achieved at a relatively low expansion rate. At present, starches with relatively high expansion rate mainly include porous starch, granular cold water soluble starch, and pregelatinized starch. It is report...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B30/00C08B31/00
CPCC08B30/00C08B31/003
Inventor 高群玉寇婷婷
Owner SOUTH CHINA UNIV OF TECH
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