Preparation method of composite preservative film
A composite fresh-keeping and mixture technology is applied in the field of composite fresh-keeping film preparation, which can solve the problems of resource waste, human injury and the like, and achieve the effects of inhibiting breeding, low cost and low production cost.
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Embodiment 1
[0027] A method for preparing a composite fresh-keeping film includes the following steps:
[0028] Step 1: Add 70g of natural polysaccharides to 3wt% acetic acid solution, and heat at 80°C to completely gelatinize to obtain mixture one;
[0029] Step 2: Add emulsifier and plasticizer to mixture one and stir evenly at 80°C to obtain mixture two;
[0030] Step 3: Add the natural functional substance to the water, stir at 30°C until it is completely dissolved, and prepare an aqueous solution of the natural functional substance with a concentration of 1 wt%;
[0031] Step 4. Cool the second mixture of step 2 to 50°C, add protein, heat and stir in a water bath at 40°C for 30 minutes to obtain mixture three;
[0032] Step 5. Mix the mixture 3 and the natural functional substance aqueous solution of step 3, and heat at 60°C for 40 min to obtain mixture 4;
[0033] Step 6. Pour the mixture 4 into the mold and dry it at 60°C to form a film;
[0034] Step 7, cooling the film obtained in step 6 to ...
Embodiment 2
[0043] A method for preparing a composite fresh-keeping film includes the following steps:
[0044] Step 1: Add 80g of natural polysaccharides to 5wt% acetic acid solution, and heat at 100°C to completely gelatinize to obtain mixture one;
[0045] Step 2: Add emulsifier and plasticizer to mixture one and stir evenly at 100°C to obtain mixture two;
[0046] Step 3: Add the natural functional substance to the water and stir at 40°C until it is completely dissolved to prepare an aqueous solution of the natural functional substance with a concentration of 1 wt%;
[0047] Step 4. Cool the second mixture of step 2 to 50°C, add protein, and heat and stir in a water bath at 40°C for 50 minutes to obtain mixture three;
[0048] Step 5: Mix mixture 3 and the natural functional substance aqueous solution of step 3, and heat at 70°C for 50 minutes to obtain mixture 4;
[0049] Step 6. Pour the mixture 4 into the mold and dry it at 80°C to form a film;
[0050] Step 7, cooling the film obtained in ste...
Embodiment 3
[0059] A method for preparing a composite fresh-keeping film includes the following steps:
[0060] Step 1: Add 80g of natural polysaccharides to 3wt% acetic acid aqueous solution, and heat at 100°C to completely gelatinize to obtain mixture one;
[0061] Step 2: Add emulsifier and plasticizer to mixture one and stir evenly at 80°C to obtain mixture two;
[0062] Step 3: Add the natural functional substance to the water, stir at 30°C until it is completely dissolved, and prepare an aqueous solution of the natural functional substance with a concentration of 1.2wt%;
[0063] Step 4. Cool the second mixture of step 2 to 50°C, add protein, and heat and stir in a water bath at 40°C for 50 minutes to obtain mixture three;
[0064] Step 5: Mix mixture 3 and the natural functional substance aqueous solution of step 3, and heat at 60°C for 50 minutes to obtain mixture 4;
[0065] Step 6. Pour the mixture 4 into the mold and dry it at 60°C to form a film;
[0066] Step 7, cooling the film obtained...
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