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A wet heat treatment process for obtaining starch nanocrystals from raw starch

A technology of starch nanocrystals and wet heat treatment, which is applied in the fields of starch processing, wet heat treatment and nanomaterials, can solve the problems that have not yet been unified, and have not yet been unified, and achieve the effect of promoting further industrialization

Active Publication Date: 2020-12-08
ZHEJIANG UNIV
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Problems solved by technology

At present, the research on the influence of heat and humidity treatment on the morphology and crystallinity of starch granules has not yet reached a unified conclusion.
According to the existing research, moist heat treatment can cause different degrees of damage to the surface of starch granules, but because different scholars often use different moist heat treatment conditions, the research on the influence of moist heat treatment on starch crystallinity has not yet reached a unified conclusion

Method used

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  • A wet heat treatment process for obtaining starch nanocrystals from raw starch
  • A wet heat treatment process for obtaining starch nanocrystals from raw starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] First, take 20g of absolutely dry commercially available waxy cornstarch in a 500ml vial with a screw cap, add 5.3ml of distilled water, store overnight at 4°C, pass through a 100-mesh sieve, and carry out moist heat treatment. The conditions for moist heat treatment are: 96.3°C, the time is 2.43h. It was determined that after heat and humidity treatment, the starch crystallinity was 42.4%.

[0023] The wet-heated starch is fully dried in a blast drying oven at 40° C. to obtain waxy cornstarch after wet-heat treatment.

[0024] The starch obtained after the wet heat treatment was hydrolyzed with sulfuric acid, and after hydrolysis for 4 days, the obtained solution was centrifuged and sedimented.

[0025] The starch was washed to neutrality and freeze-dried to obtain a starch nanocrystal yield of 26.7%. Characterization using atomic force microscopy, such as figure 1 shown. Image processing and statistical analysis were carried out to obtain a total of 81 starch nano...

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Abstract

The invention discloses a damp-heat treatment technology for obtaining starch nanocrystal from native starch. The native starch is subjected to damp-heat treatment under certain conditions, and the starch subjected to the damp-heat treatment is subjected to acid hydrolysis. By measuring parameters like the crystallinity of the substance obtained after the acid hydrolysis and micro morphology, compared with a common acid hydrolysis method, according to starch nanocrystal obtained according to the damp-heat treatment technology, the yield is greatly increased, the treatment time is also shortened, and the problem that starch nanocrystal cannot be produced in batches is expected to be further solved.

Description

technical field [0001] The invention relates to methods in the fields of starch processing, wet heat treatment and nanometer materials, in particular to a wet heat treatment process for obtaining starch nanocrystals from raw starch. Background technique [0002] There is a structure in which crystalline regions and non-crystalline regions are arranged alternately in the interior of starch granules, and the non-crystalline regions are loosely and irregularly arranged and have no resistance to acid. At present, regarding the composition of the crystalline region and the non-crystalline region, many scholars believe that the crystalline region is mainly composed of amylopectin, while the non-crystalline region is mainly composed of amylose. The use of acid can hydrolyze the non-crystalline regions of starch granules, while the crystalline regions are preserved in the form of starch nanocrystals. The size of starch nanocrystals is generally below 100nm, which has excellent prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B30/12C08B30/02
CPCC08B30/02C08B30/12
Inventor 成芳戴理民李长伟张俊
Owner ZHEJIANG UNIV
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