CN117624389A - Method for preparing cold water soluble corn starch with assistance of electric field - Google Patents
Method for preparing cold water soluble corn starch with assistance of electric field Download PDFInfo
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- CN117624389A CN117624389A CN202311445545.9A CN202311445545A CN117624389A CN 117624389 A CN117624389 A CN 117624389A CN 202311445545 A CN202311445545 A CN 202311445545A CN 117624389 A CN117624389 A CN 117624389A
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- water soluble
- corn starch
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 230000005684 electric field Effects 0.000 title claims abstract description 52
- 229920002261 Corn starch Polymers 0.000 title claims abstract description 49
- 239000008120 corn starch Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000003513 alkali Substances 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- 239000000839 emulsion Substances 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 40
- 229920002472 Starch Polymers 0.000 claims description 33
- 235000019698 starch Nutrition 0.000 claims description 33
- 239000008107 starch Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 11
- 239000006228 supernatant Substances 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 150000007529 inorganic bases Chemical class 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 238000001704 evaporation Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
- 230000008020 evaporation Effects 0.000 description 9
- 239000002585 base Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 5
- 238000005119 centrifugation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000007602 hot air drying Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 229920000881 Modified starch Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009144 enzymatic modification Effects 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004917 polyol method Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
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- Cereal-Derived Products (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention discloses a method for preparing cold water soluble corn starch by electric field assistance. The method comprises the following steps: the corn starch ethanol emulsion and inorganic alkali are uniformly mixed to form mixed feed liquid, and then the mixed feed liquid is placed in an electric field environment for ethanol-alkali treatment, so that cold water soluble corn starch is prepared. The method for preparing cold water soluble corn starch by electric field assistance provided by the invention is simple to operate, has low requirements on equipment, does not need to operate at high temperature or high pressure, has high product yield, and can effectively improve the preparation efficiency and the product quality of the cold water soluble corn starch.
Description
Technical Field
The invention relates to a preparation method of cold water soluble corn starch, in particular to a method for preparing cold water soluble corn starch by electric field assistance.
Background
The corn starch is the second most renewable resource with the yield inferior to that of cellulose worldwide, has the characteristics of high viscosity, easy modification, low cost, strong degradability and the like, has wide application in industries such as food, medicine, chemical industry, textile, paper making and the like, and is an important development and utilization raw material in all countries of the world.
The natural corn starch has stable crystal structure inside the granule, so that the action capability of external force and chemical reagent on the starch is weakened, and therefore, only slight reversible swelling can occur in cold water, and the application range of the starch is greatly limited. The defects of original starch such as taste, viscosity, aging property and solubility can be changed on the basis of the original performance of the starch by physical modification, chemical modification, enzyme modification and the like, and the application range of the starch is widened. Early soluble starches were primarily pregelatinized starches prepared by disrupting the crystalline structure of the starch during production by heating, improving their water solubility, but with poor stability and substantial loss of granular structure. With the progress of the scientific and technical level, unlike the flaky morphology of pregelatinized starch, granular cold water soluble starch can be dissolved in cold water to form paste, and a good granular structure is maintained, so that the granular cold water soluble starch has higher viscosity after being dissolved in water and is more suitable for production and reprocessing. The main methods at present are a spray drying method, a high-temperature high-pressure alcohol method, a high-pressure polyol method and the like, the requirements on equipment are high, the operation is complex under high temperature or high pressure, the operation of an ethanol-alkali method is simple, but the product yield and the quality of a single method are poor, so that a method capable of improving the preparation efficiency and the product quality of cold water soluble corn starch is needed.
Disclosure of Invention
The invention mainly aims to provide a method for preparing cold water soluble corn starch by electric field assistance, which aims to overcome the defects in the prior art.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the embodiment of the invention provides a method for preparing cold water soluble corn starch by electric field assistance, which comprises the following steps: the corn starch ethanol emulsion and inorganic alkali are uniformly mixed to form mixed feed liquid, and then the mixed feed liquid is placed in an electric field environment for ethanol-alkali treatment, so that cold water soluble corn starch is prepared.
