Preparation method and application of intelligent label for judging critical freshness of pork
A smart label and freshness technology, which is applied in the direction of analyzing materials through chemical reactions, and analyzing materials through observation of the impact on chemical indicators, etc., to achieve the effects of simple production process, reliable results and high safety
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Embodiment 1
[0023] Example 1 A method of judging the critical freshness of a smart packaging with an intelligent display of pork freshness combined with an electronic tongue
[0024] The preparation process of the smart label: dissolve 1%~4% (w / v) polyethylene glycol-6000 in distilled water, add 1%~3% (w / v) methyl cellulose when the water bath is heated to 70°C, Stir continuously to form a uniform gel solution; under stirring conditions, add 2% (w / v) anthocyanin solution (to make the final concentration of anthocyanin 0.5% (w / v)); use 0.4mol / L of NaOH or 0.4mol / L of H 2 SO 4 Adjust the pH of the above mixed solution to 2.5; after eliminating the bubbles in the solution, cast it on a glass plate, dry it with hot air at 40°C and peel off the film, which is the indicator layer; wrap the indicator layer tightly with low-density polyethylene film.
[0025] How to use the smart label: As a smart label for the package, it is pasted inside the package and used without direct contact with the p...
Embodiment 2
[0027] Example 2 A method of judging the critical freshness of a smart label combined with an electronic tongue for non-destructive detection of pork freshness
[0028] The preparation process of the smart label: dissolve 1%~4% (w / v) polyethylene glycol-6000 in distilled water, add 1%~3% (w / v) methyl cellulose when the water bath is heated to 70°C, Stir continuously to form a uniform gel solution; under stirring conditions, add 3% (w / v) anthocyanin solution (to make the final concentration of anthocyanin 0.8% (w / v)); use 0.4 mol / L of NaOH or 0.4 mol / L of H 2 SO 4 Adjust the pH of the above mixed solution to 4; after eliminating the bubbles in the solution, cast it on a glass plate, dry it with hot air at 40°C and peel off the film, which is the indicator layer; wrap the indicator layer tightly with a low-density polyethylene film.
[0029] How to use the smart label: As a smart label for rapid detection of pork freshness, take a certain amount of pork and put it into a seal...
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