Process for preparing nano-starch powder

Abstract

The invention provides a process for preparing nanometer fecula powder body material, the process comprises first, adding technical-grade cornstarch in deionized water which contains a certain amount of dispersing agent to prepare homogeneous dispersion solution whose density is 5% to 15% (starch quality percentage), second, adopting high-energy ultrasonic wave to intermittently deal the solutionfor 3-5 hours under the condition of guaranteeing the system temperature which is not lower than 50 DEG C, third, placing the solution in a 40 DEG C to 50 DEG C water bath vessel to stir with a stirrer, and slowly adding acid into the solution till the density in the acid is 5% to 10% to react in constant temperature for one hour, fourth, pumping and filtering the solution which is reacted, and washing products with NaOH dilute solution to neutral, respectively washing with deionized water and absolute ethyl alcohol for several times, finally, abrading the samples in 60DEG C to 80 DEG C for 2-4 hours to get nanometer starch products. All the raw material of the process is sold in markets, raw material is wide, the reaction process can be controlled, reproduction quality is excellent, and production cost is low. The nanometer starch starches which are prepared by the invention takes ball shape, the size of the starch diameter is evenly distributed, and the major function group of original starch is not changed, and the starch is not polluted and can be used as carriers of biological medicine or food additives, thereby the invention has wide application prospect.

Description

technical field [0001] The invention relates to a new method for preparing nano-starch powder by combining ultrasonic high-energy radiation and acid hydrolysis, and belongs to the field of nano-materials and nano-technology. Background technique [0002] Starch is a polysaccharide macromolecular compound composed of glucose, which has two structures of branched chain and straight chain. It is widely found in seeds, tubers, and fruits of plants. It is a non-toxic, biodegradable, and resource-rich green product. As the particle size decreases, the specific surface area of ​​starch granules increases, so it has obvious surface effects, which enhances the physical and chemical properties of starch such as adsorption, coagulation, and chemical activity. It can be used as an adsorption carrier for pharmaceuticals, pigments, spices, and pesticides. As an embedding agent, it is widely used in medicine, pesticide, daily chemical, food, textile, paper, metallurgy and petroleum industr...

AI Technical Summary

Problems solved by technology

Due to the inherent molecular structure characteristics of starch, there are certain limitations when using the above single methods for micronization treatment.

For example, when using physical methods to prepare fine starch, there is a crushing limit for starch granules. When the granules are fine enough to a certain extent, despite the action of mechanical energy such as shear force, the particle size will no longer continue to decrease with the increase of energy, and Long cycle, large particle size, and uneven particles; if acid, alkali or biological enzymes are used for hydrolysis, because the hydrolysis rate is uneven and the process is difficult to control, the product is hydrolyzed into dextrin, maltose or finally glucose, and the product yield is low; In the reverse microemulsion method, toxic substances such as toluene, chloroform or phosphorus oxychloride are often used in the experiment, which pollutes the biological characteristics of the original starch, and the particle size distribution is uneven

[0004] And take industrial starch as raw material, adopt the method for the combination of ultrasonic high-energy radiation and acid hydrolysis to prepare nano-starch powder, there is no report yet

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