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Process of modified starch by powder milling mechanical forec chemistry method

A mechanochemical and starch technology, applied in the field of starch modification, can solve the problems of insufficient use of mechanochemical methods, low pulverization efficiency, and invariance, and achieve enhanced binding capacity, biodegradation speed and biodegradation. The effect of improving the degree and good application prospect

Inactive Publication Date: 2005-01-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two outstanding problems in the application of superfine grinding technology in starch modification in foreign countries: one is basically still limited to the simple mode of material refinement in the traditional sense, and the research mainly focuses on the impact of grinding on the morphology and surface properties of starch granules and crystallization morphology, ignoring the effect of mechanochemical effect on starch modification, and no systematic research reports on gelatinization and rheological properties of starch after grinding
The second is that the effect of grinding conditions on the refinement of starch granules has not been discussed in depth, resulting in low grinding efficiency. Unless combined with other denaturation methods, it will only cause damage to the surface of the granules and the particle size will basically remain unchanged, resulting in mechanochemical methods in starch modification. The role of sexuality is not fully utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take by weighing 200g tapioca starch (dry basis) and 2400g ceramic ball milling medium (d=7mm) respectively and pour in the plastic ball mill jar, then measure 320ml dehydrated ethanol and add in the jar, cover and place the rotating speed of On the 170rpm ball mill, turn on the switch for ball milling. Shut down and observe every 20 hours, and add 20ml of absolute ethanol. After ball milling for 150 hours, stop grinding, take out the starch milk and place it in a storage container, vacuum filter to remove ethanol and recover, dry the obtained wet product of grinding at 40°C, grind, pass through a 200-mesh sieve, and obtain Micronized tapioca starch products.

[0020] Table 1. Changes in median diameter and specific surface area of ​​cassava starch particles after ball milling

[0021] Milling time (hours) particle median diameter (μm) specific surface area (m 2 .g -1 )

[0022] 0 10.78 0.444

[0023] 150 1.38 4.407

[0024] The results in Table ...

Embodiment 2

[0026] Weigh 100g of potato starch (on a dry basis) and 1005g of ceramic balls respectively and pour them into a plastic ball mill jar, wherein the ceramic balls with a diameter of 3mm and 9mm are half and half. Then measure 147ml absolute ethanol and add in the jar, put on the ball mill that rotating speed is 150rpm after covering and tightening, close switch and carry out ball milling. After 16 hours, shut down and observe once, and add 10ml of absolute ethanol. Stop grinding after 25 hours of ball milling, take out the starch milk and place it in a storage container, remove ethanol by vacuum suction filtration and recover, dry the obtained wet product of grinding at 50°C, grind, and pass through a 200-mesh sieve to obtain Micronized potato starch products.

[0027] Observing the starch sample after ball milling for 25 hours with a polarizing microscope, the polarized cross of the granules has completely disappeared, indicating that the crystal structure of the starch has c...

Embodiment 3

[0029]Weigh 200g of potato starch (on a dry basis) and 2240g of ceramic balls and pour them into a plastic ball mill jar, wherein the mass ratio of ceramic balls with a diameter of 5mm and 10mm is 2:1. Then measure 270ml absolute ethanol and add in the jar, put on the ball mill that rotating speed is 100rpm after covering and tightening, close switch and carry out ball milling. After 20 hours, shut down and observe once, and add 50ml of absolute ethanol. Stop grinding after ball milling for 75 hours, take out the starch milk and place it in a storage container, remove ethanol by vacuum suction filtration and recover, dry the obtained wet product of grinding at 45°C, grind, and pass through a 200-mesh sieve to obtain Micronized potato starch products.

[0030] Table 2. The change of apparent viscosity of mung bean starch before and after ball milling for 200h with temperature

[0031] Milling time Weight gain after moisture absorption Dissolving at 40°C Swelli...

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Abstract

The invention discloses a process of preparing modified starch by a mill mechanochemical method, and the method: in a ball-mill kettle, using ball-mill mediums to mill starches dispersed in ball-mill liquor into powder, where the ball-mill kettle is a ceramic or plastic kettle, the ball-mill mediums are made of one or many ones of different-diameter ceramic or agate balls, and the ball-mill liquor is anhydrous alcohol. The invention remarkably changes the crystal structure of starch from polycrystalline state to amorphous state to cause the molecular weight distribution and the content of straight and branched chains, thus changing starch gelatinating property, rheological property, etc, and giving the starch special properties: good soluability, high water absorptivity, sensitive bioreaction activity, having low-viscosity high-solid content glue system, etc.

Description

technical field [0001] The invention relates to a novel starch modification method, in particular, the superfine pulverization technology and the mechanochemical method are coupled for the modification of starch and the preparation of micronization of granules. Background technique [0002] Starch is the main source of carbohydrates for human beings and one of the important industrial raw and auxiliary materials. Because it has the ability of complete biodegradation in various environments, it will not cause environmental pollution, and it is a kind of abundant and cheap biodegradable in nature. Renewable resources have been widely used in various fields. With the rapid development of industrial processing technology and the continuous emergence of new products, many properties of native starch can no longer meet the needs of many application fields, and it is necessary to modify them to meet the application requirements. The current denaturation methods mainly use physical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/00
Inventor 陈玲叶建东胡飞李琳李晓玺庞艳生李冰胡松青
Owner SOUTH CHINA UNIV OF TECH
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