Gradient-slow-release type active composite film and preparing method thereof

A composite film, slow-release technology, applied in the direction of flexible covering, packaging item types, special packaging items, etc. Poor tolerance and other problems, to achieve the effects of excellent adhesion, inhibition of initial oxidative browning, suitable tensile strength and breaking strength

Active Publication Date: 2019-09-06
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, since water-soluble antioxidants are mainly loaded on the hydrophilic matrix, and fat-soluble antibacterial essential oils are mainly loaded on the hydrophobic matrix, the compatibility between the two is poor, and only a single type of antioxidant or antibacterial agent can be added alone In the edible film, it is difficult to achieve the best fresh-keeping effect of anti-oxidation and antibacterial at the same time, and the duration of anti-oxidation and antibacterial effects is short

Method used

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  • Gradient-slow-release type active composite film and preparing method thereof
  • Gradient-slow-release type active composite film and preparing method thereof
  • Gradient-slow-release type active composite film and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 Active Composite Membrane A

[0048] A gradient slow-release active composite film A, prepared by the following steps:

[0049] (1) Preparation of the anti-oxidative moisture-absorbing inner layer stock solution: Dissolve 8g of gelatin and 1.3g of tea polyphenols in 38mL of 80% acetic acid-water solution at 55°C, first fully stir for 0.5h under magnetic stirring conditions; then add 4g For zein, add 0.5g glycerin and fully stir for 2h under the condition of magnetic stirring;

[0050] (2) Preparation of gradient antibacterial and antioxidant intermediate layer stock solution: 4 g of gelatin and different mass fractions of tea polyphenols were dissolved in 20 mL of 80% acetic acid-water solution, 8 g of zein and different mass fractions of rosemary essential oil were dissolved In 18mL of 80% acetic acid-water solution (that is, the mass ratio of prolamin to water-soluble protein in the middle layer is 2:1), first fully stir under magnetic stirring condition...

Embodiment 2

[0053] Embodiment 2 Active Composite Membrane B

[0054] A gradient slow-release active composite membrane B is prepared by the following steps:

[0055] (1) Preparation of the anti-oxidative moisture-absorbing inner layer stock solution: Dissolve 8g of gelatin and 1.3g of tea polyphenols in 38mL of 80% acetic acid-water solution at 55°C, first fully stir for 0.5h under magnetic stirring conditions; then add 4g For zein, add 0.5g glycerin and fully stir for 2h under the condition of magnetic stirring;

[0056] (2) Preparation of gradient antibacterial and antioxidant intermediate layer stock solution: 6g of gelatin and different mass fractions of tea polyphenols were dissolved in 20mL of 80% acetic acid-water solution, 6g of zein and different mass fractions of rosemary essential oil were dissolved In 18mL of 80% acetic acid-water solution (that is, the mass ratio of prolamin to water-soluble protein in the middle layer is 1:1), first stir thoroughly under magnetic stirring c...

Embodiment 3

[0059] Example 3 active composite membrane C

[0060] A gradient slow-release active composite membrane C is prepared by the following steps:

[0061] (1) Preparation of the anti-oxidative moisture-absorbing inner layer stock solution: Dissolve 8g of gelatin and 1.3g of tea polyphenols in 38mL of 80% acetic acid-water solution at 55°C, first fully stir for 0.5h under magnetic stirring conditions; then add 4g For zein, add 0.5g glycerin and fully stir for 2h under the condition of magnetic stirring;

[0062] (2) Preparation of gradient antibacterial and antioxidant intermediate layer stock solution: Dissolve 8g gelatin and tea polyphenols with different mass fractions in 20mL80% acetic acid-water solution, dissolve 4g zein with different mass fractions of rosemary essential oil In 18mL of 80% acetic acid-water solution (i.e. the mass ratio of prolamin to water-soluble protein in the middle layer is 1:2), first fully stir under magnetic stirring conditions for 0.5h; then mix th...

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Abstract

The invention discloses a gradient-slow-release type active composite film and a preparing method thereof. The active composite film is composed of an anti-oxidation moisture absorption inner layer, at least one layer of gradient antibacterial anti-oxidation middle layer and at least one layer of waterproof outer layer from inside to outside. The anti-oxidation moisture absorption inner layer is prepared from an alcohol-soluble protein and water-soluble protein substrate and a water-soluble antioxidant. Each gradient antibacterial anti-oxidation middle layer is prepared from an alcohol-solubleprotein and water-soluble protein substrate, fat-soluble plant essential oil and a water-soluble antioxidant. The mass ratio of alcohol-soluble protein to water-soluble protein is (1-2):(1-2). Each waterproof outer layer is composed of a hydrophobic alcohol-soluble protein layer. The active composite film has long-acting anti-oxidation performance, long-acting antibacterial performance, one-way moisture resistance and good mechanical performance, can effectively improve the retention rate and long-acting performance of active matter, can effectively prevent fruits, vegetables, meat and otherfoods from water loss, oxidization and corrosion, and is high in film forming process continuation degree and short in production cycle, and the large-scale industrial production can be realized.

Description

technical field [0001] The invention belongs to the technical field of active packaging materials, and more specifically relates to a gradient slow-release active composite film and a preparation method thereof. Background technique [0002] With the increasing awareness of global environmental protection, edible packaging films with suitable moisture barrier properties, anti-oxidation and antibacterial activities are ushering in a research boom. Compared with other edible packaging films, protein-based films have good air permeability and mechanical properties, and can be used as carriers for active compounds, so they are favored in the field of food packaging. However, the protein-based edible films generally have the disadvantages of poor mechanical properties and poor water-blocking properties of water-soluble protein films. These deficiencies limit the application of protein films in food fresh-keeping packaging. [0003] Chinese patent document CN 108163369 A disclos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/02B32B9/04B65D65/40
CPCB32B9/00B32B9/02B32B9/04B65D65/40B65D65/463C08J7/042C08J2389/00C08J2489/00B32B2264/502B32B5/145B32B5/16B32B9/048B32B2264/06B32B2264/08B32B2264/12B32B2307/7145B32B2307/7265B32B2307/73B32B2439/70
Inventor 肖杰陈霞蔡济洋刘宏生王文博
Owner SOUTH CHINA AGRI UNIV
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