Method for modifying starch by enzyme degradation process

Abstract

The invention discloses a method for modifying starch by an enzyme degradation process. The method specifically comprises the following steps: preparing starch milk from the starch and water, and regulating the starch milk to be alkaline with a sodium hydroxide solution; adding sodium hypochlorite, carrying out a reaction with stirring, and controlling the pH value of the starch milk to be 8 to 9; cooling the starch milk to room temperature, then, adding a sodium lauryl sulfate solution, and carrying out uniform dissolving; adding vinyl acetate, and carrying out a reaction with stirring; adding polyvinyl alcohol into the obtained starch milk, and continuing to carry out a reaction; adding 600U / g to 1,000U / g amylase, carrying out treatment for 4 to 8 hours at the temperature of 45 DEG C to 55 DEG C, then, rinsing the reaction solution, collecting solids, and carrying out vacuum drying, thereby obtaining the modified starch. According to the method, leptosomatic starch molecules are converted to pyknic starch branched structures with tighter structures by using starch branching enzyme, so that the rate of retrogradation of amylopectin is lowered, the aim of inhibiting starch retrogradation is achieved, and the produced starch has the characteristics of good hydrophobicity and fluidity and can be extensively applied to chemicals for daily use.

Description

technical field [0001] The invention relates to a method for modifying starch, in particular to a method for modifying starch by an enzyme degradation process. Background technique [0002] Starch is the storage carbohydrate with the largest proportion in grain grains. It is a kind of polysaccharide. Starch is a kind of raw material whose molecular structure can be degraded and has thermoplastic properties. Is the use of modified starch. Native starch undergoes appropriate chemical treatment to introduce certain chemical groups to change the molecular structure or its physical and chemical properties, thus producing modified starch. [0003] Porous starch is a kind of modified starch, and its porosity produces a large specific surface area, so porous starch is mainly used as a carrier for adsorption. Compared with other adsorbents, porous starch not only has good adsorption performance, but also has the characteristics of biodegradability, simple production process, and wi...

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Problems solved by technology

[0004] At present, there are mainly the following methods to modify native starch to prepare porous starch: one is physical method, such as ultrasonic irradiation or spraying process; the other is mechanical method, such as mechanical impact such as ball milling process; the third is biochemical method. Methods, such as alcohol denaturation or acid hydrolysis, in the above several methods, the production cost of mechanical impact methods such as ultrasonic irradiation and ball milling process is relatively high, and it is difficult to realize industrialization; and what is formed by spray method and alcohol denaturation is a solid Terpolymer spheres, the adsorption only occurs in the uneven grooves on the surface of the spheres, the adsorption capacity is relatively limited, and the application prospect is not optimistic; the reaction rate of the acid hydrolysis method is slow at the gelatinization temperature, the degradation is uneven, the randomness is strong, and it is not easy Porous formation limits the application of the acid method