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A kind of edible composite preservative film with low moisture permeability and preparation method thereof
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A composite fresh-keeping and low moisture permeability technology, applied in the field of fresh-keeping film, can solve the problems of energy consumption (large melting, complex formula, high cost, etc.)
Active Publication Date: 2021-09-14
GUANGXI NORMAL UNIV OF SCI & TECH
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Problems solved by technology
However, the base film of this invention still contains petroleum-based polymers, and the formula is complex, and each component needs to be melted and then extruded and blown to obtain the base film, which means that the requirements for production equipment (needing an extruder) are relatively high. High, at the same time the cost is also high, and the energy consumption (melting) is also large
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preparation example Construction
[0036] 2.1 Preparation of chitosan film
[0037] Chitosan was dissolved in glacial acetic acid solution with a volume fraction of 2%, the stirring temperature was 50°C, the stirring time was 20 minutes, and the chitosan solution was obtained by ultrasonic degassing for 30 minutes. The chitosan solution was quantitatively cast on a flat plate to form a film, dried and peeled off, and set aside.
[0038] 2.2 Preparation of chitosan-nano-ZnO composite film
[0039] Dissolve a certain amount of nano-zinc oxide (nano-ZnO) in glycerin, add 100mL of 2% glacial acetic acid solution, then add 2g of chitosan, stir at 50°C for 20min, and ultrasonically degas for 30min, that is The chitosan-nano-ZnO composite film solution was prepared. The chitosan-nano-ZnO composite film solution was quantitatively cast on a flat plate to form a film, dried and peeled off, and set aside.
[0040] 2.3 Determination of properties of composite membranes
[0041] The prepared composite film was placed a...
Embodiment 1
[0085] Add chitosan, nano-zinc oxide and glycerin in the glacial acetic acid solution whose volume concentration is 2%, the addition amount of chitosan, nano-zinc oxide and glycerol is the concentration of chitosan, nano-zinc oxide and glycerol in the control system respectively 0.02g / mL, 0.004g / mL and 0.004g / mL, then heated up to 50°C, kept stirring for 20 minutes, and then ultrasonically degassed for 30 minutes to obtain a composite membrane solution; the obtained composite membrane solution was cast on a flat plate to form a film, 80 Drying under the condition of ℃, peeling off the film, promptly obtains described low-moisture-permeable edible composite preservative film.
Embodiment 2
[0089] Repeat Example 1, the difference is: adding chitosan, nano-zinc oxide and glycerol in the glacial acetic acid solution with a volume concentration of 1%, ultrasonic degassing for 40min, drying at 60°C after forming a film on a flat plate, uncovering Film, promptly obtains described low moisture permeability edible composite preservative film.
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Abstract
The invention discloses an edible composite fresh-keeping film with low moisture permeability and a preparation method thereof. The preparation method of this preservative film is: adding chitosan, nano-zinc oxide and glycerin in the glacial acetic acid solution whose volume concentration is 1-3%, and the concentration of chitosan, nano-zinc oxide and glycerin in the control system is 0.02g respectively / mL, 0.004g / mL and 0.004g / mL, then heated up to 50°C, kept stirring until uniformly dispersed, and then ultrasonically degassed to obtain a composite membrane solution; the obtained composite membrane solution was cast into a film, dried, and obtained. The composite fresh-keeping film of the present invention has better fresh-keeping effect, and the preparation method is simple, and only needs to be simply mixed and dispersed uniformly, and then cast to form a film, and the production cost is low, and the energy consumption is also low.
Description
technical field [0001] The invention relates to a fresh-keeping film, in particular to an edible composite fresh-keeping film with low moisture permeability and a preparation method thereof. Background technique [0002] The main source of existing food packaging materials is petroleum-based polymers (represented by polyethylene or polypropylene). With the increase in consumption, the environmental pollution and food safety problems caused by this material have become more and more prominent. The birth of edible fresh-keeping packaging materials not only solves the problem of safe and rapid degradation of food packaging materials, but also acts as a barrier to ensure food safety. [0003] Chitosan is a polysaccharide organic polymer obtained by deacetylation of chitin. Chitosan molecules are highly entangled, and there are more crystal structures in highly deacetylated chitosan molecules, and the molecular rigidity is stronger, making it film-forming. In addition, chitosan ...
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