Preparation of cross-linked porous starch

Abstract

The invention discloses a preparation method of a cross-linked porous starch. The preparation comprises the following steps: taking soluble starch as the raw material, adding water-in-oil emulsion, and then carrying out one-step cross-linking reactions so as to prepare the cross-linked porous starch material. The preparation method takes N,N-methylene bisacrylamide as the cross-linking agent, carries out cross-linking reactions in emulsion, and obtains the cross-linked porous starch, which has the advantages of abundant hole structures on the starch surface, large specific surface area, improvement on the oil absorbing rate, and reduction in the crystallization degree. The specific surface area of the cross-linked porous starch is increased by 1.6 times than that of the porous starch prepared by the enzymatic hydrolysis method, the oil absorbing rate is increased by 1.5 times, and the maximum saturated adsorption capacity on dye methylene blue is increased by 4 times. The preparation method does not used pricy enzyme, reduces the production cost, and has a simple preparation technology. The preparation method can be applied to fields of food industry, medicine, or chemical engineering, and is especially suitable for being applied to the field of dye wastewater processing.

Description

technical field [0001] The invention relates to a preparation method of cross-linked porous starch. technical background [0002] Starch is a widely used natural polymer with the advantages of abundant sources, low price, non-toxicity, and biodegradability. Therefore, starch and modified starch have attracted people's attention in recent decades. Porous starch is a kind of modified starch, and a large number of micron-sized hollow pores are made on the surface of starch. These micropores increase the specific surface area of ​​starch, enhance the adsorption performance of starch, and expand its application range. In the food industry, porous starch can be used as an embedding agent for flavoring agents, sweeteners and other flavoring agents; in medicine, as a carrier of some drugs to achieve controlled release of these drugs; in the chemical industry, it can be used as a dye sewage treatment Adsorbents to purify sewage. [0003] At present, the commonly used preparation m...

AI Technical Summary

Problems solved by technology

In addition, after the starch granules make holes, the stable structure of the starch granules is destroyed; the enzymolysis reaction occurs in the amorphous region of the starch, and the crystallinity of the starch increases after enzymolysis. This highly crystalline porous starch has a fragile granule structure. It is easy to collapse during use, which seriously affects the application range

Therefore, it is imminent to develop a new method for preparing porous starch, and there is no report about the preparation technology of emulsion crosslinking method at present.

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