Edible protein/polysaccharide composite membrane and preparation method and application thereof
A polysaccharide compounding and protein technology, which is applied in the biological field of the food industry, can solve the problems of membrane mechanical properties, water blocking properties and stability that need to be improved.
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Embodiment 1
[0035] Example 1: Preparation process of protein-polysaccharide composite membrane
[0036] (1) any protein in soybean protein, whey protein, sodium caseinate, weigh 10g and dissolve it in 90 grams of pure water under the action of a magnetic stirrer to obtain three kinds of protein with a mass percentage of 10%. Protein solution: Weigh 2g of Curdlan powder and dissolve it in 90g of pure water. After Curdlan is fully swollen, slowly add 1g of NaOH or 1.4g of KOH under the action of a magnetic stirrer, and make up to 100g with pure water to make a mass The percentage content is 2% Curdlan solution; 5g CMCH is weighed and dissolved in 95 grams of pure water under the action of a magnetic stirrer to make a 5% CMCH solution by mass percentage;
[0037] (2) Take 44.5g protein solution, 40g Curdlan solution, and 15g CMCH solution and mix slowly, slowly add 2.5mol / L citric acid dropwise to adjust the pH value of the mixture, and add 0.5g glycerol. During the dropwise addition of the...
Embodiment 2
[0042] Embodiment 2: Method for measuring the properties of protein-polysaccharide edible film
[0043] (1) Mechanical properties
[0044] The film was cut into strips of 8cm*2cm, and fixed on a physical property analyzer for measurement. Set the initial distance between the two fixtures of the physical property meter to 80mm, and the speed to 0.8mm / sec. After the measurement, record the force (g) at the instant the film breaks and the distance L between the two clamps when the film breaks. For each sample, five parallel samples were taken for determination.
[0045] Tensile strength TS (g) is calculated according to the following formula:
[0046] TS=Fm / d*W
[0047] Where: TS—tensile strength, (MPa);
[0048] Fm—the maximum tension that the sample bears when it breaks, (N);
[0049] d—film thickness, (m);
[0050] W—film width, (m).
[0051] The elongation at break E (%) is calculated according to the following formula:
[0052] E=(L 1 - L 0 ) / L 0
[0053] In the...
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