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Preparation method of edible nanofiber preservative film

A nanofiber and cling film technology, which is used in rot-proof containers, flexible coverings, textiles and paper making, etc., can solve the problems of uneven surface distribution of fruits and vegetables, inconsistent fresh-keeping effects of fruits and vegetables, and different film thicknesses, and achieve weight loss rate. Reduced, good preservation effect, uniform diameter distribution effect

Active Publication Date: 2017-07-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the spraying of liquid droplets, the surface of fruits and vegetables is unevenly distributed, and the thickness of the film formed on the surface is different, which makes the fresh-keeping effect of fruits and vegetables locally inconsistent.

Method used

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  • Preparation method of edible nanofiber preservative film
  • Preparation method of edible nanofiber preservative film
  • Preparation method of edible nanofiber preservative film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Prepare 95% ethanol solution at room temperature and set aside.

[0035] (2) Dissolving the pullulan in the ethanol solution in step (1) so that the mass concentration of the pullulan is 18%, and fully stirring until completely dissolved.

[0036] (3) Add carboxymethyl cellulose to make its mass concentration 1.5%, stir well until it dissolves completely, and obtain the basic spinning solution.

[0037] (4) Then in the basic spinning solution of step (3), add tea polyphenols and sodium citrate to make the mass concentration of the two be 1% and 0.5% respectively, stir evenly with a magnetic stirrer, and leave standstill until the bubbles are completely Disappeared, the spinning solution was obtained.

[0038](5) Draw the spinning solution obtained in step (4) with a syringe, place it on an electrospinning machine, and perform electrospinning. Among them, electrostatic voltage: 18kv; acceptance distance: 13-16cm; needle type: inner diameter 0.6mm, outer diameter 0....

Embodiment 2

[0057] (1) Prepare 95% ethanol solution at room temperature and set aside.

[0058] (2) Dissolving the pullulan in the ethanol solution in step (1) so that the mass concentration of the pullulan is 18%, fully stirring until completely dissolved.

[0059] (3) Add carboxymethyl cellulose to make its mass concentration 1%, stir well until it dissolves completely

[0060] (4) Then in the step (3) spinning solution, add tea polyphenols and sodium citrate to make the mass concentration of the two be 1% and 0.5% respectively, stir evenly with a magnetic stirrer, and leave standstill until the bubbles disappear completely.

[0061] (5) Draw the spinning solution with a syringe, place it on an electrostatic spinning machine, and perform electrostatic spinning. Among them, electrostatic voltage: 18kv; acceptance distance: 13-16cm; needle type: inner diameter 0.6mm, outer diameter 0.9mm; room temperature: 25°C; air humidity: 65%.

[0062] (6) Cut the obtained nanofiber film with a thic...

Embodiment 3

[0077] (1) Prepare 95% ethanol solution at room temperature and set aside.

[0078] (2) Dissolving the pullulan in the ethanol solution in step (1) so that the mass concentration of the pullulan is 18%, fully stirring until completely dissolved.

[0079] (3) Add carboxymethyl cellulose to make its mass concentration 2%, stir well until it dissolves completely

[0080] (4) Then in the step (3) spinning solution, add tea polyphenols and sodium citrate to make the mass concentration of the two be 1% and 0.5% respectively, stir evenly with a magnetic stirrer, and leave standstill until the bubbles disappear completely.

[0081] (5) Draw the spinning solution with a syringe, place it on an electrostatic spinning machine, and perform electrostatic spinning. Among them, electrostatic voltage: 18kv; acceptance distance: 13-16cm; needle type: inner diameter 0.6mm, outer diameter 0.9mm; room temperature: 25°C; air humidity: 65%.

[0082] (6) Cut the obtained nanofiber film with a thic...

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Abstract

The invention discloses a preparation method of an edible nanofiber preservative film. The preparation method comprises the following steps: (1) fully dissolving pullulan in ethyl alcohol with the volume fraction of 90%-95% at room temperature to enable the mass concentration of pullulan to be 16%-18%, and after fully dissolving pullulan, adding carboxymethyl cellulose to enable the mass concentration of the mixed solution to be 1%-2%, so as to obtain a basic spinning solution; (2) adding tea polyphenol and sodium citrate into the basic spinning solution to enable the mass concentrations of tea polyphenol and sodium citrate to be 0.5%-1% and 0.3%-0.5% respectively, fully stirring until uniformly dissolved, and leaving to stand until air bubbles completely disappear, so as to obtain a spinning solution; (3) placing the spinning solution on an electrostatic spinning machine for spinning, so as to obtain the edible nanofiber preservative film in the form of non-woven fabric. Compared with the coating method, the preparation method has the advantages that the prepared preservative film is good in the preservation effect, the raw material usage amount is small, and the prepared preservative film is lighter.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of food preservation, and in particular relates to a preparation method of an edible nanofiber preservation film. [0003] (2) Technical background [0004] With the enhancement of people's awareness of environmental protection and the improvement of food quality requirements, food packaging has gradually become a hot spot of concern, and the requirements for it are also increasing. At present, the widely used packaging materials are mostly made of high molecular polymers such as polyvinyl chloride, polypropylene, polystyrene, etc. These materials are not only difficult to degrade in nature, but also cause white pollution, and cause a lot of waste of resources. Therefore, the use of renewable resources to produce edible films has become a new trend. [0005] Edible Films are films that can be eaten, keep food fresh and have packaging protection functions. Due to the special long-chain helical molecular str...

Claims

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Application Information

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IPC IPC(8): B65D65/46B65D81/24D04H1/728D04H1/42
CPCB65D65/463B65D81/24D04H1/42D04H1/728
Inventor 邵平牛犇陈杭君孙培龙
Owner ZHEJIANG UNIV OF TECH
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