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Method for preparing starch films for inhibiting post-harvest fungi

A technology of starch film and fungus, which is applied in the fields of agriculture, biology and food. It can solve the problems of affecting transparency and darkening the color, and achieve the effect of easy film formation and bubble removal, low viscosity and good emulsification performance

Pending Publication Date: 2018-10-26
GANSU AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oxidized starch is sensitive to heat, and the color becomes darker when the temperature is high, which affects its transparency.
In addition, there are no reports of antibacterial starch films against postharvest fungi, so it is particularly important to develop an antibacterial starch film that is environmentally friendly, has high mechanical strength, and can inhibit postharvest fungi.

Method used

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  • Method for preparing starch films for inhibiting post-harvest fungi
  • Method for preparing starch films for inhibiting post-harvest fungi
  • Method for preparing starch films for inhibiting post-harvest fungi

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 A kind of starch film preparation method that suppresses postharvest fungus, comprises the following steps:

[0038] (1) Add distilled water 30 times the mass of microporous octenyl succinate cornstarch, and completely gelatinize it at 90°C to obtain gelatinized starch.

[0039] (2) Add 1% acetic acid solution with a volume concentration of 50 times its mass to chitosan, and dissolve it at 30°C to obtain a transparent solution.

[0040] Wherein: the amount of chitosan accounts for 51% of the quality of microporous octenyl succinate cornstarch.

[0041] (3) Cool the gelatinized starch and the transparent solution to room temperature and mix them uniformly to obtain a mixture. Add glycerin and cumin essential oil to the mixture, undergo homogeneous emulsification at a pressure of 20 MPa for 30 minutes, and debubble at a power of 120 W for 30 minutes to obtain a film liquid.

[0042] Wherein: the amount of glycerin added is 10% of the mass of the microporous ...

Embodiment 2

[0045] Embodiment 2 A kind of starch film preparation method that suppresses postharvest fungus, comprises the following steps:

[0046] (1) Add distilled water 100 times the mass of microporous octenyl succinate cornstarch, and completely gelatinize it at 90°C to obtain gelatinized starch.

[0047] ⑵Add 100 times its mass of acetic acid solution with a volume concentration of 2% to chitosan, dissolve it at 80°C to obtain a transparent solution.

[0048] Wherein: the consumption of chitosan accounts for 70% of the quality of microporous octenyl succinate cornstarch.

[0049] (3) Cool the gelatinized starch and the transparent solution to room temperature and mix them uniformly to obtain a mixture. Add glycerin and cumin essential oil to the mixture, undergo homogeneous emulsification at a pressure of 100 MPa for 60 minutes, and debubble at a power of 600W for 30 minutes to obtain a film liquid.

[0050] Wherein: the amount of glycerin added is 19% of the mass of the microporo...

Embodiment 3

[0053] Embodiment 3 A kind of starch film preparation method that suppresses postharvest fungus, comprises the following steps:

[0054] (1) Add distilled water 70 times its mass to octenyl succinate cornstarch, and completely gelatinize it at 90°C to obtain gelatinized starch.

[0055] (2) Add 10% acetic acid solution with a volume concentration of 88 times its mass to chitosan, and dissolve it at 60°C to obtain a transparent solution.

[0056] Wherein: the consumption of chitosan accounts for 30% of octenyl succinate cornstarch quality.

[0057] (3) Cool the gelatinized starch and the transparent solution to room temperature and mix them uniformly to obtain a mixture. Add glycerin and essential oils to the mixture, undergo homogeneous emulsification at a pressure of 80 MPa for 40 minutes, and debubble at a power of 200 W for 20 minutes to obtain a film liquid.

[0058] Wherein: the addition amount of glycerin is 20% of the mass of octenyl succinate corn starch; the addition...

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Abstract

The invention relates to a method for preparing starch films for inhibiting post-harvest fungi. The method includes steps of (1), adding distilled water into starch and completely gelatinizing the starch at the temperatures of 90 DEG C to obtain gelatinized starch; (2), adding acetic acid solution into chitosan and dissolving the chitosan in the acetic acid solution to obtain transparent solution;(3), cooling the gelatinized starch and the transparent solution until the temperatures of the gelatinized starch and the transparent solution reach the room temperature, then uniformly mixing the gelatinized starch and the transparent solution with each other to obtain mixtures, adding glycerin and essential oil into the mixtures, homogenizing and emulsifying the mixtures with the glycerin and the essential oil and ultrasonically removing bubble to obtain film liquid; (4), carrying out tape casting on the film liquid onto polytetrafluoroethylene flat plates and drying the film liquid to obtain uniform thin films; (5), placing the thin films in artificial climate boxes, balancing the thin films, then packaging the thin films and conserving the thin films in refrigerators at the temperatures of 4 DEG C to obtain the starch films. The method has the advantages that the method is easy to operate, and excellent effects of inhibiting the post-harvest fungi can be realized by the starch films prepared by the aid of the method; the problems of poor mechanical strength and high water vapor permeability of existing starch films can be solved, and the method is high in efficiency and applicable to industrialization and is environmentally friendly.

Description

technical field [0001] The invention relates to the technical fields of agriculture, biology and food, in particular to a starch film preparation method for inhibiting postharvest fungi. Background technique [0002] Prolonging fruit shelf life and protecting fruit quality is a long-term task of postharvest biology. For a long time, fruit packaging materials have mainly been plastic films, including biaxially oriented polypropylene film (BOPP), low-density polyethylene film (LDPE), nylon film (PA), etc., but these films generally have poor biodegradability , easy to cause "white pollution". The preparation of edible packaging films with biodegradable materials as the matrix to replace the current plastic films has become a current research hotspot. Among them, starch film has attracted attention due to its low price, but its application has been limited due to its weak strength and high water vapor permeability. In order to overcome its shortcomings and improve its functi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L3/06C08L5/08C08L91/00C08K5/053C08J5/18C08B30/18
CPCC08B30/18C08J5/18C08J2303/02C08J2303/06C08J2405/08C08J2491/00C08K5/053
Inventor 龙海涛薛华丽蒲陆梅毕阳南米娜付国瑞许卫兵杜明远
Owner GANSU AGRI UNIV
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