In some preferred embodiments, the method for preparing cold water soluble corn starch with the aid of the electric field specifically comprises the following steps:
mixing corn starch with ethanol solution to obtain starch ethanol solution with concentration of 30-50wt%;
and uniformly mixing the starch alcohol solution with inorganic alkali with the concentration of 8-12 wt% to form the mixed solution.
In some preferred embodiments the concentration of the ethanol solution in the starch alcohol is 50wt% to 80wt%.
In some preferred schemes, the mass ratio of the starch alcohol solution to the inorganic base in the mixed feed solution is 6:1-9:1.
In some preferred embodiments, the method for preparing cold water soluble corn starch with the assistance of the electric field specifically comprises the following steps: and placing the mixed liquid in the electric field environment, and continuously stirring at a stirring speed of 100-250 rpm until the ethanol-alkali treatment is completed.
In some preferred embodiments, the relevant parameters of the electric field environment include: the electric field strength is 600-800V/cm, and the frequency is 50-200 kHz.
In some preferred embodiments, the method for preparing cold water soluble corn starch with the assistance of the electric field specifically comprises the following steps: when the ethanol-alkali treatment is carried out, the electric field power is controlled to ensure that the end temperature of the mixed feed liquid is 45-55 ℃ and the treatment time is 10-25 min.
In some preferred embodiments, the method of electric field assisted preparation of cold water soluble corn starch further comprises: and (3) carrying out post-treatment on the mixed feed liquid subjected to the ethanol-alkali treatment to obtain cold water soluble starch.
Further, the post-processing includes: and (3) centrifuging the ethanol-alkali treated mixed feed liquid at the speed of 2000-3000 rpm for 5-10 min, discarding the supernatant, adding an ethanol solution, adjusting the pH value to 7 with a hydrochloric acid solution, washing with alcohol for 2-3 times, drying at 35 ℃ for 24-30 h, crushing and sieving to obtain powder with the fineness less than or equal to 120 meshes, and obtaining the cold water soluble starch.
Compared with the prior art, the invention has the beneficial effects that:
the method for preparing cold water soluble corn starch by electric field assistance provided by the invention is simple to operate, has low requirements on equipment, does not need to operate at high temperature or high pressure, has high product yield, and can effectively improve the preparation efficiency and the product quality of the cold water soluble corn starch.
Detailed Description
In view of the shortcomings in the prior art, the inventor of the present invention has long studied and put forward a technical solution of the present invention through a great deal of practice, and the technical solution, the implementation process and principle of the technical solution and the like will be further explained with reference to several embodiments. It should be understood, however, that within the scope of the present invention, the above-described technical features of the present invention and technical features specifically described in the following (embodiments) may be combined with each other to constitute new or preferred technical solutions. And are limited to a space, and are not described in detail herein.
In the following examples, unless otherwise specified, various materials, reagents, reaction equipment, test equipment and methods used were obtained by means of commercial purchase and the like.
Example 1 a method for electric field assisted preparation of cold water soluble corn starch comprising the steps of:
(1) Preparing corn starch ethanol emulsion: a starch alcohol solution was prepared from commercially available corn starch and 75wt% ethanol solution at 45wt%.
(2) Ethanol-base treatment: adding sodium hydroxide solution into the starch alcohol solution prepared in the step (1) according to the proportion of 7:1 (w/w), and stirring for 5 min to fully and uniformly mix the solution to obtain mixed feed liquid. The concentration of sodium hydroxide was 10wt%.
(3) Electric field ethanol-base treatment: pumping the mixture prepared in the step (2) into an electric field system, controlling the electric field condition to be 700V/cm, controlling the frequency to be 150 kHz, controlling the end point temperature to be 52 ℃, treating for 20 min, and controlling the stirring speed to be 150 rpm.
