Preparation method of high-solubility waxy maize starch film

Abstract

The invention discloses a preparation method of a high-solubility waxy maize starch film. The preparation method comprises the following steps: dispersing waxy maize starch into water; carrying out pre-gelatinization to completely gelatinize the starch and then cooling; adding isoamylase and completely debranching; concentrating, freezing and drying to obtain debranched waxy maize starch (DWMS); mixing the DWMS with the waxy maize starch and drying under certain humidity to form a film, so as to prepare the starch film with high mechanical strength and solubility and good heat sealing property and barrier property; the problems that the mechanical property of the waxy maize starch film is relatively weak and the solubility of a starch film with high content of amylose is poor can be solved at the same time. Moreover, in a production process, all used reagents are food-grade reagents so that the high-solubility waxy maize starch film can be used as a good edible food packaging film and is used for packaging instant foods including instant noodle seasonings or instant coffee and the like.

Description

technical field [0001] The invention relates to the technical field of food packaging films, in particular to improving the performance of the waxy cornstarch film by adding debranched waxy cornstarch (DWMS) and a method for preparing the highly soluble waxy cornstarch film. Background technique [0002] With the increasingly prominent environmental problems in today's society and the gradual enhancement of people's awareness of environmental protection, the research on degradable materials using renewable resources such as natural polymers as raw materials has attracted more and more attention. Starch has a wide range of sources, is cheap, and is renewable. The gelatinized starch dilute solution can be dried to form a starch film; and the starch film has low air permeability and good oil resistance, and has become the most promising category of degradable films. It has high application potential. [0003] Starch is divided into amylose and amylopectin. Among them, amylose ...

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Problems solved by technology

[0003] Starch is divided into amylose and amylopectin. Among them, amylose has a linear structure, and it is easy to interact between molecules and form a film. The film formed has a large degree of crystallinity and high tensile strength, but its solubility is poor; amylopectin is highly branched. , the steric hindrance is large, it is not easy to form a film, and it can only be slowly dried at a low temperature to form a film. The formed film is an amorphous structure with a large elongation at break and good solubility, but the tensile strength is low and the film-forming time is long.

Based on the related characteristics of the above two starches, when preparing starch films, people often first consider choosing starch with higher amylose content. However, this kind of starch is generally expensive, which greatly increases the production cost; or take some A method to increase the amylose content in the raw material, but when the amylose chain length is long and the amylose ratio is high, the solubility of the starch film will be seriously affected, which limits the application of the starch film

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