Edible composite film and preparation method thereof
A composite film, food-based technology, applied in the field of composite film, can solve the problems of poor toughness and low mechanical strength, and achieve the effect of good oxygen barrier.
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[0031] The preparation method of above-mentioned edible composite film, comprises the following steps:
[0032] (1) Weigh water-soluble chitosan, add distilled water to form a chitosan solution with a mass percentage concentration of 1.5% to 3%, and stir for 15 to 45 minutes in a constant temperature water bath at 70 to 80°C to make the chitosan completely dissolve, spare;
[0033] (2) Weigh the modified starch, add distilled water to make a modified starch paste aqueous solution with a mass percentage concentration of 2% to 4%, and swell and stir it in a constant temperature water bath at 85 to 95°C for 15 to 45 minutes to prepare a modified starch Paste solution, keep warm for later use;
[0034] (3) Blend the above-mentioned chitosan solution and the modified starch paste solution in a ratio of (50-80) by volume: (20-50), and stir in a constant temperature water bath at 70°C for 40-60 minutes to obtain a blended solution ;
[0035] (4) Add plasticizer at 0.6% to 1% of th...
Embodiment 1
[0039] (1) Take by weighing 16 grams of water-soluble chitosan, add 784 grams of distilled water to form a chitosan solution with a concentration of 2%, and stir for 30 minutes at 70-80°C in a constant temperature water bath to dissolve the chitosan completely, spare;
[0040] (2) Take by weighing 18 grams of cross-linked hydroxypropyl starch, add 582 grams of distilled water to make a starch solution with a concentration of 3%, and swell and stir for 30 minutes at 85-95°C in a constant temperature water bath to prepare a starch paste solution, Insulation standby;
[0041] (3) Blending the above-mentioned 400 milliliters of chitosan solution with 100 milliliters of modified starch paste solution, and stirring in a constant temperature water bath at 70° C. for 50 minutes to obtain a blended solution;
[0042] (4) Add 4 milliliters of glycerin, 2.5 grams of stearic acid and 2.5 grams of palmitic acid, stir and dissolve in a water bath at 85°C for 30 minutes, and set aside;
[...
Embodiment 2
[0045] (1) Take by weighing 16 grams of water-soluble chitosan, add 1050 grams of distilled water to form a chitosan solution with a concentration of 1.5%, and stir for 15 minutes at 70-80°C in a constant temperature water bath to dissolve the chitosan completely, spare;
[0046] (2) Weigh 18 grams of esterified starch, add 432 grams of distilled water to form a starch solution with a concentration of 4%, and swell and stir it for 45 minutes in a constant temperature water bath at 85-95°C to prepare a starch paste solution, which is kept warm for subsequent use;
[0047] (3) Blending the above-mentioned 400 milliliters of chitosan solution with 400 milliliters of modified starch paste solution, and stirring in a constant temperature water bath at 70° C. for 60 minutes to obtain a blended solution;
[0048] (4) Add 4.8 milliliters of sorbitol and 16 grams of stearic acid, stir and dissolve in a water bath at 85°C for 40 minutes, and set aside;
[0049] (5) Filter the blend sol...
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