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Preparation method of nanocellulose antibacterial sustained-release film

A technology of nanocellulose and sustained-release film, applied in the field of preparation of nanocellulose antibacterial sustained-release film, can solve the problems such as nano-cellulose antibacterial sustained-release film, which can prolong the storage and preservation time of food and achieve good mechanical properties. and antibacterial slow-release function, the effect of inhibiting the growth of microorganisms

Inactive Publication Date: 2019-01-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the preparation of nanocellulose antibacterial slow-release film by directly mixing oxidized nanocellulose and nisin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of nanocellulose antibacterial sustained-release film is as follows:

[0022] 1) Using bleached bagasse fiber as raw material, adopting mechanical grinding method to prepare nanocellulose colloid with a mass concentration of 5%, the obtained nanocellulose has a diameter of 2-20 nm and a length of 0.1-100 μm;

[0023] 2) Weigh 100 parts (by weight, the same below) of nanocellulose colloid, 0.08 part of 2,2,6,6-tetramethylpiperidine-1-oxide powder and 0.52 part of NaBr powder, mix at room temperature Evenly and dilute with distilled water to a solid content of 1%, add 0.4 parts of NaClO solution with an available chlorine concentration of 112g / l, then adjust the pH value of the system to 10 with a hydrochloric acid solution with a concentration of 0.5mol / L, and keep the reaction temperature at 25°C. During the reaction process, the pH value of the system decreased all the time, and the pH value of the system was maintained at 10 by dripping th...

Embodiment 2

[0029] A kind of preparation method of nanocellulose antibacterial sustained-release film is as follows:

[0030] 1) Using bleached coniferous wood fiber as raw material, the nanocellulose colloid with a mass concentration of 5% is prepared by mechanical grinding, and the obtained nanocellulose has a diameter of 2-20 nm and a length of 0.1-100 μm;

[0031] 2) Weigh 100 parts (by weight, the same below) of nanocellulose colloid, 0.08 part of 2,2,6,6-tetramethylpiperidine-1-oxide powder and 0.52 part of NaBr powder, mix at room temperature Evenly and dilute with distilled water to a solid content of 1%, add 2 parts of NaClO solution with an available chlorine concentration of 112g / l, then adjust the pH value of the system to 10 with a hydrochloric acid solution with a concentration of 0.5mol / L, and keep the reaction temperature at 25°C. During the reaction process, the pH value of the system decreased all the time, and the pH value of the system was maintained at 10 by dripping ...

Embodiment 3

[0037] A kind of preparation method of nanocellulose antibacterial sustained-release film is as follows:

[0038] 1) Using bleached broad-leaved wood fiber as raw material, the nanocellulose colloid with a mass concentration of 5% is prepared by mechanical grinding, and the obtained nanocellulose has a diameter of 2-20 nm and a length of 0.1-100 μm;

[0039] 2) Weigh 100 parts (by weight, the same below) of nanocellulose colloid, 0.08 part of 2,2,6,6-tetramethylpiperidine-1-oxide (TEMPO) powder and 0.52 part of NaBr powder, Mix well at room temperature and dilute to a solid content of 1% with distilled water, add 4 parts of NaClO solution with an available chlorine concentration of 112g / l, then adjust the pH value of the system to 10 with a hydrochloric acid solution with a concentration of 0.5mol / L, and keep the reaction temperature at 25°C, the pH value of the system keeps decreasing during the reaction process, and the pH value of the system is maintained at 10 by adding a ...

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Abstract

The invention discloses a preparation method of a nanocellulose antibacterial sustained-release film. The method comprises the following steps: firstly, weighing 100 parts of nanocellulose colloid, 0.08 part of TEMPO powder and 0.52 part of NaBr powder, and diluting the substances with distilled water until the solid content is 1 percent; adding 0.4 to 4 parts of NaClO solution, adjusting and keeping a pH value of the system to 10, adding absolute ethyl alcohol and enabling the reaction to be ended; then centrifugally washing to obtain nanocellulose oxide; secondly, taking the nanocellulose colloid and a nanocellulose oxide sustained-release control agent, mixing and diluting until the solid content is 1 percent to obtain mixed nanocellulose suspension; thirdly, preparing a nisin solutionwith the concentration of 1 percent, adding the solution into the mixed nanocellulose suspension, and carrying out magnetic stirring to obtain a film forming liquid; fourthly, pouring the film formingliquid into a die and drying to obtain the nanocellulose antibacterial sustained-release film. The antibacterial sustained-release film prepared by the preparation method disclosed by the invention has good mechanical properties and slow release function of an antibacterial agent and can effectively inhibit the growth of microorganisms.

Description

technical field [0001] The invention belongs to the technical field of preparation of packaging films, in particular to a preparation method of a nano-cellulose antibacterial slow-release film. Background technique [0002] Antimicrobial packaging is an effective way to combine packaging materials with antimicrobial agents in various ways to improve food shelf life and safety. Antibacterial agents are the core and soul of antibacterial packaging. Antibacterial agents are generally divided into inorganic antibacterial agents, organic antibacterial agents and natural antibacterial agents. Nisin is a kind of natural biologically active cationic antibacterial protein, and it is also the only preservative bacteriocin allowed by the country as a food safety additive. Nisin can be used in composite packaging with different degradable materials, for example, compounding nisin in a layer-by-layer self-assembled bacterial cellulose film can effectively inhibit the growth of Listeria ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/04C08L89/00C08B15/02
CPCC08B15/02C08J5/18C08J2301/04C08J2489/00
Inventor 鲁鹏吴敏王磊刘汉东高琳
Owner GUANGXI UNIV
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