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Edible antibacterial film and preparation method thereof

An antibacterial film and edible technology, which is applied in the field of edible antibacterial film and its preparation, can solve the problems of short antibacterial period, poor mechanical properties, weak water blocking ability, etc., to achieve increased steric hindrance effect, improve water blocking, Stabilizes the effect of antibacterial action

Inactive Publication Date: 2021-03-09
YUNCHENG POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a modified cellulose nanofibril reinforced methylcellulose / wheat gluten edible antibacterial film and its preparation method, which solves the problem of edible antibacterial film in the prior art There are problems such as poor mechanical properties, weak water blocking ability and short antibacterial period

Method used

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Effect test

preparation example Construction

[0021] A preparation method of an edible antibacterial film, comprising the following steps:

[0022] S1. Preparation of cation-modified cellulose nanofibrils: Mix dissolving pulp, NaOH and water to obtain wet slurry, add it to the refiner for 3-5 times of circular refining, add cationic etherifying agent and isopropanol , wherein the molar ratio of the cationic etherification agent to the dissolving pulp is 1 to 3, the amount of isopropanol added is 10% to 50% of the absolute dry pulp, and the pulp is circulated for 3 to 5 times; the ground pulp is placed in 35 React in a water bath at ℃~65℃ for 1h~4h. After the reaction, take out the slurry, vacuum filter and wash until the filtrate is neutral; dilute to a concentration of 0.5%~2%, high-pressure homogeneous circulation under 40~80MPa pressure 10 to 30 times to obtain cationic modified cellulose nanofibrils;

[0023] S2. Dissolution of membrane solution: After initially mixing methylcellulose and wheat gluten, slowly add it ...

Embodiment 1

[0030] (1) Accurately weigh 400g of dissolving pulp, 142.2g of NaOH, and 800g of distilled water. After the initial mixing of the three, add them to the KRK refiner, adjust the gap between the grinding discs to 1mm, and circulate the pulp for 3 times; then, add 334.4g of glycidyl Trimethylammonium chloride, 200mL isopropanol, adjust the gap between the grinding discs to 0.5mm, and circulate the slurry 3 times; take out the ground slurry into a ziplock bag, and react in a water bath at 55°C for 4h. After the reaction, vacuum filter to The filtrate is neutral; finally, the washed slurry is diluted to a concentration of 1%, and the high-pressure homogeneous cycle is performed 20 times under a pressure of 60 MPa to obtain cationic modified cellulose nanofibrils;

[0031] (2) Weigh a certain amount of methyl cellulose and wheat gluten according to the ratio of 6:4. After the two are initially mixed, slowly add them to a 50% ethanol solution, adjust the concentration of the membrane ...

Embodiment 2

[0035] (1) Accurately weigh 400g of dissolving pulp, 142.2g of NaOH, and 800g of distilled water. After the initial mixing of the three, add them to the KRK refiner, adjust the gap between the grinding discs to 1mm, and circulate the pulp for 3 times; then, add 334.4g of glycidyl Trimethylammonium chloride, 200mL isopropanol, adjust the gap between the grinding discs to 0.5mm, and circulate the slurry 3 times; take out the ground slurry into a ziplock bag, and react in a water bath at 55°C for 4h. After the reaction, vacuum filter to The filtrate is neutral; finally, the washed slurry is diluted to a concentration of 1%, and the high-pressure homogeneous cycle is performed 20 times under a pressure of 60 MPa to obtain cationic modified cellulose nanofibrils;

[0036] (2) Weigh a certain amount of methyl cellulose and wheat gluten according to the ratio of 6:4. After the two are initially mixed, slowly add them to a 50% ethanol solution, adjust the concentration of the membrane ...

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Abstract

The invention relates to the technical field of edible packaging materials, in particular to an edible antibacterial film and a preparation method thereof. Raw materials comprise dissolving pulp, a cationic etherifying agent, methyl cellulose, wheat gluten protein, glycerol, lipids and a natural antibacterial agent. Electrostatic repulsion and steric hindrance effects among molecules of the cationic modified cellulose nanofibril are utilized, so that uniform distribution of the nanofibril in an edible film matrix is facilitated, and the nano-sized reinforcing and toughening effects of the nanofibril are brought into full play; by means of the long-acting stable antibacterial effect of the grafted quaternary ammonium salt group and in combination with the addition of the natural quick-acting antibacterial agent, the edible film is endowed with a good antibacterial effect, the shelf life of a packaged product is prolonged, and the product quality is improved; and besides, the selected raw materials are natural edible macromolecular polymers, so that the edible composite film has no toxic or side effect on a human body and is low in cost, dependence and use of petroleum resources arereduced, and the edible composite film is simple in preparation process and convenient to operate, thereby having a relatively good market application prospect.

Description

technical field [0001] The invention relates to the technical field of edible packaging materials, more specifically, to an edible antibacterial film and a preparation method thereof. Background technique [0002] With the development of the economy and people's pursuit of quality of life, the packaging of commodities is becoming more and more important. According to statistics, the global consumer market for packaging materials and containers reached US$1,017.3 billion in 2018. Plastic products account for the vast majority of this consumer market due to their cheap price and stable properties. However, since most plastic products use petroleum-based raw materials, they are not easily degraded while consuming resources, and are likely to cause "white pollution"; and some harmful substances in plastic food packaging will migrate into food, thereby affecting food quality. Therefore, exploring and developing volatile, degradable, edible and reusable green packaging materials ...

Claims

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Application Information

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IPC IPC(8): C08L1/28C08L89/00C08L91/06C08K5/053C08K5/00C08K5/09C08K5/07C08K5/13C08J5/18B65D65/46
CPCC08J5/18B65D65/463C08J2301/28C08J2489/00C08J2491/06C08K5/053C08K5/0058C08K5/09C08K5/07C08K5/13
Inventor 段林娟李静汪伟
Owner YUNCHENG POLYTECHNIC COLLEGE
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