PH-sensitive freshness detection intelligent label, preparation method and application thereof

A smart label and freshness technology, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators, etc., can solve the problems of time-consuming and laborious, difficult to meet the freshness quick inspection, and achieve Guaranteed quality and safety, the effect of a wide range of sources

Inactive Publication Date: 2020-04-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional freshness detection method has the disadvantage of time-consumin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 2.0g of polyvinyl alcohol and add it to 100mL of distilled water, and stir rapidly in a 75°C water bath for 30min until the polyvinyl alcohol is completely dissolved. After the polyvinyl alcohol solution was cooled to room temperature, 2.0 g of methylcellulose was added while stirring slowly, and stirred at room temperature for 2 hours to obtain a polyvinyl alcohol / methylcellulose solution.

[0029] Dissolve bromocresol violet and methyl red powders in absolute ethanol at a ratio of 1:200 to obtain an indicator solution with a concentration of 5 g / L.

[0030] Add 4 mL of an indicator solution with a volume ratio of bromocresol violet to methyl red of 1:2 into the polyvinyl alcohol / methylcellulose solution, and continue stirring for 1 h to obtain a film-forming solution with an indicator concentration of 40 mL / L. Put the above composite solution in an ultrasonic cleaner, set the power to 50W, and work for 20 minutes to remove air bubbles. Take 20mL of compound solu...

Embodiment 2

[0033] Take 2.0g of polyvinyl alcohol and add it into 100mL of distilled water, and stir rapidly in a 75°C water bath for 30min until the polyvinyl alcohol is completely dissolved. After the polyvinyl alcohol solution was cooled to room temperature, 2.0 g of methylcellulose was added while stirring slowly, and stirred at room temperature for 2 hours to obtain a polyvinyl alcohol / methylcellulose solution.

[0034] Dissolve bromocresol violet and methyl red powders in absolute ethanol at a ratio of 1:200 to obtain an indicator solution with a concentration of 5 g / L.

[0035] Add 4 mL of an indicator solution with a volume ratio of bromocresol violet to methyl red of 2:3 into the polyvinyl alcohol / methylcellulose solution, and continue stirring for 1 h to obtain a film-forming solution with an indicator concentration of 40 mL / L. Put the above composite solution in an ultrasonic cleaner, set the power to 50W, and work for 20 minutes to remove air bubbles. Take 20mL of compound so...

Embodiment 3

[0038] Take 2.0g of polyvinyl alcohol and add it into 100mL of distilled water, and stir rapidly in a 75°C water bath for 30min until the polyvinyl alcohol is completely dissolved. After the polyvinyl alcohol solution was cooled to room temperature, 2.0 g of methylcellulose was added while stirring slowly, and stirred at room temperature for 2 hours to obtain a polyvinyl alcohol / methylcellulose solution.

[0039] Dissolve bromocresol violet and methyl red powders in absolute ethanol at a ratio of 1:200 to obtain an indicator solution with a concentration of 5 g / L.

[0040] Add 4 mL of an indicator solution with a volume ratio of bromocresol violet to methyl red of 1:1 into the polyvinyl alcohol / methylcellulose solution, and continue stirring for 1 h to obtain a film-forming solution with an indicator concentration of 40 mL / L. Put the above composite solution in an ultrasonic cleaner, set the power to 50W, and work for 20 minutes to remove air bubbles. Take 20mL of compound so...

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Abstract

The invention discloses a pH sensitive freshness detection intelligent label, and a preparation method and application thereof, and belongs to the field of intelligent food packaging, the pH sensitivefreshness detection intelligent label takes bromcresol purple/methyl red as a color developing agent, and polyvinyl alcohol/methyl cellulose as a film forming base material; the polyvinyl alcohol andthe methyl cellulose are wide in source, safe and degradable; bromcresol purple and methyl red are used as common pH indicators and can respond to different pH values. Therefore, the prepared bromcresol purple/methyl red composite pH sensitive intelligent label can be used for accurately monitoring and detecting the freshness of food materials such as livestock and poultry, aquatic products and the like in real time so as to ensure the quality safety of food.

Description

technical field [0001] The invention relates to the field of food intelligent packaging, in particular to a pH-sensitive freshness detection intelligent label, a preparation method and an application thereof. Background technique [0002] With the improvement of the quality of life and the enhancement of public health awareness, food safety has gradually become a hot topic. As an important indicator for judging the edibility and safety of products, freshness affects the health of consumers and determines consumers' willingness to purchase. Food materials such as livestock, poultry, and aquatic products are susceptible to corruption and deterioration due to the influence of the environment and itself during storage and transportation, which in turn endangers human health. Therefore, testing the freshness of food and visually presenting the results to consumers can play a vital guiding role in guiding their consumption. At present, the traditional freshness detection method ...

Claims

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Application Information

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IPC IPC(8): G01N21/80
CPCG01N21/80
Inventor 胡亚芹黄佳茵陈士国叶兴乾陈健初
Owner ZHEJIANG UNIV
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