(4) And (3) centrifuging: and (3) centrifuging the mixed liquid treated in the step (3), controlling the centrifuging speed to 2500 rpm for 8 min, and separating solid matters from the supernatant after discarding the supernatant.
(5) And (3) neutralization: the solids separated by centrifugation in step (4) were neutralized with 75% by weight ethanol solution in HCl at a concentration of about 3 mol/L, and the pH reached 7.0.
(6) Washing and centrifuging: the neutralized sample was alcohol washed with 75wt% ethanol solution for 2 times, and centrifuged at 2500 rpm for 8 min after each alcohol washing, so that the alcohol washing was more thorough.
(7) And (3) drying: the centrifuged sample was spread on an evaporation pan, placed in a hot air drying oven at 35℃and dried 24. 24 h.
(8) Crushing: the dried sample was crushed by a crusher and sieved to obtain a powder having a fineness of about 120 mesh.
(9) And (3) detection: taking 100 g deionized water in a beaker, weighing 1 g of the powder treated in the step (8), slowly adding the powder into the deionized water under the stirring of 300 rpm, stirring for 20 s, adjusting to 800 rpm, continuously stirring for 120 s, centrifuging at 3000 rpm for 8 min, sucking 25 mL supernatant in a evaporating dish with known weight, and drying at 110 ℃ to constant weight. The Cold Water Solubility (CWS) was calculated as CWS (%) = (m) 2 -m 1 ) X 4/100 where m1 is the evaporation pan mass (g) and m2 is the evaporation pan and sample mass (g) after drying to constant weight. The yield is the percentage of the mass of the powder in the step (8) to the mass of the original starch.
The solubility of the cold water soluble starch in example 1 was 86.72% and the yield was 72.6%.
Comparative example 1 a process for preparing cold water soluble corn starch comprising the steps of:
steps (1) - (2): the same as in steps (1) - (2) of example 1.
Step (3): the beaker is placed into a constant temperature water bath kettle which is regulated to 52 ℃, and the beaker is taken out after stirring at 150 rpm for 60 min.
Steps (4) - (9): the same as in steps (4) to (9) of example 1.
The final product of comparative example 1 had a cold water solubility of 43.2% and a yield of 55.6%. The yield and solubility of comparative example 1 were significantly lower than example 1, while the required production time was 3 times that of example 1.
Example 2 a method for electric field assisted preparation of cold water soluble corn starch comprising the steps of:
(1) Preparing corn starch ethanol emulsion: a starch alcohol solution was prepared from commercially available corn starch and an 80wt% ethanol solution at a concentration of 40wt%.
(2) Ethanol-base treatment: adding sodium hydroxide solution into the starch alcohol solution prepared in the step (1) according to the proportion of 6:1 (w/w), and stirring for 5 min to fully and uniformly mix the solution to obtain mixed feed liquid. The concentration of sodium hydroxide was 12wt%.
(3) Electric field ethanol-base treatment: pumping the mixture prepared in the step (2) into an electric field system, controlling the electric field condition to be 800V/cm, controlling the frequency to be 200 kHz, controlling the end point temperature to be 53 ℃, and treating for 15 min, wherein the stirring speed is 200 rpm.
(4) And (3) centrifuging: and (3) centrifuging the mixed liquid treated in the step (3), controlling the centrifuging speed to be 3000 rpm and the centrifuging time to be 6 min, and separating solid matters from the supernatant after discarding the supernatant.
(5) And (3) neutralization: the solids separated by centrifugation in step (4) were neutralized with 80% by weight ethanol solution in HCl at a concentration of about 3 mol/L, and the pH reached 7.0.
(6) Washing and centrifuging: the neutralized sample was alcohol washed with 80wt% ethanol solution for 2 times, and centrifuged at 3000 rpm for 6 min after each alcohol washing, so that the alcohol washing was more thorough.
(7) And (3) drying: the centrifuged sample was spread on an evaporation pan, placed in a hot air drying oven at 35℃and dried 28. 28 h.
