Edible composite film, and preparing method and application thereof
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The technology of composite film and chitosan film is applied in the field of food materials, which can solve the problems of high price of glutaminase, uneven calcium alginate gel, unstable gel state, etc. Best taste and firmness retention
Active Publication Date: 2018-10-12
QINGDAO AGRI UNIV
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Although sodium alginate gel will form sodium alginate-calcium mixed salt gel when encountering a certain concentration of calcium and other divalent cations, but CaCl 2 The speed of cross-linking with sodium alginate solution is fast and very difficult to control, the prepared calcium alginate gel is not uniform, and Ca 2+ Will be with Na + exchange, leading to instability of the gel state
In addition, in the prior art, the edible composite packaging film is prepared by improving the mechanical strength and water resistance of the composite film through the molecular modification of chitosan and the enzymatic synergy of transglutaminase (TGase), although the film has Good mechanical properties, but expensive transglutaminase makes it cost-prohibitive
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[0055] A preparation method for an edible composite film, comprising the following steps:
[0056] Step 1: Prepare chitosan film solution: add chitosan to acetic acid solution, add plasticizer and mix well, then add oxidized ferulic acid, continue to add active substances, mix and stir to obtain chitosan film liquid;
[0057] Step 2: Prepare sodium alginate membrane solution: take sodium alginate and add it to deionized water, continue to add plasticizer, mix and stir to obtain sodium alginate membrane solution;
[0058] Step 3: Preparation of edible composite film: adopt layer-by-layer self-assembly method, take sodium alginate film solution and apply it to a plexiglass plate to form a film, form a sodium alginate film after drying, and take chitosan film solution to coat onto the sodium alginate film, and an edible composite film is obtained after drying.
[0059] Chitosan is known as the only naturally occurring polycationic biopolysaccharide, and the -NH on its molecule ...
Embodiment 1
[0074] Embodiment 1: a kind of preparation method of edible composite film, comprises the following steps:
[0075] Step 1: Prepare chitosan film solution: add chitosan to acetic acid solution, stir for 12 hours, add glycerin and mix to obtain chitosan solution, take 20 mg of ferulic acid to 30 mL of 4% concentration of H 2 o 2 Oxidation, freeze-drying and adding to the chitosan solution, continue to add the oxidized ferulic acid and chitosan, mix under the action of a magnetic stirrer, react at room temperature for 30min, and obtain the chitosan film liquid; wherein The mass concentration of citric acid in the chitosan film liquid is 0.2%, the mass concentration of chitosan in the chitosan film liquid is 2%, the addition of the ferulic acid is chitosan quality 1%, the mass concentration of glycerol described in the chitosan membrane liquid are respectively 0.5%;
[0076] Step 2: Prepare sodium alginate membrane solution: take sodium alginate and add it to deionized water, c...
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Abstract
The invention provides an edible composite film, and a preparing method and application thereof. The edible composite film comprises the following steps that 1, a chitosan film solution is prepared, specifically, chitosan is taken to be added into an acetum, a plasticizer is added, after even mixing, oxidized ferulic acid is added, active substances continue to be added, and the chitosan film solution is obtained after mixing and stirring; 2, a sodium alga acid film solution is prepared, specifically, sodium alga acid is taken to be added into deionized water, the plasticizer continues to be added, and the sodium alga acid film solution is obtained after mixing and stirring; and 3, the edible composite film is prepared through a layer-by-layer self-assembly method. The edible composite film adopts combination of a ferulic acid crosslinking method and the layer-by-layer self-assembly method, the composite film prepared through the methods is smooth and uniform in film surface and fine and smooth in section, the water resistance is improved remarkably, meanwhile, a preservative film prepared by a composite method is softer, ductility is enhanced, brittleness is greatly reduced, the preservation effect is the best, the fruit firmness can be maintained best, and the contents of nutrient substances such as VC, organic acid and SSC are maintained.
Description
technical field [0001] The invention belongs to the technical field of food materials, and in particular relates to an edible composite film and its preparation method and application. Background technique [0002] In recent years, my country's fruit and vegetable production industry has developed rapidly, and the supply of many fruit and vegetable products is relatively surplus, and the post-harvest loss rate caused by fruit and vegetable rot is increasing year by year. At the same time, with the improvement of living standards, people have higher and higher requirements for the freshness and nutritional value of fruits and vegetables. Therefore, a safe, efficient, environmentally friendly and low-cost fresh-keeping method is the key to the industrialized production of fruits and vegetables in my country and the expansion of the consumer market. [0003] After picking, fruits and vegetables are still a living organism. The respiration heat generated during storage will inc...
Claims
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