Preparation method of highly hydrophobic edible membrane

An edible film and hydrophobic technology, applied in flexible coverings, packaging, layered products, etc., can solve problems such as difficult absorption or degradation, food impact, poor biocompatibility, etc., and achieve the effect of simple method and broad application prospects

Active Publication Date: 2014-12-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the poor biocompatibility of general hydrophobic packaging materials, it is difficult to be absorbed or degraded by the human body. Research and development of non-toxic and edible hydrophobic films has become a hot spot in recent years.
[0004] In recent years, due to its self-assembly properties, zein has been widely studied in particle embedding active substances and the stability of Pickering emulsion; in the preparation of film materials, plasticizers can be directly added to prepare single-layer edible film materials, Affected by the chemical properties of zein, its single-layer film has insufficient mechanical properties to meet the needs of general packaging films. Therefore, it needs to be used with other film-forming substrates to prepare multi-layer or hybrid film materials, such as through reflection. Solvent evaporation method is used to prepare zein particles. At the same time, active substances such as antibacterial agents are embedded and evenly mixed with film substrates such as Benqin, carrageenan, and chitosan to prepare granular film materials or controllable release active substances; due to the film composition and Influenced by the structure, the surface wettability of these zein film materials is poor, so the external water droplets are easy to stay on the surface of the film, thus affecting the packaged food.
[0005] In 2014, Ye-Chong Yin et al. (Ye-Chong Yin a, Shou-Wei Yin a, Xiao-Quan Yang. Surface modification of sodium caseinate films by zein coatings. Food Hydrocolloids[J], 2014(36): 1- 8.) Use zein to instantly reduce the ethanol concentration by washing to form a large particle modified sodium complexate film, and prepare a sodium complexate film-zein double-layer film material, and its contact angle is increased from 24° to 73°, the wettability performance is greatly improved, but it is in a hydrophilic state, and water droplets are easy to stay on the surface of the film

Method used

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  • Preparation method of highly hydrophobic edible membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In the first step, defatted chitosan is prepared into acetic acid aqueous solution, the concentration of acetic acid is 1%, and the concentration of chitosan is 1%. After fully hydrating, it is evenly drip-coated on a glass plate, and placed in a constant temperature and humidity box to dry. Drying is to place the material in a constant temperature and humidity box, the temperature of the constant temperature and humidity box is 25° C., and the relative humidity is 40%.

[0052] The second step prepares the ethanol aqueous solution that ethanol mass content is 80%, will be equivalent to the zein protein of ethanol aqueous solution quality 5% to add wherein, after fully dissolving, obtain zein solution, will be relative to the first step chitosan The 100% zein solution of the volume of the solution is evenly drip-coated on the glass plate obtained in the first step, and after 60s, use deionized water equivalent to 200% of the chitosan solution volume in the first step, an...

Embodiment 2

[0058] In the first step, defatted chitosan is prepared into acetic acid aqueous solution, the concentration of acetic acid is 1%, and the concentration of chitosan is 1%. After fully hydrating, it is evenly drip-coated on a glass plate, and placed in a constant temperature and humidity box to dry. Drying is to place the material in a constant temperature and humidity box, the temperature of the constant temperature and humidity box is 25° C., and the relative humidity is 40%.

[0059] The second step prepares 80% ethanol-water solution, adds wherein the zein protein that is equivalent to 5% of solution, after fully dissolving, obtains zein protein solution, will be 100% with respect to the chitosan solution volume of the first step % zein solution is evenly drip-coated on the glass plate obtained in the first step, and after 60s, use deionized water equivalent to 200% of the chitosan solution volume in the first step, the plate is inclined at 45 °, and the water flows from Th...

Embodiment 3

[0066] In the first step, defatted chitosan is prepared into acetic acid aqueous solution, the concentration of acetic acid is 1%, and the concentration of chitosan is 1%. After fully hydrating, it is evenly drip-coated on a glass plate, and placed in a constant temperature and humidity box to dry. Drying is to place the material in a constant temperature and humidity box, the temperature of the constant temperature and humidity box is 25° C., and the relative humidity is 40%.

[0067] The second step is to prepare 90% ethanol-water solution, add zein protein equivalent to 1% of the solution, and after fully dissolving, apply the amount of 100% of the chitosan solution volume in the first step evenly on the On the glass plate obtained in the first step, after 0s, use deionized water equivalent to 200% of the volume of the chitosan solution in the first step, the plate is inclined at 45°, and the water is dripped from the upper part of the plate to the lower part, and the washin...

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Abstract

The invention relates to a preparation method of a highly hydrophobic edible membrane. The method comprises the following steps: adding degreased chitosan into an aqueous acetic acid solution, fully hydrating to obtain an aqueous chitosan acetic acid solution, evenly dispensing the aqueous chitosan acetic acid solution to a glass plate, and drying; preparing an ethanol aqueous solution containing 50%-95% by mass of ethanol, and adding prolamine to obtain a prolamine solution; evenly dispensing the prolamine solution to the treated glass plate, dropwise washing the glass plate with pure water, and drying; preparing an ethanol aqueous solution containing 70%-90% by mass of the ethanol, adding prolamine to obtain a prolamine solution; and evenly dispensing to the treated glass plate, and drying. The edible membrane material can be used for overcoming the defect that the polysaccharide or protein membrane material is poor in waterproof property, and the time of water drops staying on the surface of the membrane during transportation can be shortened, so that the content of water penetrating through a packaging membrane can be reduced, the water activity of food can be guaranteed, and the growth of microorganisms can be inhibited.

Description

technical field [0001] The invention relates to an edible film material, in particular to a preparation method of a highly hydrophobic edible film. technical background [0002] Food will inevitably be attacked by rainwater during circulation and transportation. Therefore, food packaging needs to have waterproof ability. The application of hydrophobic materials on the outer surface of packaging can greatly improve the waterproof ability, because hydrophobic water materials have strong anti-corrosion and anti-oxidation properties. ability, so the service life of the packaging container can be extended; in addition, many foods are easy to deteriorate after being exposed to moisture, so it is necessary to use better moisture-proof materials. Building a super-hydrophobic surface on the outer surface of the moisture-proof material can make the packaging material have better moisture-proof ability. It also has good waterproof ability, so as to improve the moisture-proof effect, ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/02B32B9/06B65D65/46B65D65/40
Inventor 尹寿伟石伟健唐传核杨晓泉
Owner SOUTH CHINA UNIV OF TECH
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