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
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[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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