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A kind of preparation method of chitosan fresh-keeping film

A technology of chitosan and plastic wrap, applied in the field of preparation of chitosan plastic wrap, can solve the problems of poor water resistance of plastic wrap, achieve the effects of reducing water permeability, keeping food fresh for a long time, and improving water resistance

Active Publication Date: 2022-03-25
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of poor water resistance of chitosan preservative film, the present invention provides a preparation method of chitosan preservative film. Chitosan is modified by arabinose and compounded with palm oil successively, which can improve the performance of chitosan preservative film , to promote its application in food packaging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 0.05 mol of chitosan with a deacetylation degree of 85% in 500 mL of acetic acid solution with a volume fraction of 1%, add 0.05 mol of arabinose while stirring, react at 80 °C for 3 h, and cool to room temperature , to obtain product A;

[0024] (2) Mix 40 g of product A, 5 g of palm oil, 1 g of alkyl polyglucoside, 5 g of gum arabic and 20 g of modified starch to form mixture B. Speed ​​shear dispersion for 20 min, then add 0.1 g of polydimethylsiloxane, degas under reduced pressure at 0.1 MPa for 1 h, then stir at 300 r / min for 60 min to obtain product C;

[0025] (3) After natural cooling, the product C is evenly coated on an acrylic plate, and dried at 50 ℃ to form a film to obtain the product.

Embodiment 2

[0027] (1) Dissolve 0.05 mol of chitosan with a deacetylation degree of 85% in 200 mL of acetic acid solution with a volume fraction of 2%, add 0.1 mol of arabinose while stirring, react at 100 °C for 2 h, and cool to room temperature , to obtain product A;

[0028] (2) Mix 50 g of product A, 10 g of palm oil, 2 g of alkyl polyglucoside, 10 g of gum arabic and 15 g of modified starch to form mixture B. Speed ​​shear dispersion for 5 min, then add 0.3 g of polydimethylsiloxane, degas under reduced pressure at 0.1 MPa for 2 h, then stir at 400 r / min for 40 min to obtain product C;

[0029] (3) After natural cooling, the product C is evenly coated on an acrylic plate, and dried at 60 ℃ to form a film to obtain the product.

Embodiment 3

[0031] (1) Dissolve 0.05 mol of chitosan with a deacetylation degree of 92% in 100 mL of acetic acid solution with a volume fraction of 3%, add 0.15 mol of arabinose while stirring, react at 120 °C for 1 h, and cool to room temperature , to obtain product A;

[0032] (2) Mix 60 g of product A, 15 g of palm oil, 3 g of alkyl polyglucoside, 8 g of gum arabic and 10 g of modified starch to form mixture B. Speed ​​shear dispersion for 10 min, then add 0.2 g polydimethylsiloxane, degas under reduced pressure at 0.1 MPa for 1.5 h, then stir at 600 r / min for 30 min to obtain product C;

[0033] (3) After natural cooling, the product C is evenly coated on an acrylic plate, and dried at 55 ℃ to form a film to obtain the product.

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Abstract

The invention relates to the field of preservative film preparation. Aiming at the problem of poor water resistance of chitosan film, a method for preparing chitosan preservative film is provided, which includes step 1: chitosan is dissolved in acetic acid solution, and arabinose is added to react to obtain product A ; Two, the mixture comprising 40-60 parts of the above-mentioned product A, 5-15 parts of palm oil and 1-3 parts of emulsifier is sheared and dispersed, degassed under reduced pressure, stirred for 30-60 min; three, after natural cooling Coated on board and dried to form a film. Chitosan of the present invention reacts with arabinose earlier, and the hydrophilic group of chitosan is replaced, and hydrophilicity reduces, and reaction can produce the reductive product that has antioxidant effect; Compound with palm oil again, palm oil and shell The polysaccharide forms hydrogen bonds to weaken the interaction between the hydrophilic group and water in the membrane and reduce the water permeability of the membrane. At the same time, oil droplets are embedded in the molecular gap of chitosan to block some pores and reduce the absorption of water by the membrane, which is better than that of arabinose or palm oil alone. The improvement of membrane hydrophobicity is better.

Description

technical field [0001] The invention relates to the field of preparation of preservative films, in particular to a preparation method of chitosan preservative films. Background technique [0002] The plastic wrap is generally covered on the surface of the food to isolate the food from the air, which can prevent the odor of various dishes in the refrigerator and keep the freshness of the dishes. The plastic wrap is easy to use and affordable, and can be used in microwave food heating, refrigerator food preservation, fresh and cooked food packaging, etc. It is widely used in family life, supermarket stores, hotels and restaurants and food packaging in industrial production. Most of the plastic wraps on the market are made of polyethylene. For example, Chinese Patent Publication No. CN109988354A, titled "A Kind of Fruit and Vegetable Antibacterial Preservative Film and Its Preparation Method", discloses a kind of fruit and vegetable antibacterial plastic wrap in the field of fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L5/08C08L5/00C08L91/00C08L3/02
CPCC08J5/18C08J2305/08C08J2405/00C08J2491/00C08J2403/02
Inventor 刘宇姜维胡世伟李世杰
Owner ZHEJIANG OCEAN UNIV
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