Juicy food packaging biodegradable chitosan film preparation method

A technology of food packaging and chitosan, which is applied in the field of preparation of degradable chitosan film, can solve the problems of weak antibacterial ability, weak anti-oxidation ability, high brittleness, etc., achieve obvious mechanical enhancement effect and improve anti-oxidation Sex, improve the effect of non-polarity

Inactive Publication Date: 2015-02-25
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention proposes is a kind of preparation method of the degradable chitosan film used for the multi-moisture food packaging of high strength, high anti-oxidation ability and high antibacterial performance, and its purpose is to overcome the low mechanical strength of chitosan in practical application, Disadvantages such as high brittleness, weak anti-oxidation ability, poor moisture resistance and acid resistance, and weak antibacterial ability

Method used

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Examples

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preparation example Construction

[0015] A preparation method of degradable chitosan film for multi-moisture food packaging, comprising the steps of:

[0016] (1) Add the acetic acid solution to the ethanol solution dispersed with nanocellulose, adjust the pH value to 4-5, then add the silane coupling agent, stir for 40-60 minutes, centrifugally wash to neutrality and freeze-dry to obtain Alkylated nanocellulose;

[0017] (2) Dissolve chitosan powder in acetic acid or other weak acid aqueous solution, heat to 40-60°C and stir evenly for 15-20 minutes to completely dissolve chitosan, then add the alkane obtained in step (1) to the solution Base nano-cellulose, fully stir at 45-55°C for 30-45 minutes, remove impurities by suction filtration, and then undergo ultrasonic treatment for 10-20 minutes to obtain nano-cellulose / chitosan solution;

[0018] (3) Dissolve gallic acid in ethanol, and add 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide respectively to the gallic acid ethan...

Embodiment

[0025] (1) Slowly drop 5% acetic acid into 100ml of ethanol solution dispersed with nanocellulose, adjust the pH to 4.5, then add 10ml of silane coupling agent solution with a mass fraction of 10g / L, stir for 60 minutes, and centrifuge After being washed to neutrality, freeze-dried to obtain alkylated nanocellulose.

[0026] (2) 0.5g chitosan powder is dissolved in 100ml volume percent concentration and is 1% in the acetic acid aqueous solution, is heated to 50 ℃ and stirs evenly for 20 minutes to make chitosan dissolve completely, then add step ( 1) 0.05 g of the obtained alkylated nanocellulose was fully stirred at 45° C. for 40 minutes, filtered to remove impurities, and then subjected to ultrasonic treatment for 15 minutes to obtain a nanocellulose / chitosan solution.

[0027] (3) Dissolve 0.04g of gallic acid in 5ml of ethanol, stir evenly for 5 minutes, and add 0.04g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide to the gallic acid ethanol solution Hydrochloride, react ...

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Abstract

The invention discloses a juicy food packaging biodegradable chitosan film preparation method. The method includes dissolving chitosan powder into acetic acid solution, then adding alkylated nano cellulose, mixing completely, filtering and purifying, and obtaining alkylated nano cellulose / chitosan solution through ultrasound treatment; dissolving gallic acid or gallic acid ester substances into ethanol, adding 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide reagent for full reaction, adding the mixture into the alkylated nano cellulose / chitosan solution, stirring at low temperature, placing at room temperature, performing ultrasonic dispersion and vacuum deaeration treatment, drying, and obtaining the film; soaking with alkali solution, flushing and treating through water till neutral, drying at room temperature, and obtaining the product. The method has the advantages that the chitosan is modified through the nano cellulose and gallic acid, and the tensile strength, oxidation resistance and antibacterial properties of the chitosan film are improved greatly.

Description

technical field [0001] The invention relates to a preparation method of a degradable chitosan film for multi-moisture food packaging. The film is mainly composed of chitosan, alkylated nanocellulose and gallic acid, and has high strength, anti-oxidation It has the advantages of strong ability and antibacterial ability, and is a fully degradable biomass composite material. Background technique [0002] "Using renewable resources to synthesize environment-friendly chemicals without using or producing harmful substances" has become an international frontier field of science and technology. Renewable resources mainly refer to natural biopolymer materials such as animals, plants and microorganisms in nature. After use, they are easily decomposed by microorganisms in nature into water, carbon dioxide and small inorganic molecules, which are truly environmentally friendly materials. With the continuous development and improvement of nanotechnology, more and more natural biopolymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L5/08C08L1/12
Inventor 何文蒋波蒋胜均奉欢刘文超
Owner NANJING FORESTRY UNIV
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