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Preparation method and application of gelatin-chitosan composite membrane

A technology of chitosan and composite film, which is applied in the direction of flexible coverings, packaging, wrapping paper, etc., can solve the problems of chitosan easy to form agglomerates, low production efficiency, and long time, and achieve antibacterial and fresh-keeping effects and improve efficiency , the effect of significant effect

Inactive Publication Date: 2015-10-28
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan cannot be directly dissolved in water. Usually, a certain amount of chitosan is added into the acetic acid solution and fully stirred to dissolve it. This dissolution method takes a long time, and the production efficiency is low in practical applications, and chitosan is easy to form. After chitosan was added into dilute acetic acid solution and stirred for 60 minutes, the solution was still opaque. After stirring for 70 minutes, the solution was transparent, but a small amount of undissolved chitosan stuck to the stirring head. After stirring for 110 minutes, the stirring head The chitosan adhering to the surface was still not completely dissolved, and the chitosan was completely dissolved after stirring for 150 min.

Method used

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  • Preparation method and application of gelatin-chitosan composite membrane
  • Preparation method and application of gelatin-chitosan composite membrane
  • Preparation method and application of gelatin-chitosan composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of gelatin-chitosan composite film, the steps are as follows:

[0025] (1) At room temperature, add 2.0g of chitosan into a three-neck flask, add 98mL of deionized water and stir for 3 minutes to disperse the chitosan evenly, then add 2mL of phosphoric acid solution dropwise while stirring, adjust the pH to 3.5, and continue to stir fully , to obtain a 2% (w / v) chitosan solution;

[0026] (2) Mix 10 mL of gelatin solution with a concentration of 20% (w / v) with the chitosan solution prepared in step (1), the mass ratio of gelatin to chitosan is 1:1, and stir at 40°C Make the mixture evenly to obtain the gelatin / chitosan mixed solution, add 0.4g PEG 200 into the gelatin / chitosan mixed solution, stir under the condition of 40°C to make the mixed evenly, and then neutralize it with a NaOH solution with a concentration of 1mol / L to pH is 6;

[0027] (3) Add 0.004g of transglutaminase (TGase) to the reaction product of step (2), continue to stir at 40°C...

Embodiment 2

[0029] A preparation method of gelatin-chitosan composite film, the steps are as follows:

[0030] (1) At room temperature, add 4g of chitosan into a three-necked flask, add 99mL of deionized water and stir for 5 minutes to disperse the chitosan evenly, then add 1mL of formic acid solution dropwise while stirring, adjust the pH to 6, and continue to stir fully. A chitosan solution with a concentration of 4% (w / v) was obtained;

[0031] (2) Mix 80 mL of gelatin solution with a concentration of 5% (w / v) with the chitosan solution prepared in step (1), the mass ratio of gelatin to chitosan is 1:1, stir at 60°C Mix well to get a gelatin / chitosan mixed solution, add 2.4g PEG 200 to the gelatin / chitosan mixed solution, stir at 60°C to make the mixture evenly, at this time, the pH is above 6, close to 6.5, no need to adjust again pH;

[0032] (3) Add 0.04g of transglutaminase (TGase) to the reaction product of step (2), continue to stir at 60°C for 35 minutes, heat up to boiling to...

Embodiment 3

[0034] A preparation method of gelatin-chitosan composite film, the steps are as follows:

[0035] (1) At room temperature, add 3.5g of chitosan into a three-neck flask, add 98mL of deionized water and stir for 4 minutes to disperse the chitosan evenly, then add 2mL of nitric acid solution dropwise while stirring, adjust the pH to 4, and continue to stir fully , to obtain a chitosan solution with a concentration of 3.5% (w / v);

[0036] (2) Mix 50 mL of 7% (w / v) gelatin solution with the chitosan solution prepared in step (1), the mass ratio of gelatin to chitosan is 1:1, and stir at 50°C Make the mixture uniform to obtain a gelatin / chitosan mixed solution, add 1.75g ​​PEG 200 into the gelatin / chitosan mixed solution, stir at 50°C to make the mixture uniform, and then neutralize it with a NaOH solution with a concentration of 0.5 mol / L to pH 6;

[0037](3) Add 0.07g of transglutaminase (TGase) to the reaction product of step (2), continue to stir at 50°C for 40 minutes, raise...

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Abstract

The invention discloses a preparation method of a gelatin-chitosan composite membrane. The method includes the steps that chitosan is added into a three-opening flask at an indoor temperature, then deionized water is added, stirring is conducted for 3-5 minutes, an acid solution is added while stirring is conducted after the chitosan is evenly dispersed, the pH value is adjusted to be 3.5-6, sufficient stirring is conducted continuously, and accordingly a chitosan solution is obtained; a gelatin solution and the chitosan solution are mixed, and PEG 200 is added into the gelatin / chitosan mixed solution; afterwards, the solution is neutralized by a weak NaOH solution till the pH value is 6; transglutaminase (TGase) is added, stirring is conducted to enable gelatin and chitosan to undergo crosslinking, then the solution is heated to be boiled, enzyme denaturalixation is carried out for 8-12 minutes, defoaming is conducted when the temperature of the solution is lowered to the indoor temperature, and membrane casting is achieved. The time needed for dissolving the chitosan can be shortened obviously, efficiency is improved, and after the TGase undergoes catalytic crosslinking, the water solubility, swelling ratio and moisture permeability of the gelatin-chitosan composite membrane are lowered. The gelatin-chitosan composite membrane can play obvious antibacterial and fresh-keeping effects when being used for packaging fruits.

Description

technical field [0001] The invention belongs to the technical field of packaging films, and in particular relates to a preparation method and application of a gelatin-chitosan composite film. Background technique [0002] Plastic has the advantages of light weight, durability, low cost and easy molding and processing, and has become the most popular packaging material at present. However, plastic packaging materials lack the value of recycling. After use, most of them are discarded in the environment, causing serious environmental pollution due to refractory treatment, such as: mixing in the soil, affecting crops to absorb nutrients and water, resulting in crop yield reduction The seepage of plasticizers and additives will lead to groundwater pollution; mixed with urban waste and incinerated together will produce harmful gases, pollute the air, and endanger human health; landfill treatment will occupy land for a long time (plastic waste stays in nature for a long time , gen...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08L89/00C08J3/24C08J5/18B65D65/02
Inventor 宋慧君高玉梅魏媛许志忠俞显芳
Owner HENAN INST OF ENG
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