PH colorimetric sensing film as well as preparation method and application thereof
A sensing film and colorimetric technology, which is applied in the field of pH colorimetric sensing film and preparation, can solve the problems of high technical requirements for experimenters, time-consuming and labor-consuming, complicated operation, etc., and achieve wide source of raw materials, convenient use, good The effect of antimicrobial properties
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Embodiment 1
[0040] The present embodiment is the preparation method of traditional pure gelatin film, comprises the steps:
[0041] (1) Preparation of pure gelatin film-forming solution: weigh 0.4g gelatin, add it to 10mL ultrapure water, stir magnetically in a constant temperature water bath at 45°C until the gelatin is completely dissolved, add 0.1g glycerin as a plasticizer, Continue to stir the above film-forming solution in a constant temperature water bath until the mixture is uniform, and obtain a uniform pure gelatin film-forming solution after ultrasonic degassing for 15 min.
[0042] (2) Preparation of pure gelatin film: Measure 10mL of the film-forming solution, pour and spread it into a plexiglass film-forming mold (120mm×80mm×4mm), the film-forming temperature is 23±0.5°C, and the humidity is 50±3%. The film-forming time is 24-48h, and then peel off manually to obtain a pure gelatin film.
[0043] The surface of the prepared pure gelatin film has been measured by SEM, the re...
Embodiment 2
[0048] The present embodiment is the preparation method of pH colorimetric sensing membrane, comprises the following steps:
[0049] Step 1, preparation of alizarin solution: Weigh 30mg of alizarin in a 10mL test tube, add 5mL of ethanol to dissolve, then measure 1mL of alizarin ethanol solution, add it to 9mL of ultrapure aqueous solution, stir magnetically until uniform An alizarin solution with a concentration of 6 mg / mL was obtained.
[0050] Step 2, preparation of antibacterial solution: mix 0.5wt% gelatin nanoparticles with 8% lavender essential oil to obtain an antibacterial solution stabilized by gelatin nanoparticles.
[0051] Step 3, preparation of mixed solution: mix the alizarin solution obtained in step 1 with a concentration of 6 mg / mL and the antibacterial solution obtained in step 2 at a volume ratio of 1:1 to obtain a mixed solution.
[0052] Step 4, preparation of antibacterial film-forming solution: Weigh 0.4g of gelatin, add it to 10mL of the mixed solutio...
Embodiment 3
[0058] The present embodiment is the preparation method of pH colorimetric sensing membrane, comprises the following steps:
[0059] Step 1, preparation of alizarin solution: Weigh 20mg of alizarin in a 10mL test tube, add 5mL of ethanol to dissolve, then measure 1mL of alizarin ethanol solution, add it to 9mL of ultrapure aqueous solution, stir magnetically until uniform An alizarin solution with a concentration of 4 mg / mL was obtained.
[0060] Step 2, the preparation of the antibacterial solution is consistent with Step 2 of Example 2.
[0061] Step 3, preparation of the mixed solution: mix the alizarin solution obtained in step 1 with a concentration of 4 mg / mL and the antibacterial solution obtained in step 2 at a volume ratio of 1:1 to obtain a mixed solution.
[0062] Step 4, antibacterial film-forming solution The preparation of the film-forming solution is consistent with Step 4 of Example 2.
[0063] Step 5, the preparation of the pH colorimetric sensing film is co...
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