Preparation method of fruit preservative film
A fresh-keeping film and fruit technology, which is applied in the field of packaging materials, can solve the problems of poor fresh-keeping effect of the fresh-keeping film, unfavorable tearing of the fresh-keeping film, weak antibacterial ability, etc., so as to inhibit the invasion and spread of germs, reduce the water loss of fruits, and achieve antibacterial effects. Excellent effect
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[0023] A kind of preparation method of fruit plastic wrap, this preparation method comprises the steps:
[0024] (1) Mix the pretreated sweet potato dregs and distilled water at a mass ratio of 1:6, boil at a temperature of 90~100°C, cool down to 50~60°C, and add 1.5 mass fraction of 8~10 times the mass of the pretreated sweet potato dregs % to obtain α-amylase solution, sonicate at 40-50°C, heat at 98-100°C to inactivate the enzyme, centrifuge, and take the precipitate;
[0025] (2) According to the mass ratio of 1:10, alkali hydrolyze the precipitate and the sodium hydroxide solution with a volume fraction of 7% at a temperature of 68~70°C, and centrifuge to obtain the precipitate a. According to the mass ratio of 1:10, the precipitate Substance a, hydrogen peroxide with a mass fraction of 20% is bleached at a temperature of 68-70°C, centrifuged and washed to obtain precipitate b;
[0026] (3) According to the mass ratio of 1:10, the precipitate b and sulfuric acid with a m...
Embodiment 1
[0030] Pretreatment of sweet potato dregs: washing sweet potato dregs with water, drying at 70°C for 7 hours, ultrafine grinding, and passing through a 150-mesh sieve to obtain pretreated sweet potato dregs.
[0031] The silane coupling agent is γ-methacryloxypropyltrimethoxysilane.
[0032] The antibacterial solution is to crush the aloe vera, add 15 times the mass of the aloe vera with a volume fraction of 70% ethanol solution, and extract at a temperature of 48°C for 1 hour to obtain the extract, which is the antibacterial solution.
[0033] Modified glucomannan: mix konjac powder and ethanol according to the mass ratio of 1:5, soak for 2 days, centrifuge at 10,000r / min for 25min, collect the filtrate, and dry it in vacuum to obtain a dried product, according to the mass ratio of 1:8: 0.1, mix the dry matter, water, and sodium hydrogen phosphate, stir evenly, adjust the pH value, stir for 1 hour, and dry to obtain modified glucomannan.
[0034] A kind of preparation method...
Embodiment 2
[0041] Pretreatment of sweet potato residue: washing sweet potato residue with water, drying at 80°C for 8 hours, ultrafine grinding, and passing through a 180-mesh sieve to obtain pretreated sweet potato residue.
[0042] The silane coupling agent is γ-methacryloxypropyltrimethoxysilane.
[0043] The antibacterial solution is to crush aloe vera, add 20 times the mass of aloe vera in an 80% ethanol solution, and extract at a temperature of 50°C for 3 hours to obtain an extract, which is an antibacterial solution.
[0044] Modified glucomannan: according to the mass ratio of 1:5, mix konjac powder and ethanol, soak for 3 days, centrifuge at 15000r / min for 30min, collect the filtrate, and dry it in vacuum to obtain the dried product, according to the mass ratio of 1:8: 0.1, mix the dry matter, water, and sodium hydrogen phosphate, stir evenly, adjust the pH value, stir for 3 hours, and dry to obtain modified glucomannan.
[0045] A kind of preparation method of fruit plastic wr...
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