(8) Crushing: the dried sample was crushed by a crusher and sieved to obtain a powder having a fineness of about 120 mesh.
(9) And (3) detection: taking 100 g deionized water in a beaker, weighing 1 g of the powder treated in the step (8), slowly adding the powder into the deionized water under the stirring of 300 rpm, stirring for 20 s, adjusting to 800 rpm, continuously stirring for 120 s, centrifuging at 3000 rpm for 8 min, sucking 25 mL supernatant in a evaporating dish with known weight, and drying at 110 ℃ to constant weight. The Cold Water Solubility (CWS) was calculated as CWS (%) = (m) 2 -m 1 ) X 4/100 where m1 is the evaporation pan mass (g) and m2 is the evaporation pan and sample mass (g) after drying to constant weight. The yield is the percentage of the mass of the powder in the step (8) to the mass of the original starch.
The solubility of the cold water soluble starch in example 2 was 90.66% and the yield was 75.4%.
Comparative example 2 a process for preparing cold water soluble corn starch comprising the steps of:
steps (1) - (2): the same as in steps (1) - (2) of example 2.
Step (3): electric field ethanol-base treatment: pumping the mixture prepared in the step (2) into an electric field system, controlling the electric field condition to be 300V/cm, controlling the frequency to be 40 kHz, controlling the end temperature to be 53 ℃, treating for 15 min, and controlling the stirring speed to be 200 rpm.
Steps (4) - (9): the same as in steps (4) - (9) of example 2.
The final product of comparative example 2 had a cold water solubility of 53.8% and a yield of 60.9%. The solubility and yield of the product of comparative example 2 are significantly lower than those of example 2, and the proper electric field conditions are beneficial to improving the cold water soluble corn starch preparation efficiency and product quality.
Example 3 a method for electric field assisted preparation of cold water soluble corn starch comprising the steps of:
(1) Preparing corn starch ethanol emulsion: a starch alcohol solution was prepared from commercially available corn starch and 70wt% ethanol solution at a concentration of 50wt%.
(2) Ethanol-base treatment: adding sodium hydroxide solution into the starch alcohol solution prepared in the step (1) according to the proportion of 6:1 (w/w), and stirring for 5 min to fully and uniformly mix the solution to obtain mixed feed liquid. The concentration of sodium hydroxide was 8wt%.
(3) Electric field ethanol-base treatment: pumping the mixture prepared in the step (2) into an electric field system, controlling the electric field condition to be 750V/cm, controlling the frequency to be 200 kHz, controlling the end point temperature to be 50 ℃, treating for 25 min, and controlling the stirring speed to be 180 rpm.
(4) And (3) centrifuging: and (3) centrifuging the mixed liquid treated in the step (3), controlling the centrifuging speed to be 3000 rpm and the centrifuging time to be 6 min, and separating solid matters from the supernatant after discarding the supernatant.
(5) And (3) neutralization: the solids separated by centrifugation in step (4) were neutralized with 70wt% ethanol solution in HCl at a concentration of about 3 mol/L, and the pH reached 7.0.
(6) Washing and centrifuging: the neutralized sample was alcohol washed with 70wt% ethanol solution for 2 times, and centrifuged at 3000 rpm for 6 min after each alcohol washing, so that the alcohol washing was more thorough.
(7) And (3) drying: the centrifuged sample was spread on an evaporation pan, placed in a hot air drying oven at 35℃and dried for 30 h.
(8) Crushing: the dried sample was crushed by a crusher and sieved to obtain a powder having a fineness of about 120 mesh.
(9) And (3) detection: taking 100 g deionized water in a beaker, weighing 1 g of the powder treated in the step (8), slowly adding the powder into the deionized water under the stirring of 300 rpm, stirring for 20 s, adjusting to 800 rpm, continuously stirring for 120 s, centrifuging at 3000 rpm for 8 min, sucking 25 mL supernatant in a evaporating dish with known weight, and drying at 110 ℃ to constant weight. The Cold Water Solubility (CWS) was calculated as CWS (%) = (m) 2 -m 1 ) X 4/100 where m1 is the evaporation pan mass (g) and m2 is the evaporation pan and sample mass (g) after drying to constant weight. The yield is the percentage of the mass of the powder in the step (8) to the mass of the original starch.
