Method for efficiently preparing starch nanocrystalline

A starch nanocrystal and nanocrystal technology, applied in the field of starch processing, can solve the problems of wide amylose dextrin molecular weight distribution, low yield of starch nanocrystals, wide particle size distribution, etc. The effect of high crystallinity

Inactive Publication Date: 2019-01-25
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the wide molecular weight distribution of linear dextrins obtained by debranching, the yield of starch nanocrystals is low, the degree of crystallinity is low, and the particle size distribution is wide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Disperse the waxy rice starch in distilled water so that the starch concentration is 6.0%, stir, place in a boiling water bath and heat for 30 minutes to completely gelatinize the starch, cool to 55°C, adjust the pH to 4.5 with acetate buffer, according to 50U Add pullulanase at the ratio of / g starch, react for 2h, heat in a boiling water bath for 5min to stop the reaction, cool to room temperature, stir the linear dextrin solution at a rate of 50rpm, add ethanol at a rate of 0.5mL / min through a peristaltic pump to make the solution The volume ratio of strepdextrin solution to ethanol is 3:1, continue to stir for 10min, let stand at 4°C for 1h, centrifuge at 10000×g for 5min at 4°C, discard the precipitate; Add ethanol at a high speed so that the volume ratio of linear dextrin solution to ethanol is 1:3, continue to stir for 10 min, let stand at 4°C for 1 h, centrifuge at 10000×g for 5 min, discard the supernatant, and disperse the obtained precipitate in water. Prepar...

Embodiment 2

[0019] Disperse waxy cornstarch in distilled water so that the starch concentration is 8.0%, stir, place in a boiling water bath and heat for 30 minutes to completely gelatinize the starch, cool to 55°C, adjust the pH to 4.5 with acetate buffer, and use 50U Add pullulanase at the ratio of / g starch, react for 2h, heat in a boiling water bath for 5min to stop the reaction, cool to room temperature, stir the linear dextrin solution at a rate of 50rpm, add ethanol at a rate of 0.5mL / min through a peristaltic pump to make the solution The volume ratio of strepdextrin solution to ethanol is 3:1, continue to stir for 10min, let stand at 4°C for 1h, centrifuge at 10000×g for 5min at 4°C, discard the precipitate; Add ethanol at a high speed so that the volume ratio of linear dextrin solution to ethanol is 1:3, continue to stir for 10 min, let stand at 4°C for 1 h, centrifuge at 10000×g for 5 min, discard the supernatant, and disperse the obtained precipitate in water. Prepare 100 mL o...

Embodiment 3

[0021] Disperse the waxy rice starch in distilled water so that the starch concentration is 7.0%, stir, place in a boiling water bath and heat for 30 minutes to completely gelatinize the starch, cool to 55°C, adjust the pH to 4.5 with acetate buffer, according to 50U Add pullulanase at the ratio of / g starch, react for 2h, heat in a boiling water bath for 5min to stop the reaction, cool to room temperature, stir the linear dextrin solution at a rate of 50rpm, add ethanol at a rate of 0.5mL / min through a peristaltic pump to make the solution The volume ratio of strepdextrin solution to ethanol is 3:1, continue to stir for 10min, let stand at 4°C for 1h, centrifuge at 10000×g for 5min at 4°C, discard the precipitate; Add ethanol at a high speed so that the volume ratio of linear dextrin solution to ethanol is 1:3, continue to stir for 10 min, let stand at 4°C for 1 h, centrifuge at 10000×g for 5 min, discard the supernatant, and disperse the obtained precipitate in water. Prepar...

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PUM

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Abstract

The invention provides a method for efficiently preparing starch nanocrystalline, and belongs to the field of starch processing. The method combines the techniques of waxy starch debranching to prepare straight-chain dextrin, the molecular weight distribution of straight-chain dextrin is narrowed through classification, self-assembly of straight-chain dextrin is accelerated by combining polyethylene glycol precipitation to form starch nanocrystalline, and the starch nanocrystalline is prepared. The method mainly comprises the steps that waxy starch is dextrinized, pullulanase is debranched toobtain a straight-chain dextrin solution, ethyl alcohol is added while stirring is conducted till the volume ratio of the straight-chain dextrin solution to ethyl alcohol is 3 to 1, the mixed solutionis continuously stirred for 10 min and standing for 1 h at the temperature of 4 DEG C, centrifugation is conducted, and the sediment is removed; ethyl alcohol is slowly added continuously in the supernatant liquid till the volume ratio of straight-chain dextrin to ethyl alcohol is 1 to 3, stirring is conducted continuously for 10 min, the obtained product is standing for 1 h at the temperature of4 DEG C, centrifugation is conducted, and straight-chain dextrin sediment is obtained; straight-chain dextrin is dispersed in water, the straight-chain dextrin solution with the concentration being 4.0-8.0% is prepared, polyethylene glycol is added in the straight-chain dextrin solution at the proportion of 40.0-50.0 g to 100 mL, the mixture is heated and stirred till polyethylene glycol is completely dissolved, the product is cooled to be 4 DEG C and standing for 1-2 h at the temperature of 4 DEG C, centrifugation is conducted to obtain the sediment, the residual polyethylene glycol is washed through trichloromethane, the product is blasted and dried for 5 min at the temperature of 40 DEG C, and the starch nanocrystalline is obtained.

Description

technical field [0001] The invention discloses a method for efficiently preparing starch nanocrystals, which involves the technology of ethanol step-by-step precipitation and graded dextrin and the technology of accelerating the recrystallization rate of linear dextrin with polyethylene glycol, and belongs to the field of starch processing. Background technique [0002] Starch nanocrystals can be used as particle emulsifiers, material fillers, etc., and have a wide range of applications in food, materials, and other fields. Traditional starch nanocrystals are prepared by acid hydrolysis of starch, but this method takes a long time and the yield is low. In recent years, starch nanocrystals have been prepared using linear dextrin recrystallization technology, that is, after starch gelatinization, starch is debranched to obtain linear dextrins, and starch nanocrystals are formed by self-assembly of linear dextrins. Compared with the acid hydrolysis method, the method shortens ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/06C08B30/04C12P19/16C12P19/04
CPCC08B30/04C08B30/06C12P19/04C12P19/16
Inventor 胡秀婷刘成梅黄兆华罗舜菁吴建永
Owner NANCHANG UNIV
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