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A color indicator label for monitoring the oxidation degree of food and its preparation method

A technology of color indication and oxidation degree, which is applied in the field of food labeling, can solve the problems such as difficult timing and one-by-one detection, and achieve the effects of safe and harmless ingredients, simple and easy preparation method, and convenient use

Active Publication Date: 2021-11-02
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of detecting oxygen concentration requires specific instruments, and it is difficult to detect one by one regularly. Therefore, it is necessary to study a label that can have obvious color changes under different oxygen concentrations, so as to quickly judge the degree of oxidation of food

Method used

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  • A color indicator label for monitoring the oxidation degree of food and its preparation method
  • A color indicator label for monitoring the oxidation degree of food and its preparation method
  • A color indicator label for monitoring the oxidation degree of food and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A color indicator label for monitoring the oxidation degree of food is prepared by the following steps:

[0026] (1) Get 0.01g methylene blue, be dissolved in the ethanol aqueous solution of 65wt% in 1000g concentration, obtain methylene blue solution;

[0027] (2) Take 6 mL of the methylene blue solution (10 mg / L) obtained in step (1) in a 20 mL reagent bottle, add 0.48 g of zein, 6 mg of nano-titanium dioxide (average particle diameter 20 nm), and stir at 350 r / min for 30 Minutes to obtain the mixed solution;

[0028] (3) Add 0.048 g of glycerin dropwise to the mixed solution obtained in step (2), stir magnetically at room temperature for 30 minutes, mix evenly, put it in a constant temperature water bath at 30° C. and stir for 4 hours at a constant temperature, and then ultrasonically disperse for 30 minutes to obtain a film-forming solution;

[0029] (5) Pour the film-forming liquid into a stainless steel mold in a columnar shape, form a film by casting method, adj...

Embodiment 2

[0033] A color indicator label for monitoring the oxidation degree of food is prepared by the following steps:

[0034] (3) Get 0.02g methylene blue, be dissolved in 1000g concentration and be in the aqueous ethanol solution of 75%, obtain methylene blue solution;

[0035] (4) Take 6mL of the methylene blue solution obtained in step (1) in a 20mL reagent bottle, add 0.6g of zein, 0.018g of nano-titanium dioxide (average particle size 20nm), and stir for 30 minutes under magnetic stirring at 350r / min to obtain a mixed liquid;

[0036] (3) Add 0.12 g of glycerol dropwise to the mixture obtained in step (2), stir magnetically at room temperature for 30 minutes, mix well, put it in a constant temperature water bath at 40°C and stir for 2 hours at a constant temperature, and then ultrasonically disperse for 15 minutes to obtain a film-forming liquid;

[0037] (5) Pour the film-forming solution into a stainless steel mold in a columnar shape, form a film by tape casting, adjust the...

Embodiment 3

[0041] A color indicator label for monitoring the oxidation degree of food is prepared by the following steps:

[0042] (5) Get 0.03g methylene blue, be dissolved in 1000g concentration and be in the aqueous ethanol solution of 85%, obtain methylene blue solution;

[0043] (6) Take 6 mL of the methylene blue solution obtained in step (1) in a 20 mL reagent bottle, add 0.6 g of zein, 0.03 g of nano-titanium dioxide (average particle size 50 nm), and stir for 30 minutes under magnetic stirring at 350 r / min to obtain a mixed liquid;

[0044] (3) Add 0.18 g of glycerin dropwise to the mixture obtained in step (2), stir magnetically at room temperature for 30 minutes, mix well, put it in a constant temperature water bath at 50°C and stir for 2 hours at a constant temperature, and then ultrasonically disperse for 10 minutes to obtain a film-forming liquid;

[0045] (5) Pour the film-forming solution into a stainless steel mold in a columnar shape, form a film by casting method, adj...

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Abstract

The invention provides a color indicator label for monitoring the oxidation degree of food and a preparation method thereof. The color indicator label is obtained by making a label after forming a film from a film-forming liquid, and the film-forming liquid includes the following components in weight percentage: zein alcohol Soluble protein 7~13wt%, methylene blue 0.9×10 ‑3 ~4.5×10 ‑3 % by weight, 0.09-0.72% by weight of nano-titanium dioxide, 0.5-5% by weight of glycerin, 55-85% by weight of ethanol, and 4-35% by weight of deionized water. The label is green before exposure to UV light, fades to yellow after exposure to UV light, and gradually returns to green after encountering oxygen again, which helps people quickly judge the oxygen changes in various food packages.

Description

technical field [0001] The invention belongs to the technical field of food labeling, and in particular relates to a color indicating label for monitoring the oxidation degree of food and a preparation method thereof. Background technique [0002] With the gradual development of social economy and the gradual improvement of people's living standards, people are more and more concerned about the freshness and edible safety of various foods. As we all know, there are many factors that cause food spoilage, such as: biological factors (insects, parasites, microorganisms), chemical factors (enzymes in food tissues) and physical factors (light, storage temperature, water activity, oxygen concentration) and so on. For some foods rich in fat and vitamins, the oxygen in the packaging container can accelerate the oxidation and corruption of fatty acids (especially unsaturated fatty acids), and generate some aldehydes, ketones and low-molecular fatty acids with irritating or bitter tas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09F3/02G01N21/78
Inventor 郑华明高逸飞叶佩玲余佳慧李星宇刘港周明钰
Owner WUHAN INSTITUTE OF TECHNOLOGY