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Preparation method of one-way water-blocking self-cleaning chitosan-zein double-layer film

A technology of zein and chitosan, applied in the directions of transportation and packaging, packaging, wrapping paper, etc., can solve the problems of low functional properties of chitosan film, easy to be stained with stains, etc. Strong operability and the effect of improving moisture barrier ability

Pending Publication Date: 2022-07-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure chitosan membranes are difficult to resist moisture penetration from the external environment, are prone to stains during application, provide favorable conditions for the growth of microorganisms, and have low functional properties of chitosan membranes.

Method used

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  • Preparation method of one-way water-blocking self-cleaning chitosan-zein double-layer film
  • Preparation method of one-way water-blocking self-cleaning chitosan-zein double-layer film
  • Preparation method of one-way water-blocking self-cleaning chitosan-zein double-layer film

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Experimental program
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Effect test

preparation example Construction

[0062] The preparation method of nanoparticles in the present invention:

[0063] Pectin, nisin and curcumin were dissolved in pure water, acetic acid solution with pH 4.0 and absolute ethanol, respectively, to prepare pectin solution (1mg / mL) and nisin solution (3mg / mL), respectively. ) and curcumin solution (3mg / mL);

[0064] Then the nisin solution is added dropwise to the pectin solution, and a composite solution is obtained after stirring;

[0065] Subsequently, the curcumin solution was added dropwise to the composite solution to prepare a mixed liquid system. In the mixed liquid system, the concentrations of the pectin, nisin and curcumin solutions were 1 mg / mL, 6 mg / mL and 4 mg / mL, respectively, with stirring Then, the nanoparticles were obtained by centrifugation and lyophilization.

Embodiment 1

[0067] (1) Dissolve chitosan in 1% (v / v) acetic acid solution to make a solution with a mass concentration of 2g / 100mL, and add 1% nanoparticles based on the mass of chitosan to the chitosan solution at 55°C and 25% glycerol, then stirred for 1 hour and then ultrasonically degassed for 15 minutes to obtain a chitosan-nanoparticle active layer coating solution;

[0068] (2) Pour the active layer coating liquid prepared in the first step into a leveled mold, and form a gel at 40°C;

[0069] (3) dissolve zein in 90% (v / v) ethanol solution to make a solution with mass concentration of 10g / 100mL, add 25% glycerin based on zein mass in the zein solution, stir After 2 hours, ultrasonic degassing was carried out for 20 minutes to obtain zein moisture-proof and self-cleaning layer coating liquid.

[0070] (4) Pour the zein moisture-proof and self-cleaning layer coating liquid prepared in the third step onto the chitosan-nanoparticle gel formed in the second step, and then put it in an...

Embodiment 2

[0072] (1) Dissolve chitosan in 1% (v / v) acetic acid solution to make a solution with a mass concentration of 2 g / 100 mL, and add 2% nanoparticles based on the mass of chitosan to the chitosan solution at 55°C and 25% glycerol, then stirred for 1 hour and then ultrasonically degassed for 15 minutes to obtain a chitosan-nanoparticle active layer coating solution;

[0073] (2) Pour the active layer coating liquid prepared in the first step into a leveled mold, and form a gel at 40°C;

[0074] (3) dissolve zein in 90% (v / v) ethanol solution to make a solution with mass concentration of 10g / 100mL, add 25% glycerin based on zein mass in the zein solution, stir After 2 hours, ultrasonic degassing was carried out for 20 minutes to obtain zein moisture-proof and self-cleaning layer coating liquid.

[0075] (4) Pour the zein moisture-proof and self-cleaning layer coating liquid prepared in the third step onto the chitosan-nanoparticle gel formed in the second step, and then put it in ...

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Abstract

The invention discloses a preparation method of a one-way water-blocking self-cleaning chitosan zein double-layer membrane, which comprises the following steps: firstly, dissolving chitosan in acetic acid to prepare a chitosan solution, then adding nanoparticles co-embedding curcumin and nisin and a plasticizer glycerol under a certain temperature condition, and uniformly stirring to obtain the one-way water-blocking self-cleaning chitosan zein double-layer membrane. Performing stirring and ultrasonic degassing to obtain an active layer coating liquid; the active layer coating liquid is poured into a leveled mold, and gel is formed at a certain temperature; dissolving zein in ethanol to prepare a zein solution, adding a plasticizer glycerol, stirring, and carrying out ultrasonic degassing to obtain a moisture-proof and self-cleaning layer coating liquid; and finally, uniformly spreading the moisture-proof and self-cleaning layer coating liquid on the surface of the gel, and drying at a certain temperature to form a double-layer film. According to the invention, zein is creatively used as a moisture-proof and self-cleaning layer, and nanoparticles with excellent antioxidant and antibacterial activity are added into a lower layer matrix of the double-layer membrane as an active layer, so that the biological activity and the service life of the chitosan membrane are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of green food packaging, and in particular relates to a preparation method of a self-cleaning chitosan zein bilayer film with unidirectional water blocking. Background technique [0002] Petroleum-based synthetic polymers are widely used as packaging materials. However, the use of synthetic petroleum-based products has raised health and environmental concerns and people are looking for suitable alternatives. Biodegradable natural polymers are being extensively studied. Among different biodegradable polymers, chitosan stands out for its excellent film-forming properties and unique physicochemical properties such as strong barrier ability and mechanical properties. However, pure chitosan films are difficult to resist the penetration of water in the external environment, are easily stained during application, provide favorable conditions for the growth of microorganisms, and have low functional properties of ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08C08L89/00C08L5/06C08K5/132B65D65/40
CPCC08J5/18B65D65/40C08J2389/00C08J2305/08C08J2405/06C08K5/132Y02W90/10
Inventor 余达威张利铭董俊丽夏文水姜启兴许艳顺
Owner JIANGNAN UNIV
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