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Method for preparing instant starch film

A starch film and instant technology, applied in the field of food packaging film, can solve the problems of insufficient mechanical properties of starch film, rare starch edible film, and no edible film process, achieving less possibility of shrinkage and bursting, and making up for starch Increased yellowness and good transparency of paste

Active Publication Date: 2017-10-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been many studies on improving the solubility of starch films, the mechanical properties of starch films are not high enough, or complex and expensive processes such as debranching are required, or the addition of toxic substances such as propylene oxide limits its application in food.
Therefore, there is no mature process for preparing edible films in industry, and starch edible films used for packaging are rare in the market.

Method used

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  • Method for preparing instant starch film
  • Method for preparing instant starch film
  • Method for preparing instant starch film

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of preparation method of instant starch film, described preparation method comprises the steps:

[0031] (1) Carrying out electron beam irradiation treatment to waxy cornstarch;

[0032] Put the waxy cornstarch in a ziplock bag and seal it, spread it flat, with a thickness of 1cm, then put the ziplock bag on the conveyor belt of the electron beam irradiation production line with an irradiation dose of 6kGy, and each rotation is one irradiation. The electron beam is produced by a 5Mev industrial electron accelerator with a dose rate of 2KGy / s.

[0033] (2) 20g of waxy cornstarch processed through step (1) is mixed with water to make a starch emulsion with a concentration of 40%. Afterwards, the starch emulsion is placed in a 45°C constant temperature water bath, stirred at a speed of 300rpm for 30min, and then Add sodium hypochlorite solution (available chlorine content accounts for 2% of starch dry base), constantly detect the pH of the reaction solution during ...

Embodiment 2

[0037] A kind of preparation method of instant starch film, described preparation method comprises the steps:

[0038] (1) potato starch is carried out electron beam irradiation treatment;

[0039] Put the potato starch in a ziplock bag and seal it, spread it flat, with a thickness of 0.8cm, and then put the ziplock bag on the conveyor belt of the electron beam irradiation production line with an irradiation dose of 10kGy, and each rotation is one irradiation, electron The beam is produced by a 5 Mev industrial electron accelerator with a dose rate of 2KGy / s.

[0040] (2) Mix 20 g of potato starch processed in step (1) with water to make a starch emulsion with a concentration of 20%, then place the starch emulsion in a constant temperature water bath at 40°C, stir for 20 minutes at a speed of 500 rpm, and then add sodium hypochlorite solution (available chlorine content accounts for 2% of the starch dry base), constantly detect the pH of the reaction solution in the reaction ...

Embodiment 3

[0044] A kind of preparation method of instant starch film, described preparation method comprises the steps:

[0045] (1) Carrying out electron beam irradiation treatment to cornstarch;

[0046] Put the cornstarch in a ziplock bag and seal it, spread it flat, with a thickness of 0.5cm, and then place the ziplock bag on the conveyor belt of the electron beam irradiation production line with an irradiation dose of 2kGy. The beam is produced by a 5 Mev industrial electron accelerator with a dose rate of 2KGy / s.

[0047] (2) Mix 20 g of cornstarch treated in step (1) with water to make a starch emulsion with a concentration of 30%, then place the starch emulsion in a constant temperature water bath at 30°C, stir for 30 minutes at a speed of 400 rpm, and then add sodium hypochlorite solution (available chlorine content accounts for 2% of starch dry base), constantly detect the pH of the reaction solution in the reaction process, adjust the pH value of the reaction solution to 10 ...

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Abstract

The invention discloses a method for preparing an instant starch film. The preparation method comprises the following steps: (1) performing electron beam irradiation treatment on original starch; (2) mixing the starch treated in the step (1) with water to prepare starch emulsion, and adding a sodium hypochlorite solution to carry out an oxidation reaction so as to obtain oxidized and irradiated starch; (3) preparing the oxidized and irradiated starch with cold water so as to prepare starch suspension, and adding microcrystalline cellulose suspension so as to prepare gelatinized starch liquid; and (4) casting the gelatinized starch liquid in a flat-plate plastic case, drying in a constant temperature humidity chamber, realizing indoor temperature balancing, finally performing film uncovering, thereby obtaining the instant starch film. According to the method disclosed by the invention, the starch is modified through the electron beam irradiation and oxidation method. The method disclosed by the invention is easy to operate, safe and capable of effectively improving the mechanical property and solubility of the original starch film.

Description

technical field [0001] The invention relates to the technical field of food packaging films, in particular to a method for improving the performance of starch films by physically and chemically modifying starch and preparing instant starch films. Background technique [0002] Traditional plastic products are widely used in food packaging and fresh-keeping due to their cheap price and stable properties, but they are not easy to decompose and rot in the environment after use, causing serious "white pollution". The awareness is gradually increasing, and the research on degradable materials made of renewable resources such as natural polymers has attracted more and more attention. Due to its relatively stable performance, starch is suitable for long-term storage. In addition, it has a wide range of sources and is cheap. After drying, starch dilute solution after gelatinization can be made into starch film, which has a good development prospect in degradable film. [0003] Due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J3/28C08L3/10C08L1/04C08B31/18
Inventor 周星叶小嘉王园园鲍王璐王韧王金鹏田耀旗焦爱权赵建伟徐学明金征宇
Owner JIANGNAN UNIV
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