A kind of carboxymethyl chitosan/formylated carboxymethyl cellulose composite film and preparation method thereof

A technology of carboxymethyl chitosan and carboxymethyl cellulose is applied in the field of carboxymethyl chitosan/formaldehyde carboxymethyl cellulose composite film and its preparation, which can solve problems such as toxicity and achieve enhanced antibacterial properties. , The effect of preventing microbial contamination and good mechanical properties

Active Publication Date: 2022-03-04
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the natural traditional Chinese medicine matrine has certain toxicity to the human body, and it also has certain risks to the human body when it is used in food preservation.

Method used

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  • A kind of carboxymethyl chitosan/formylated carboxymethyl cellulose composite film and preparation method thereof
  • A kind of carboxymethyl chitosan/formylated carboxymethyl cellulose composite film and preparation method thereof
  • A kind of carboxymethyl chitosan/formylated carboxymethyl cellulose composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Dissolve carboxymethylcellulose in water, stir at 30°C to form a carboxymethylcellulose solution with a mass fraction of 0.5%, and place it in a round-bottomed flask. Dissolve 1.5 times mol of sodium periodate in deionized water, shake to dissolve and add to a round bottom flask. The flask was wrapped in tin foil and protected from light. After 2.5 h of reaction, 8 mL of ethylene glycol was added to terminate the reaction for 1 h. The reaction solution was put into a 3500Da dialysis bag and purified by dialysis in deionized water for 72 hours. The water was changed every 12 hours. After three days, it was concentrated by rotary evaporation. Hydroformylated carboxymethyl cellulose with a degree of hydroformylation of 13%.

[0036] (2) get carboxymethyl chitosan (CMCS) to be dissolved in water respectively and form the carboxymethyl chitosan solution that mass fraction is 1.5%, 2.0%, 2.5%, then add appropriate amount of formaldehyde carboxymethyl cellulose, make Th...

Embodiment 2

[0045] (1) Dissolve carboxymethylcellulose in water, stir at 30°C to form a carboxymethylcellulose solution with a mass fraction of 0.8%, and place it in a round-bottomed flask. Dissolve 2 times mol of sodium periodate in deionized water, shake to dissolve and add to a round bottom flask. The flask was wrapped in tin foil and protected from light. After 2.5 h of reaction, 10 mL of ethylene glycol was added to terminate the reaction for 1 h. The reaction solution was put into a 3500Da dialysis bag and purified by dialysis in deionized water for 72 hours. The water was changed every 12 hours. After three days, it was concentrated by rotary evaporation. Hydroformylated carboxymethyl cellulose with a degree of hydroformylation of 15%.

[0046] (2) Dissolve carboxymethyl chitosan in water to form a carboxymethyl chitosan solution with a mass fraction of 2.0%, and then add an appropriate amount of carboxymethyl cellulose (CMC-CHO) to make the coating solution The mass fractions o...

Embodiment 3

[0054] (1) Dissolve carboxymethyl cellulose in water, stir at 30° C. to form a carboxymethyl cellulose solution with a mass fraction of 1%, and put it in a round bottom flask. Dissolve 2.5 times mol of sodium periodate in deionized water, shake to dissolve and add to a round bottom flask. The flask was wrapped in tin foil and protected from light. After 2.5 h of reaction, 12 mL of ethylene glycol was added to terminate the reaction for 1 h. The reaction solution was put into a 3500Da dialysis bag and purified by dialysis in deionized water for 72 hours. The water was changed every 12 hours. After three days, it was concentrated by rotary evaporation. Hydroformylated carboxymethyl cellulose with a degree of hydroformylation of 15%.

[0055] (2) Dissolve carboxymethyl chitosan in water to form a carboxymethyl chitosan solution with a mass fraction of 2.0%, then add an appropriate amount of carboxymethyl cellulose to form carboxymethyl cellulose in the coating solution The pri...

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Abstract

The invention discloses a carboxymethyl chitosan / formylated carboxymethyl cellulose composite film and a preparation method thereof. Carboxymethyl cellulose is dissolved in water to obtain a carboxymethyl cellulose solution, which is mixed with an aqueous solution of sodium periodate Mix evenly for light-shielding reaction, then add ethylene glycol to terminate the reaction, the resulting reaction solution is purified by dialysis, concentrated, and vacuum-dried to obtain carboxymethyl cellulose; carboxymethyl chitosan is dissolved in water to obtain carboxymethyl shell polysaccharide solution, then add aldehydated carboxymethyl cellulose and plasticizer, stir and mix evenly to obtain a coating solution; evenly coat the coating solution on the substrate, eliminate air bubbles and then dry to form a film. The carboxymethyl chitosan / formylated carboxymethyl cellulose composite film of the present invention has good mechanical properties; the water vapor transmission rate is high, has good absorptivity to ultraviolet light, can effectively block the destructive effect of ultraviolet rays, and Aspergillus niger and Penicillium have good inhibitory effect.

Description

technical field [0001] The invention belongs to the technical field of food preservation and antibacterial materials, and in particular relates to a carboxymethyl chitosan / formylated carboxymethyl cellulose composite film and a preparation method thereof. Background technique [0002] Fruits and vegetables are the main sources of human intake of essential vitamins and inorganic salts, and are important foods to ensure human health. With the improvement of people's quality of life, the demand for fruits and vegetables is also increasing, but the shelf life of fruits and vegetables is short and perishable, and is also limited by seasons and regions. In 2019, the planting area of ​​vegetables and fruits in my country was 33,140 square kilometers, and the annual output of fruits reached 274 million tons. The loss rate after harvest was as high as 30% due to improper storage and transportation and imperfect fresh-keeping technology. The purpose of fruit and vegetable preservatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L5/08C08L1/28
CPCC08J5/18C08J2305/08C08J2401/28
Inventor 姚忠曹立妤吴若寒孙芸朱本伟
Owner NANJING TECH UNIV
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