Preparation technology of onion polysaccharide-gelatin composite film
A preparation process and composite film technology, which can be used in flexible coverings, packaging, wrapping paper, etc., can solve the problems of weak starch antioxidant capacity and poor fresh-keeping effect of single film making, and achieve improved oxidation resistance and obvious application value. Effect
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Embodiment 1
[0039] Chapter 1 The preparation process of onion polysaccharide-gelatin composite film, the steps are as follows:
[0040] (1) Extraction of onion polysaccharide crude extract
[0041] ① Slice fresh onions, dry them in a constant-temperature blast drying oven at 60-70°C, and then pulverize them, then sieve them to obtain dry onion powder, store them in a sealed and dry place at low temperature, and store them for later use;
[0042] ②Mix the dry onion powder and absolute ethanol evenly according to the weight ratio of 1:8-12, reflux and degrease in a water bath environment at 70-75°C for 1.5-2 hours, degrease twice in total, filter with suction and collect the filter residue;
[0043] ③Mix the filter residue and water according to the ratio of parts by weight to filter residue: water=1:30~60, place the filter residue in a constant temperature water bath at 70~85°C for 3~6 hours, and then filter for 3~6 hours, then repeatedly extract the filter residue for 3 Once, the combine...
Embodiment 2
[0166] The preparation technology of onion polysaccharide-gelatin composite film, the steps are as follows:
[0167] (1) Extraction of onion polysaccharide crude extract
[0168] ① Slice fresh onions, dry them in a constant-temperature blast drying oven at 70°C, and then pulverize them, then sieve them to obtain dry onion powder, store them in airtight and dry storage at low temperature, and store them for later use;
[0169] ②Mix the dry onion powder and absolute ethanol evenly in a ratio of 1:12 by weight, reflux and degrease in a water bath at 75°C for 2 hours, degrease twice in total, filter with suction and collect the filter residue;
[0170] ③Mix the filter residue and water evenly according to the ratio of the weight of the filter residue: water = 1:60, place it in a constant temperature water bath at 85°C, heat and reflux for extraction for 6 hours, and then filter. Repeat the extraction of the filter residue 3 times, combine the filtrate and concentrate The concentr...
Embodiment 3
[0177] The preparation technology of onion polysaccharide-gelatin composite film, the steps are as follows:
[0178] (1) Extraction of onion polysaccharide crude extract
[0179] ① Slice fresh onions, dry them in a constant temperature blast drying oven at 60°C, and then pulverize them, and then sieve them to obtain dry onion powder, store them in a sealed and dry place at low temperature, and store them for later use;
[0180] ②Mix the dry onion powder and absolute ethanol evenly in a ratio of 1:8 by weight, reflux and degrease in a water bath at 70°C for 1.5 hours, degrease twice in total, filter with suction and collect the filter residue;
[0181] ③Mix the filter residue and water evenly according to the ratio of the weight of the filter residue: water = 1:30, put it in a constant temperature water bath at 70°C, heat and reflux for extraction for 3 hours, and then filter. Repeat the extraction of the filter residue 3 times, combine the filtrate and concentrate To obtain a...
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