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Method for producing amorphous particulate form starch by using impulse electric field

A technology of pulsed electric field and amorphous particles, which is applied in the field of preparing amorphous granular starch by treating starch milk with high-intensity pulsed electric field, can solve the problems not involving amorphous granular starch, and reduce cleaning and sewage treatment and energy consumption Effects of small size and short preparation time

Inactive Publication Date: 2008-10-29
SOUTH CHINA UNIV OF TECH
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  • Summary
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Problems solved by technology

None of the aforementioned patent technologies involves the method of preparing amorphous granular starch by means of strong pulsed electric field treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix cornstarch and water in a mass ratio of 1:2 (1.0 kg in total), stir for 0.1 h, add 0.015 g of sodium chloride, stir and mix well, so that the conductivity of the starch milk is 100 μS / cm. Pump the mixed starch milk into the pulse electric field device with a continuous constant current pump, and at the same time adjust the electric field strength to 40kV / cm, the pulse width to 10μs, the pulse frequency to 1000Hz, the pulse waveform to a square wave, and the pulse processing time to 10ms. Collect and process the resulting starch milk to filter, crush the filter cake, and dry in an oven at 40°C until the starch balance moisture is below. Pass through a 120-mesh sieve to obtain an amorphous granular starch product. The amorphization rate of the obtained product was 30%.

Embodiment 2

[0028] Mix tapioca starch and water in a mass ratio of 1:5 (1.0 kg in total), stir for 1 hour, add 0.023 g of potassium chloride, stir and mix well, so that the conductivity of the starch milk is 300 μS / cm. Pump the mixed starch milk into the pulse electric field device with a continuous constant current pump, and at the same time adjust the electric field strength to 50kV / cm, the pulse width to 50μs, the pulse frequency to 100Hz, and the pulse processing time to 200ms. The obtained starch milk is collected and filtered, the filter cake is crushed, and air-dried to below the equilibrium water content of the starch. Cross 100 mesh sieves to obtain amorphous granular starch products. The amorphization rate of the obtained product was 50%.

Embodiment 3

[0030] Mix sweet potato starch and water in a mass ratio of 1:6 (1.0 kg in total), stir for 1.5 hours, add 0.032 g of potassium sulfate, stir and mix well, so that the conductivity of the starch milk is 500 μS / cm. Pump the mixed starch milk into the pulse electric field device with a continuous constant current pump, and at the same time adjust the electric field strength to 45kV / cm, the pulse width to 80μs, the pulse frequency to 500Hz, and the pulse processing time to 300ms. The obtained starch milk is collected and processed, filtered, the filter cake is crushed, and dried by a drum until the starch equilibrium moisture is below. Cross 100 mesh sieves to obtain amorphous granular starch products. The amorphization rate of the obtained product was 80%.

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Abstract

The invention discloses a method for preparing non-crystallized starch granules by using a pulse electric field. The method comprises the following steps: mixing starch with water at room temperature; stirring to form uniform starch suspension; adding electrolytes into the starch suspension until the electrical conductivity of the starch suspension is in the range of 50-2000 MuS / cm; pumping the starch suspension into a processor of the pulse electric field for non-crystallization treatment under such conditions that the electrical field intensity is 40-60 kV / cm, the pulse width is 10-100 Mus, the pulse frequency is 10-1000 Hz, the pulse waveform is square wave and the time of pulse electric field treatment is 1-1000 ms; and filtering, drying, pulverizing and screening the non-crystallized starch suspension to produce the final product. The non-crystallized starch granules are prepared at a temperature below the starch gelatinization temperature in the pulse electric field. The method has a short preparation cycle; prevents the adverse effects caused by the addition of a large amount of chemical reagents and high-temperature heating; and realizes high non-crystallization degree.

Description

technical field [0001] The invention relates to a method for preparing amorphous granular starch, in particular to a method for preparing amorphous granular starch by treating starch milk with a high-intensity pulse electric field. Background technique [0002] At present, although there are many kinds of starch products, they can be divided into two categories in terms of physical properties, one is polycrystalline granular products with both crystallinity and granularity; the other is neither crystalline It is an amorphous gelatinized product without granularity. Although starch and modified starch products in these two states of matter have been widely used, they still have relatively large deficiencies and defects in structure and properties. Polycrystalline granular starch has both crystallinity and granularity, so it is easy to carry out post-processing such as separation, purification, dehydration, drying and crushing, and can produce high-purity products to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L3/02C08K3/00
Inventor 曾新安张本山韩忠
Owner SOUTH CHINA UNIV OF TECH
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