Low molecular weight chitosan colorant modified with acid-base responsive phenol red dye for use as a quality indicator material in smart packaging and manufacturing processes.

Abstract

Preparation of colorants from low molecular weight chitosan modified with phenol red dye. (Phenol red) using formaldehyde as a crosslinking agent through a condensation reaction. (Condensation reaction) The production process begins with preparing a low molecular weight chitosan solution. Add the nolled solution, then add formaldehyde. Stir the mixture and heat it. Adjust the parameters. pH the solution with a basic solution until it is neutral. Precipitate the precipitate in ethanol. Dissolve the precipitate and... The impurities are precipitated in ethanol, then the precipitate is washed and filtered using a pressure reducing filter, and then dried. In an oven, the product is dried to obtain a polymeric dye with the necessary capabilities. In response to acid-base conditions, it serves as a quality indicator material for smart packaging, and is a component of [the product]. Printing inks possess acid-base responsive properties in water-based inks for printing materials or labels. Brilliant, and to solve the problem of leakage of synthetic coloring agents which are small molecules and easily broken down. Migration or leaching from printed material may pose a danger to consumers. The screened pieces can show a response to pH and ammonia vapor even at low concentrations. This is based on changes in the color shade of the workpiece that correspond to the concentration of alkaline vapor generated in the system. Furthermore, the piece exhibits resistance to washing with simulated food solutions, thus demonstrating its safety. For consumer use.

Claims

OCR 09WP 03 / 07 / 2569 1. Low molecular weight chitosan dye modified with acid-base responsive phenol red dye for... It is a quality indicator material on smart packaging that consists of the following ingredients: Low molecular weight chitosan, phenol red. Formaldehyde (formaldehyde) molar ratio between low molecular weight chitosan to phenol red to... Formaldehyde levels range from 1:0.5:0.1 to 1:2:

2.

2. Low molecular weight chitosan dye modified with acid-base responsive phenol red dye for... It is a quality indicator material on smart packaging, according to claim 1, where the molar ratio between chitosan... The optimal ratio of low molecular weight phenol red to formaldehyde is 1:1:

2.

3. Low molecular weight chitosan dye modified with acid-base responsive phenol red dye for... It is a quality indicator material on smart packaging, pursuant to claim 1 or 2, where chitosan has a specific molecular weight. In the range of 5,000–190,000 daltons.

4. Low molecular weight chitosan dye modified with acid-base responsive phenol red dye for... It is a quality indicator material on smart packaging, pursuant to any one of claims 1 through 3, where chitosan of a certain weight... The optimal molecular strength is in the range of 5,000-30,000 Daltons.

5. A process for producing a low molecular weight chitosan dye modified with phenol red that responds to values... Acid-base materials for use as quality indicators on smart packaging, exhibiting characteristics as described in any one of claims 1 through 4. It consists of the following steps: (a) Prepare low molecular weight chitosan solutions with concentrations of 0.5-3.0 percent by Weight by volume, dissolved in water containing 1 percent acetic acid by weight. volume (b) Prepare the phenol red solution by dissolving it in a polar solvent, namely methanol. (Methanol), Ethanol, Acetone, Dimethylformamide formamide) (c) Add phenol red solution to the low molecular weight chitosan solution, then add formaldehyde. Add the hydroxyaminated solution to the above mixture while stirring the solution and heating it to the specified temperature. 40-80 degrees Celsius for 8-24 hours. (d) Adjust the pH with a base solution, sodium hydroxide, until the solution is neutral (pH 7). (c) Precipitate in ethanol. (c) Dissolve and precipitate the precipitate in ethanol, then wash the precipitate with 70% ethanol. Percentage by volume (c) Filter the sediment using a pressure reducing filter and dry in an oven at 60 degrees Celsius until... Dry products 6. A process for producing a low molecular weight chitosan dye modified with phenol red that responds to values... Acid-base indicators for quality assurance on smart packaging, as per claim 5, where concentration... The optimal concentration of low molecular weight chitosan solution is 1 percent by weight.

7. A process for producing a low molecular weight chitosan dye modified with phenol red that responds to values... Acid-base indicator materials for quality indication on smart packaging, exhibiting characteristics as described in either claim 5 or 6. One suitable polar solvent for dissolving phenol red is dimethylformamide.

8. A process for producing a low molecular weight chitosan dye modified with phenol red that responds to values... Acid-base materials for use as quality indicators on smart packaging, exhibiting characteristics as described in any one of claims 5 through 7. Where the optimal temperature of 60 degrees Celsius for 24 hours is found.

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