WO2022027604A1

WO2022027604A1 - Edible starch-based biodegradable film and preparation method therefor

Info

Publication number: WO2022027604A1
Application number: PCT/CN2020/107848
Authority: WO
Inventors: 陈昌平
Original assignee: 南京五瑞生物降解新材料研究院有限公司
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2022-02-10
Also published as: AU2020227120A1

Abstract

Provided are an edible starch-based biodegradable film and a preparation method therefor. The edible starch-based biodegradable film is prepared from the following raw materials by weight: 100 parts of plant starch, 30-40 parts of soluble dietary fibers, 8-12 parts of β-cyclodextrin, 10-25 parts of a plasticizer, 5-10 parts of sodium alginate and 2-5 parts of amylase. After starch is slightly hydrolyzed, the plasticizer is added to improve the film-forming property of the starch, the sodium alginate can enable the slightly hydrolyzed starch to generate a cross-linking effect with the dietary fibers and β-cyclodextrin to form a net-shaped structure, and the mechanical property and the waterproof property of the film are improved. The used raw materials are all edible materials, and the prepared film is edible, good in food preservation effect, easy to degrade under natural conditions, low in cost and capable of being used for edible packaging.

Description

Edible starch-based biodegradable film and preparation method thereof

technical field

The invention relates to an edible starch-based biodegradable film and a preparation method thereof, belonging to the field of degradable plastics.

Background technique

Edible biodegradable film is a new type of packaging material that can not only keep fresh, but also edible. It is non-polluting and degradable. It plays an important role in alleviating "white pollution" and has a good development prospect.

Single-component edible biodegradable films, such as starch films, have been unable to meet the packaging needs of various foods due to their poor mechanical properties, poor processability, and easy breakage. The edible biodegradable film of the composite material can effectively improve the performance of the edible biodegradable film through the complementation between materials, so that it can be applied to a wider range.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an edible starch-based biodegradable film with good mechanical properties and preservation effect.

The object of the present invention is achieved through the following technical solutions:

An edible starch-based biodegradable film is prepared from the following raw materials by weight:

Preferably, the starch is corn starch, sweet potato starch, pea starch or mung bean starch.

Preferably, the plasticizer is glycerol.

Preferably, the soluble dietary fiber is konjac flour, inulin or fructooligosaccharide.

The invention also discloses the preparation method of the above-mentioned edible starch-based biodegradable film, the steps of which include:

(1), by every 100g starch: the ratio of 600-1200g water, add water in the vegetable starch, heat up while stirring, under 65-85 ℃ of conditions, stir again 1-5h, obtain pasty solution;

(2), cooling the paste solution of step (1) to 30-40 ℃, adding amylase, stirring reaction for 0.5-2h;

(3), adding the remaining auxiliary materials, stirring until the solution is mixed evenly, and using the casting method to form a film to obtain an edible starch-based biodegradable film.

Preferably, before the film is formed by the casting method, the uniformly stirred solution is degassed for more than 2 hours under a vacuum condition of less than 0.1 MPa.

In the present invention, after the starch is mildly hydrolyzed, a plasticizer is added to increase its film-forming property, and sodium alginate can make the mildly hydrolyzed starch, dietary fiber and β-cyclodextrin have a cross-linking effect, form a network structure, and improve the Mechanical properties and waterproofing properties of films. The raw materials used in the invention are all edible materials, and the prepared film is edible, has good fresh-keeping effect on food, is easy to degrade under natural conditions, has low cost, and can be widely used in edible packaging.

detailed description

Example 1

The preparation method of the edible starch-based biodegradable film includes the following steps:

(1), add 1000 parts of water to 100 parts of vegetable starch, heat up while stirring, and stir at 75 ° C for another 2 hours to obtain a paste solution;

(2), cooling the paste solution of step (1) to 36 ℃, adding amylase, stirring and reacting for 1h;

(3), adding 35 parts of soluble dietary fiber, 10 parts of beta-cyclodextrin, 20 parts of glycerol, 8 parts of sodium alginate, and 3 parts of amylase. , stir until the solution is mixed evenly, degas the solution for more than 2h under vacuum conditions below 0.1MPa, and use the casting method to form a film with a film thickness of 0.05mm to obtain an edible starch-based biodegradable film.

Example 2

(1), add 600 parts of water to 100 parts of vegetable starch, heat up while stirring, and stir for another 0.5h at 85°C to obtain a paste solution;

(2), cooling the paste solution of step (1) to 30 ℃, adding amylase, stirring and reacting for 2h;

(3), add 30 parts of soluble dietary fiber, 8 parts of β-cyclodextrin, 10 parts of plasticizer, 5 parts of sodium alginate, 5 parts of amylase, stir until the solution is mixed evenly, and the solution is below 0.1MPa The film was degassed for more than 2 hours under the vacuum condition of 1000000000000000000000000000000000000-1000000000000000 1000000 1000000000000000000000000 and 100005% thickness by casting method, and the film thickness was 0.05 mm, to obtain an edible starch-based biodegradable film.

Example 3

(1), add 1200 parts of water to 100 parts of vegetable starch, heat up while stirring, and stir at 65 ° C for another 5h to obtain a paste solution;

(2), cooling the paste solution of step (1) to 40 ℃, adding amylase, stirring reaction for 0.5h;

(3), add 40 parts of soluble dietary fiber, 12 parts of β-cyclodextrin, 25 parts of plasticizer, 10 parts of sodium alginate, 2 parts of amylase, stir until the solution is mixed evenly, and the solution is below 0.1MPa The film was degassed for more than 2 hours under the vacuum condition of 1000000000000000000000000000000000000-1000000000000000 1000000 1000000000000000000000000 and 100005% thickness by casting method, and the film thickness was 0.05 mm, to obtain an edible starch-based biodegradable film.

The fruits or vegetables are placed in the fresh-keeping bags made of the edible starch-based biodegradable films of Examples 1-3, and stored in a container at 0-5° C., and the fresh-keeping time is more than 42 days.

Claims

An edible starch-based biodegradable film is prepared from the following raw materials by weight:
The edible starch-based biodegradable film according to claim 1, wherein the starch is corn starch, sweet potato starch, pea starch or mung bean starch.
The edible starch-based biodegradable film according to claim 2, wherein the plasticizer is glycerol.
The edible starch-based biodegradable film according to claim 3, wherein the soluble dietary fiber is konjac flour, inulin or fructooligosaccharide.
The preparation method of the edible starch-based biodegradable film according to any one of claims 1-4, the steps comprising:

(1), according to the ratio of 600-1200g of water per 100g of starch, add water to the plant starch, heat up while stirring, and then stir at 65-85 ° C for 1-5h to obtain a paste solution;

(2), cooling the paste solution of step (1) to 30-40 ℃, adding amylase, stirring reaction for 0.5-2h;

(3), adding the remaining auxiliary materials, stirring until the solution is mixed evenly, and using the casting method to form a film to obtain an edible starch-based biodegradable film.
The method for edible starch-based biodegradable film according to claim 5, wherein the uniformly stirred solution is degassed for more than 2 hours under a vacuum of less than 0.1 MPa before film-making by the casting method.