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A kind of preparation method of cellulose/chitosan-based nano fresh-keeping drug-loaded sponge

A technology of chitosan and cellulose, which is applied in the field of food packaging materials, can solve the problems that the antiseptic and antibacterial properties cannot be fully exerted, and the excellent properties are discounted, so as to achieve good loading and controlled release capacity, delay corruption, and important social and economic benefits Effect

Active Publication Date: 2020-07-24
RES INST OF ZHEJIANG UNIV TAIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, using chitosan's good processability and antibacterial activity, research on the preparation of degradable sponge materials using chitosan as a raw material is relatively extensive, such as chitosan for clinical medical purposes published in Chinese patents CN200610036069 and CN200710031328 Sponges, but the antibacterial properties of such materials can only be well reflected in the case of in-depth interaction with biological systems. For the field of food packaging, although chitosan-based degradable packaging materials can effectively increase the CO2 in fruit and vegetable tissues 2 content, reduce O 2 content, inhibit respiration and water loss, and slow down the aging of fruit and vegetable tissues and mechanisms, but its antiseptic and antibacterial properties cannot be fully exerted, which greatly reduces the excellent properties of this potential food packaging material

Method used

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  • A kind of preparation method of cellulose/chitosan-based nano fresh-keeping drug-loaded sponge

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Experimental program
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Effect test

Embodiment 1

[0019] (1) Take sodium carboxymethyl cellulose and chitosan powder according to the mass ratio of 2:1; wherein the degree of substitution of sodium carboxymethyl cellulose is 0.7, the degree of deacetylation of chitosan is 50%, and carboxymethyl Sodium cellulose was dissolved in distilled water to form a 2% sodium carboxymethylcellulose solution, chitosan was dissolved in acetic acid solution to form a chitosan solution with a concentration of 1.5%, and the pH of the two solutions was adjusted with hydrochloric acid to 1.0;

[0020] (2) Blend the two solutions in step (1), add nano-titanium dioxide, bentonite, glycerin, stir evenly, and let it stand for defoaming; wherein, the particle size of nano-titanium dioxide is 60 nm, and the amount added is 1% of the total dry matter. %, the density of bentonite is 2~3g / cm3, the amount added is 6% of the total dry matter, and the amount of glycerin added is 4% of the total dry matter;

[0021] (3) Pour the mixed liquid obtained in ste...

Embodiment 2

[0023] (1) Take sodium carboxymethyl cellulose and chitosan powder according to the mass ratio of 3:1; wherein the degree of substitution of sodium carboxymethyl cellulose is 0.8, the degree of deacetylation of chitosan is 60%, and the carboxymethyl Sodium cellulose was dissolved in distilled water to form a 2% sodium carboxymethylcellulose solution, chitosan was dissolved in acetic acid solution to form a chitosan solution with a concentration of 1.5%, and the pH of the two solutions was adjusted with hydrochloric acid to 1.0;

[0024] (2) Blend the two solutions in step (1), add nano-titanium dioxide, bentonite, glycerin, stir evenly, and let it stand for defoaming; wherein, the particle size of nano-titanium dioxide is 150 nm, and the amount added is 4% of the total dry matter. %, the bentonite density is 2~3g / cm3, the addition is 4% of the total dry matter, and the glycerin addition is 4% of the total dry matter;

[0025] (3) Pour the mixed liquid obtained in step (2) int...

Embodiment 3

[0027] (1) Take sodium carboxymethyl cellulose and chitosan powder according to the mass ratio of 4:1; wherein the degree of substitution of sodium carboxymethyl cellulose is 0.7, the degree of deacetylation of chitosan is 50%, and carboxymethyl Sodium cellulose was dissolved in distilled water to form a 2% sodium carboxymethylcellulose solution, chitosan was dissolved in acetic acid solution to form a chitosan solution with a concentration of 1.5%, and the pH of the two solutions was adjusted with hydrochloric acid to 1.0;

[0028] (2) Blend the two solutions in step (1), add nano-titanium dioxide, bentonite, glycerin, stir evenly, and let it stand for defoaming; wherein, the particle size of nano-titanium dioxide is 60 nm, and the amount added is 7% of the total dry matter. %, the density of bentonite is 2~3g / cm3, the amount added is 2% of the total dry matter, and the amount of glycerin added is 4% of the total dry matter;

[0029] (3) Pour the mixed liquid obtained in ste...

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Abstract

The invention relates to a preparation method of a cellulose / chitosan-based nano-preservation drug-loaded sponge, which belongs to the technical field of food packaging materials. The invention uses sodium carboxymethyl cellulose and chitosan as main base materials. The steps of the preparation method include: firstly dissolving sodium carboxymethylcellulose and chitosan in distilled water and acetic acid solution according to a certain mass ratio, then blending the two solutions, using hydrochloric acid to adjust the pH value to 1.0, and then Add antibacterial factor nano-titanium dioxide, ethylene adsorption factor bentonite and plasticizer glycerin, stir well, let it stand for defoaming, and finally pour it into a mold, and vacuum freeze-dry to form a sponge product. The product is non-toxic, harmless, biodegradable, and environmentally friendly; the product is added with nano-antibacterial factors and ethylene adsorption factors, which not only have the basic mechanical buffer properties of filled sponges, but also have excellent antibacterial and fresh-keeping effects .

Description

technical field [0001] The invention belongs to the technical field of food packaging materials, and relates to a preparation method of a spongy material, in particular to a preparation method of a biodegradable packaging filling sponge with an antibacterial and fresh-keeping effect. Background technique [0002] With the increasingly serious problem of environmental pollution, non-toxic, degradable, and green packaging materials have become a current research hotspot. For a long time, the traditional preservation technology of tropical fruits mainly relies on the medicament soaking of fruits and the use of petroleum-derived plastic products. Although the method of chemical immersion is simple and efficient, there are hazards and risks of chemical residues to human health; on the one hand, the use of plastic packaging has food safety problems caused by the migration of small molecular organic substances to food, and on the other hand, it has also caused energy consumption. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/28C08L5/08C08K3/22C08K3/34C08K5/053C08J9/28
CPCC08J9/28C08J2201/0482C08J2201/0484C08J2301/28C08J2405/08C08K2003/2241C08K2201/003C08K2201/011C08L1/286C08L2201/06C08L2203/14C08L5/08C08K3/22C08K3/346C08K5/053
Inventor 钟恬黄然
Owner RES INST OF ZHEJIANG UNIV TAIZHOU
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