The solubility of the cold water soluble starch in example 3 was 87.23% and the yield was 73.1%.
Comparative example 3 a process for preparing cold water soluble corn starch comprising the steps of:
steps (1) - (2): the same as in steps (1) - (2) of example 2.
Step (3): electric field ethanol-base treatment: pumping the mixture prepared in the step (2) into an electric field system, controlling the electric field condition to be 900V/cm, controlling the frequency to be 230 kHz, controlling the end point temperature to be 50 ℃, treating for 25 min, and controlling the stirring speed to be 180 rpm.
Steps (4) - (9): the same as in steps (4) - (9) of example 2.
The final product of this comparative example 3 had a cold water solubility of 67.5% and a yield of 62.4. The solubility and yield of the product of comparative example 3 are significantly lower than those of example 3, and the proper electric field conditions are advantageous for improving the cold water soluble corn starch production efficiency and product quality.
It should be understood that the above embodiments are merely for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and implement the same according to the present invention without limiting the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (9)
1. A method for electric field assisted preparation of cold water soluble corn starch comprising: the corn starch ethanol emulsion and inorganic alkali are uniformly mixed to form mixed feed liquid, and then the mixed feed liquid is placed in an electric field environment for ethanol-alkali treatment, so that cold water soluble corn starch is prepared.
2. The method for preparing cold water soluble corn starch with the assistance of an electric field according to claim 1, comprising the following steps:
mixing corn starch with ethanol solution to obtain starch ethanol solution with concentration of 30-50wt%;
and uniformly mixing the starch alcohol solution with inorganic alkali with the concentration of 8-12 wt% to form the mixed solution.
3. The method for electric field assisted preparation of cold water soluble corn starch according to claim 1 or 2, characterized in that: the concentration of the ethanol solution in the starch alcohol solution is 50-80 wt%.
4. The method for electric field assisted preparation of cold water soluble corn starch according to claim 1 or 2, characterized in that: the mass ratio of the starch alcohol solution to the inorganic base in the mixed solution is 6:1-9:1.
5. The method for preparing cold water soluble corn starch with the assistance of an electric field according to claim 1, comprising the following steps: and placing the mixed liquid in the electric field environment, and continuously stirring at a stirring speed of 100-250 rpm until the ethanol-alkali treatment is completed.
6. The method for electric field assisted preparation of cold water soluble corn starch of claim 1 wherein the relevant parameters of the electric field environment include: the electric field strength is 600-800V/cm, and the frequency is 50-200 kHz.
7. The method for preparing cold water soluble corn starch with the assistance of an electric field according to claim 1 or 6, comprising the following steps: when the ethanol-alkali treatment is carried out, the electric field power is controlled to ensure that the end temperature of the mixed feed liquid is 45-55 ℃ and the treatment time is 10-25 min.
8. The method for electric field assisted preparation of cold water soluble corn starch of claim 1 further comprising: and (3) carrying out post-treatment on the mixed feed liquid subjected to the ethanol-alkali treatment to obtain cold water soluble starch.
9. The method of electric field assisted preparation of cold water soluble corn starch of claim 8 wherein said post-treatment comprises: and (3) centrifuging the ethanol-alkali treated mixed feed liquid at the speed of 2000-3000 rpm for 5-10 min, discarding the supernatant, adding an ethanol solution, adjusting the pH value to 7 with a hydrochloric acid solution, washing with alcohol for 2-3 times, drying at 35 ℃ for 24-30 h, crushing and sieving to obtain powder with the fineness less than or equal to 120 meshes, and obtaining the cold water soluble starch.
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