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Method for processing porous starch through dual-frequency ultrasonic assisted acid hydrolysis

A dual-frequency ultrasonic, porous starch technology is applied in the processing field of modified starch, which can solve the problems of easy generation of standing waves and reduction of cavitation events, and achieve the effects of reducing dead angles, efficient utilization, and lowering production costs.

Inactive Publication Date: 2013-07-17
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the ultrasonic technology research uses single-frequency ultrasound, but single-frequency ultrasound is more likely to generate standing waves, reducing cavitation events

Method used

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  • Method for processing porous starch through dual-frequency ultrasonic assisted acid hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 300g of cornstarch, make 30% starch milk solution with 700ml of 4% hydrochloric acid solution, place it in a dual-frequency ultrasonic reactor, and continuously stir it in a water bath at 35°C, with ultrasonic power of 800W, and ultrasonic frequencies of 25kHz and 50kHz. 3h, after the reaction, neutralize with saturated sodium carbonate solution, adjust the pH value to neutral, centrifuge at 3000r / min for 20min, separate the supernatant from the precipitate, wash the precipitate repeatedly with water to remove residual sodium chloride and sodium carbonate, Centrifuge again, take the precipitate, dry it in an oven at 40°C, and grind it into powder to obtain a porous starch product.

Embodiment 2

[0028] Weigh 350g of sweet potato starch, use 650ml of 3% hydrochloric acid solution to make a 35% starch milk solution, place it in a dual-frequency ultrasonic reactor, and keep stirring for 4 hours in a water bath at 40°C, with ultrasonic power of 700W, and ultrasonic frequencies of 25kHz and 70kHz. , after the reaction, neutralize with saturated sodium carbonate solution, adjust the pH value to neutral, centrifuge at 3000r / min for 20min, separate the supernatant from the precipitate, wash the precipitate with water repeatedly to remove residual sodium chloride and sodium carbonate, and again Centrifuge, take the precipitate, dry it in an oven at 40°C, and grind it into powder to obtain a porous starch product.

Embodiment 3

[0030] Weigh 400g of mung bean starch, use 600ml of 2% hydrochloric acid solution to make 40% starch milk solution, place it in a dual-frequency ultrasonic reactor, and keep stirring for 5 hours in a water bath at 45°C, with ultrasonic power of 600W, and ultrasonic frequencies of 50kHz and 70kHz. , after the reaction, neutralize with saturated sodium carbonate solution, adjust the pH value to neutral, centrifuge at 3000r / min for 20min, separate the supernatant from the precipitate, wash the precipitate with water repeatedly to remove residual sodium chloride and sodium carbonate, and again Centrifuge, take the precipitate, dry it in an oven at 40°C, and grind it into powder to obtain a porous starch product.

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Abstract

The invention relates to a method for processing porous starch through dual-frequency ultrasonic assisted acid hydrolysis, belonging to the field of modified starch processing. The method comprises the steps of: by taking starch (such as corn starch, sweet potato starch, mung bean starch, chickpeas starch and pea starch) as raw materials, preparing starch milk by using a hydrochloric acid solution with a certain concentration, putting the starch milk in a dual-frequency ultrasonic reactor for ultrasonic processing, stirring continuously, stopping ultrasonic after reaction for a certain time, adjusting the pH value to be neutral by using a saturated sodium carbonate solution, repeatedly centrifugal washing, drying, and grinding to obtain a porous starch product. The porous starch provided by the invention has deep and dense pores with uniform pore size, the pore volume accounts for above 70% of the particle volume, and the porous starch is strong in adsorbability, short in production cycle and low in processing cost, and can be widely applied in the fields of foods, medicine and health care, agriculture, paper making, printing, cosmetics, detergents and the like.

Description

technical field [0001] The invention relates to a method for processing porous starch with dual-frequency ultrasonic assisted acid hydrolysis, which belongs to the field of processing modified starch. Background technique [0002] Porous starch, also known as microporous starch, refers to starch that has been artificially processed to make the granules porous. It is a new type of modified starch. The physical and chemical properties of porous starch are determined by the granule structure. The modified porous starch granules have no significant change in their basic properties, and inherit the good biocompatibility, non-toxic, and biodegradable properties of raw starch. However, compared with native starch, porous starch has larger porosity; larger specific surface area, lower bulk density and particle density; good water and oil absorption capacity; good mechanical strength in dry state; dispersed in water and other solvents It can maintain obvious structural integrity; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/12C08J9/00C08L3/02
Inventor 胡爱军卢静郑捷孙军燕李立孟欣卢秀丽
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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