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Sargassum pallidum crude polysaccharide/chitosan edible composite membrane as well as preparation method and application thereof

A technology of crude polysaccharide and Artemisia japonica, applied in the direction of flexible covering, packaging, wrapping paper, etc., can solve the problems of increasing cross-linking, reducing the degree of cross-linking, ineffective exposure of sulfur amino acids, etc., and achieving increased compatibility. , the effect of high mechanical properties

Active Publication Date: 2021-02-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the 80% ethanol solution containing the protein component is mixed with the chitosan acetic acid solution, the solubility of the protein decreases due to the decrease of the ethanol concentration, resulting in a decrease in the degree of cross-linking.
Protein molecules are usually surrounded by hydrophilic groups and hydrophobic base cores. Under physical conditions such as high temperature and mechanical force, the sulfur-containing amino acids can be exposed, which increases the cross-linking of zein molecules and other molecules, and the technology Simple stirring treatment of the mixed system cannot effectively expose the sulfur amino acids of the zein molecule, resulting in insufficient cross-linking between the zein molecule and the chitosan molecule

Method used

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  • Sargassum pallidum crude polysaccharide/chitosan edible composite membrane as well as preparation method and application thereof
  • Sargassum pallidum crude polysaccharide/chitosan edible composite membrane as well as preparation method and application thereof
  • Sargassum pallidum crude polysaccharide/chitosan edible composite membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) The sea wormwood powder is mixed with water according to the mass-to-volume ratio of material to liquid: 1g:20mL, and extracted at a temperature of 80°C for 2 hours and 2 extraction times; centrifuged, combined extracts, Concentrate under reduced pressure at 50°C to 1 / 4 of the original volume. After concentration, the extract is precipitated with 80% ethanol, dialyzed through a dialysis membrane with a cut-off of 3500Da for 48 hours, and then freeze-dried.

[0037] (2) 0.8g of the crude polysaccharide of Artemisia annua obtained in step 1) is mixed with 2.0g chitosan (deacetylation degree ≥ 90%) powder and dissolved in 100g of acetic acid solution with a mass concentration of 1% to prepare a film-forming solution , add 0.8g glycerin, stir 4h under the condition of 3000rpm;

[0038] (3) Pour the mixed solution in step 2) into a plastic mold, dry in an incubator at 40° C. and 50% RH for 24 hours to obtain an edible composite film of sea wormwood crude polysaccharide / c...

Embodiment 2

[0041] (1) The sea wormwood powder is mixed with water according to the mass-volume ratio of material to liquid: 1g:25mL, and extracted at a temperature of 85°C for 1 hour and 4 extraction times; centrifuged, combined extracts, Concentrate under reduced pressure at 45°C to 1 / 4 of the original volume. After concentration, the extract is precipitated with 85% ethanol, dialyzed through a dialysis membrane with a cut-off of 3500Da for 36 hours, and then freeze-dried.

[0042] (2) 0.4g of the Artemisia chinensis crude polysaccharide obtained in step 1) is mixed with 2.0g chitosan (deacetylation degree ≥ 90%) powder and dissolved in 100g of acetic acid solution with a mass concentration of 1% to prepare a film-forming solution , add 0.6g of glycerin, stir at 5000rpm for 6h;

[0043] (3) Pour the mixed solution in step 2) into a plastic mold, dry in an incubator at 50° C. and 50% RH for 12 hours to obtain an edible composite film of sea wormwood crude polysaccharide / chitosan. This m...

Embodiment 3

[0046] (1) The sea wormwood powder is mixed with water according to the mass-volume ratio of material to liquid: 1g:25mL, and extracted at a temperature of 90°C for 2 hours and 3 extraction times; centrifuged, combined extracts, Concentrate under reduced pressure at 50°C to 1 / 4 of the original volume. After concentration, the extract is precipitated with 90% ethanol, dialyzed through a dialysis membrane with a cut-off of 3500Da for 24 hours, and then freeze-dried.

[0047] (2) 1.2g of Artemisia argyi crude polysaccharide obtained in step 1) is mixed with 2.0g chitosan (degree of deacetylation ≥ 90%) powder and dissolved in 100g of acetic acid solution with a mass concentration of 1% to prepare a film-forming solution , add 0.8g of glycerin, and stir for 6h under the condition of 5000rpm;

[0048] (3) Pour the mixed solution in step 2) into a plastic mold, dry in an incubator at 50° C. and 50% RH for 12 hours to obtain an edible composite film of sea wormwood crude polysacchari...

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Abstract

The invention discloses a sargassum pallidum crude polysaccharide / chitosan edible composite membrane as well as a preparation method and application of the sargassum pallidum crude polysaccharide / chitosan edible composite membrane. The preparation method mainly comprises the following steps: mixing chitosan and sargassum pallidum crude polysaccharide according to a mass ratio of 5: 1-5: 4, dissolving in an acetic acid solution, adding glycerol, and stirring at a high speed to obtain a membrane solution; subjecting the prepared membrane solution to ultrasonic treatment for 20-30 min under the ultrasonic frequency of 20-25 kHz and the ultrasonic power of 100-600 W; immediately pouring the solution subjected to ultrasonic treatment into a plastic mold, and drying in a drying box. Compared with a membrane sample before ultrasonic treatment, the edible composite membrane prepared by the invention has a smooth and transparent surface, the tensile strength is improved by 7N, the elongation atbreak is improved by about 3 times, the oxidation resistance is improved by about 10%, the waterproofness is improved by about 33%, and the edible composite membrane can be used for food preservationon a large scale.

Description

technical field [0001] The invention relates to an edible film, in particular to a sea wormwood crude polysaccharide / chitosan edible composite film and a preparation method and application thereof; it belongs to the technical field of food packaging. Background technique [0002] Nowadays, there are more and more studies on the use of active ingredients (such as proteins, polysaccharides, polyphenols, etc.) extracted from such as grains, vegetables, fruits and marine organisms for food packaging, especially in the field of edible films. The edible film prepared with these active ingredients has good bioactivity and degradability, is green and biocompatible. Polysaccharide-based membranes have good antioxidant activity, and some polysaccharide-based membranes also have certain antibacterial properties. The gas permeability and mechanical properties of the protein-based membrane are good, and it can be used as a carrier of small molecule active substances. The addition of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L5/00C08K5/053C08J5/18C08J3/28B65D65/46
CPCC08J5/18C08J3/28B65D65/463C08J2305/08C08J2405/00C08K5/053
Inventor 李超袁旦扶雄黄强
Owner SOUTH CHINA UNIV OF TECH
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