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Method for dissolving corn starch and method for detecting turning radius and molecular weight distribution of corn starch

A technology of molecular weight distribution and corn starch, applied in the field of detecting the radius of gyration and molecular weight distribution of corn starch, and dissolving corn starch, can solve the problems of improved molecular weight distribution detection accuracy, harsh dissolution conditions, long dissolution time, etc., to solve the problem of long dissolution time , Short dissolution time, good reproducibility

Inactive Publication Date: 2019-05-31
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a method for dissolving cornstarch to solve the problems of long dissolving time, harsh dissolving conditions and poor dissolving effect of existing starch dissolving methods
[0005] The second object of the present invention is to provide a method for detecting the radius of gyration and molecular weight distribution of cornstarch to solve the problem in the prior art that the detection accuracy of molecular weight distribution needs to be improved due to the poor dissolution effect of cornstarch

Method used

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  • Method for dissolving corn starch and method for detecting turning radius and molecular weight distribution of corn starch
  • Method for dissolving corn starch and method for detecting turning radius and molecular weight distribution of corn starch
  • Method for dissolving corn starch and method for detecting turning radius and molecular weight distribution of corn starch

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Accurately weigh 20 mg of cornstarch into a 20 mL sample bottle, add 40 μL of 80% ethanol to wet the starch, tighten the screw cap of the sample bottle, and stir magnetically at 200 rpm for 5 min at room temperature. Add 2.0 mL DMSO dropwise to the vial, and continue magnetic stirring at 200 rpm for 30 min at room temperature. Afterwards, the samples were subjected to ultrasonic treatment for 2.5 min, in which the ultrasonic frequency was 40KHz and the ultrasonic power was 80 W. Finally, magnetic stirring at 160 rpm in a boiling water bath at 100 °C for 30 min can obtain a completely dissolved cornstarch solution.

[0048] This method is compared with the method of Comparative Example 1, and the results are shown in Table 2:

[0049] Table 2 Comparison table of corn starch dissolution methods

[0050]

Embodiment 2

[0052] Accurately weigh 20 mg of cornstarch into a 20 mL sample bottle, add 30 μL of 80% ethanol to wet the starch, tighten the screw cap of the sample bottle, and stir magnetically at 200 rpm for 5 min at room temperature. Add 2.0 mL DMSO dropwise to the vial, and continue magnetic stirring at 200 rpm for 30 min at room temperature. Afterwards, the samples were subjected to ultrasonic treatment for 2.5 min, in which the ultrasonic frequency was 40KHz and the ultrasonic power was 80 W. Finally, magnetically stir at 160 rpm for 30 min in a boiling water bath at 100 °C.

Embodiment 3

[0054] Accurately weigh 20 mg of cornstarch into a 20 mL sample bottle, add 50 μL of 80% ethanol to wet the starch, tighten the screw cap of the sample bottle, and stir magnetically at 200 rpm for 5 min at room temperature. Add 2.0 mL DMSO dropwise to the vial, and continue magnetic stirring at 200 rpm for 30 min at room temperature. Afterwards, the samples were subjected to ultrasonic treatment for 2.5 min, in which the ultrasonic frequency was 40KHz and the ultrasonic power was 80 W. Finally, magnetically stir at 160 rpm for 30 min in a boiling water bath at 100 °C.

[0055] The starch that adopts embodiment 1~3 and comparative example 2~3 method gain is tested, and result is as follows Figure 3~4 shown. As can be seen from the figure, the AF4-MALS-dRI elution peak signal of the sample obtained by the method of Comparative Example 2 is low, indicating that the corn starch may not be completely dissolved; the AF4-MALS-dRI elution peak of the sample obtained by the method o...

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Abstract

The invention provides a method for dissolving corn starch and a method for detecting the turning radius and molecular weight distribution of the corn starch. The method for dissolving corn starch comprises the steps of adding ethanol into the corn starch to obtain a corn starch paste liquid, then adding dimethyl sulfoxide into the corn starch paste liquid to obtain a corn starch emulsion, performing ultrasonic treatment on the obtained corn starch emulsion, and stirring in a boiling water bath to obtain a corn starch solution. The method for detecting the turning radius and molecular weight distribution of the corn starch comprises a step of detecting the turning radius and molecular weight distribution of the corn starch by detecting the obtained corn starch solution by using the asymmetric field flow separation technology to online use a multi-angle laser light scattering detector and a refractive index detector together. The fully dissolved corn starch solution can be obtained by the methods of the invention, the dissolution time is short, the efficiency is high, the detection result of the turning radius distribution and the molecular weight distribution of the corn starch solution are is more accurate, the reproducibility is good, and the methods have wide application prospects.

Description

technical field [0001] The invention relates to a method for dissolving starch, in particular to a method for dissolving corn starch and a method for detecting the radius of gyration and molecular weight distribution of corn starch. Background technique [0002] Corn is the third largest food crop in the world after wheat and rice, and corn starch production accounts for 94% of the total domestic starch production. Raw corn starch is not only used to prepare modified starch, starch sugar and fermented products, but also can be used as the basic raw material for further processing and production in food, chemical, pharmaceutical and other fields. Characterization of the physicochemical properties of corn starch is essential to obtain commercial products that meet specific functional and sensory specifications. In particular, the characterization of the molecular structure of corn starch can provide important information on the functional, rheological and sensory characterist...

Claims

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Application Information

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IPC IPC(8): G01N21/53G01N21/41B01F1/00B01F13/10
Inventor 窦海洋郭攀攀张文惠宋天歌申世刚
Owner HEBEI UNIVERSITY
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