Metalloporphyrin/agarose freshness indicating label and preparation method thereof

A technology of metalloporphyrin and agarose, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problem of poor film-forming performance, poor accuracy, and sensitivity of porphyrin molecules. Low-level problems, to achieve the effect of simple and novel preparation method, good film-forming performance, and high sensitivity of acid-base detection

Pending Publication Date: 2020-05-22
JINGCHU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a metalloporphyrin for the problems of low sensitivity and poor accuracy of the indicator label based on the existing pH indicator in the above-mentioned prior art and the poor film-forming performance of the porphyrin molecule itself. / Agarose freshness indicator label, using the acid-base detection sensitivity of porphyrin molecules, combined with the good film-forming performance of agarose gel, the prepared metalloporphyrin / agarose freshness indicator label can be simple and fast , Conveniently indicate the spoilage of meat products

Method used

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  • Metalloporphyrin/agarose freshness indicating label and preparation method thereof
  • Metalloporphyrin/agarose freshness indicating label and preparation method thereof
  • Metalloporphyrin/agarose freshness indicating label and preparation method thereof

Examples

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preparation example Construction

[0029] The present invention also provides a method for preparing a metalloporphyrin / agarose freshness indicator label, comprising the following steps:

[0030] 1) Add agarose into pure water, heat and stir until completely dissolved, and obtain a colorless and transparent agarose gel-like liquid with a concentration of 5g / L-20g / L;

[0031] 2) Add metalloporphyrin chromogen and plasticizer to the agarose jelly liquid prepared in step 1), ultrasonically treat at 45°C-80°C until mixed evenly, then add hydrochloric acid to adjust the pH value to 5 ~6, to obtain a green and transparent mixed solution;

[0032] 3) Put the mixture obtained above in a petri dish, dry at a temperature of 20°C to 60°C for 12h to 48h, and obtain the metal (4-sodium sulfonate) phenylporphyrin / agarose freshness indicator label after cooling , the depth of the petri dish used is 5-20 mm, and the metalloporphyrin / agarose freshness indicator label with a thickness of 1-4 mm is formed after the mixed solutio...

Embodiment 1

[0037]Take 1.86g of agarose and add it to 200mL of pure water, heat and stir until completely dissolved to obtain a transparent agarose jelly liquid with a concentration of 9.3g / L; -sodium sulfonate) phenyl cobalt porphyrin and 0.1mL plasticizer-glycerin (about 0.13g) were added to the above-mentioned agarose jelly liquid, ultrasonically treated at 50°C until uniformly mixed, and then a small amount of 0.1 mol / L~1mol / L hydrochloric acid to adjust the pH value to 6 to obtain a green and transparent mixed solution; take some of the above mixed solution and place it in a petri dish with a depth of 10mm, and cure it at 60°C for 24 hours to obtain a thickness Tetrakis(4-sodiumsulfonate)phenylcobalt porphyrin / agarose freshness indicator label about 1mm.

[0038] The specific preparation process of Examples 2~7, Comparative Example 1 and Comparative Example 2 are as follows with the different conditions of Example 1, and others are the same, as shown in the following table:

[0039]...

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Abstract

The invention relates to the field of intelligent food packaging, and particularly relates to a metalloporphyrin / agarose freshness indicating label and a preparation method thereof. According to the freshness indicating label, agarose gel is used as a base material, the agarose gel comprises a metalloporphyrin color developing agent and a plasticizer which are uniformly dispersed in the agarose gel, the acid-base detection sensitivity of porphyrin molecules is high, and in combination with the good film-forming performance of the agarose gel, the prepared metalloporphyrin / agarose freshness indicating label can simply, rapidly and conveniently indicate the decay condition of meat products, and meanwhile the preparation method is simple, novel, low in cost, good in response performance, andhas wide application prospects.

Description

technical field [0001] The invention relates to the field of food intelligent packaging, in particular to a metalloporphyrin / agarose freshness indicator label and a preparation method thereof. Background technique [0002] Recently, due to the impact of African swine fever, a large number of pigs in domestic farms have been infected and died, resulting in a sharp drop in the production of pigs, and the price of domestic pork has skyrocketed. Shrimp and other price increases. To solve this problem, a large amount of frozen pork has entered the market to alleviate the shortage of fresh pork. However, when consumers choose meat products, the freshness of the meat has become an important consideration. [0003] Meat products are rich in nitrogen-containing protein. When the meat product is spoiled, bacteria decompose the protein and produce a large amount of nitrogen-containing alkaline gas. By measuring the content of alkaline gas, the freshness of the meat product can be ind...

Claims

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Application Information

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IPC IPC(8): G01N21/80
CPCG01N21/80
Inventor 陈良哲陈露江欣怡贾丹丹刘彦妤施亭张强
Owner JINGCHU UNIV OF TECH
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