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Method for preparing high-substitution-degree acetylated starch by coupling electric field with ultrasound waves

A technology of electric field coupling and high substitution, which is applied in the field of starch compound modification and application, can solve the problems of affecting product performance, environmental pollution, and severe toxicity, and achieve the reduction of paste temperature, increase of economic and social value, and easy paste effect

Inactive Publication Date: 2020-06-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the synthesis of starch esters using organic matter as raw materials, because it is highly toxic and expensive, and it will produce a strong odor during the preparation process, causing serious environmental pollution.
[0005] The impact of the ultrasonic process on starch is mainly that the frequency of the ultrasonic wave is greater than 20kHz. Under the microscopic environment, it can cause cavitation in the elastic medium and then produce cavitation bubbles. In addition, under the action of ultrasound, mechanical heat generation will also affect the performance of the product.

Method used

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  • Method for preparing high-substitution-degree acetylated starch by coupling electric field with ultrasound waves
  • Method for preparing high-substitution-degree acetylated starch by coupling electric field with ultrasound waves
  • Method for preparing high-substitution-degree acetylated starch by coupling electric field with ultrasound waves

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Embodiment 1

[0033] A method for preparing acetylated starch with high degree of substitution by electric field coupling ultrasound, comprising the steps of:

[0034] (1) Potato starch is configured into starch milk with a mass concentration of 30%;

[0035] (2) Put the starch milk in a 20kV electric field for 30 minutes, then ultrasonically treat it in a 660W ultrasonic water bath for 30 minutes, and control the ultrasonic temperature at 30°C;

[0036] (3) Place the treated starch milk in a water bath at 30°C with magnetic stirring (300rpm) for 5min, add acetic anhydride with 12% starch mass dropwise, and maintain the pH of the reaction system with 4% (w / w) NaOH solution The value is between 8.0 and 8.5, and the process needs to be completed within 0.5h. Continue to maintain the pH at 8.0 to 8.5 and stir for 1 hour;

[0037] (4) After the reaction was completed, the pH was adjusted to 6.5 with 10 wt% hydrochloric acid, washed 3 times with distilled water, and the reaction product was pl...

Embodiment 2

[0039] Compared with the potato acetate starch of Example 1, the processing method of Example 2 is the same as that of Example 1 except that it does not undergo electric field and ultrasonic pretreatment, and the potato acetate starch substitution degree and disintegration prepared by Example 1 and Example 2 Value, recovery value, gelatinization temperature and enthalpy value determination result are as follows table 1:

[0040] Determination of the degree of substitution, adhesiveness and thermal properties of acetylated starch with high degree of substitution: use titration method to determine the degree of substitution of acetylated starch; use distilled water to make starch milk with a mass fraction of 6%, and use Brabender (Micro Visco-Amylo-Graph) The gelatinization properties of starch were analyzed by an analyzer; starch and water were added into an aluminum pan at a ratio of 3:7 (w / w), and the thermal properties were analyzed by a differential calorimetry scanner (DSC-...

Embodiment 3

[0045] A method for preparing acetylated starch with high degree of substitution by electric field coupling ultrasound, comprising the steps of:

[0046](1) Waxy cornstarch is configured into starch milk with a concentration of 30%;

[0047] (2) Put the starch milk in an 800W ultrasonic water bath for ultrasonic treatment for 45 minutes, the ultrasonic temperature was controlled at 35°C, and then treated in a 30kV electric field for 45 minutes;

[0048] (3) Place the treated starch milk in a water bath at 30° C. for 5 minutes with magnetic stirring (300 rpm), add acetic anhydride with 10% starch quality dropwise, and maintain the reaction system with 4% (w / w) NaOH solution. The pH value is between 8.0 and 8.5, and the process needs to be completed within 0.5 hours. Continue to maintain the pH at 8.0 to 8.5 and stir for 1 hour;

[0049] (4) After the reaction was completed, the pH was adjusted to 6.5 with 10% hydrochloric acid, washed three times with distilled water, and the...

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Abstract

The invention discloses a method for preparing high-substitution-degree acetylated starch by coupling an electric field with ultrasound waves. The method comprises the following steps: with various starches as raw materials, preparing starch milk with a certain concentration from the starches by using distilled water, carrying out treatment with an electric field and ultrasound waves, then puttinga sample in a water bath kettle for magnetic stirring, adding acetic anhydride, maintaining the pH value of a reaction system by uisng a NaOH solution, conducting an acetylation reaction, and successively performing drying, smashing and sieving to obtain solid powder, namely the high-substitution-degree acetylated starch. According to the invention, rearrangement of starch molecules is promoted through the cavitation effect of the ultrasound waves, and combination of acetyl and starch molecules is promoted through the coupling effect of the electric field and the ultrasound waves. The preparation process of the high-substitution-degree acetylated starch is safe and short in consumed time, a particle structure is reserved, elution is easy, the obtained starch is good in ageing resistance,and the gelatinization temperature of the starch is reduced. The high-substitution-degree acetylated starch can be used for preparing a disintegrating agent, an adhesive and a filter membrane.

Description

technical field [0001] The invention belongs to the field of starch composite modification and application, and relates to acetylated starch with a high degree of substitution and a preparation method thereof, in particular to acetylated starch prepared by electric field coupling ultrasonic treatment of starch and a preparation method thereof. Background technique [0002] Starch acetate is considered to be the simplest and most researched type of starch ester. The introduction of a small amount of acetyl groups into the starch molecule prevents or reduces the intermolecular hydrogen bond association, resulting in lower gelatinization temperature and retrogradation of starch. Attenuation, expansion and transparency increase. The acetylated starch prepared by ordinary methods is less than 0.2, and is mainly used in food thickeners. Highly substituted acetylated starches can form water-resistant, thermoplastic, and renewable materials that can find applications in many fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C08B30/12
CPCC08B30/12C08B31/04
Inventor 高群玉曹美芳方桂红
Owner SOUTH CHINA UNIV OF TECH
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