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Discoloration indicator for shelf life of perishable product and preparation method thereof

An indicator and perishable technology, applied in the field of color-changing indicator technology and related materials, can solve the problems of difficult to completely cover, high cost, public health and safety threats, etc., and achieve the effect of safe preparation process and low cost

Active Publication Date: 2012-10-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the product inevitably undergoes temperature changes during transportation, storage, and sales, and temperature is one of the important factors affecting product quality, the shelf life marked on the product packaging at this stage does not have sufficient credibility. A problem that may pose a huge threat to public health and safety
[0003] At present, some technologies have been devoted to solving this problem, such as using a data logger (Datalogger) to track and record the temperature changes experienced by the product, but these technologies are often costly and difficult to fully cover the product "from producer to consumer". ", and it is difficult for consumers to intuitively read the information recorded in it

Method used

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  • Discoloration indicator for shelf life of perishable product and preparation method thereof
  • Discoloration indicator for shelf life of perishable product and preparation method thereof
  • Discoloration indicator for shelf life of perishable product and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] Silver nitrate solution (0.1M, 30μL) was added to CTAC solution (0.08M, 1mL), followed by AA solution (1M, 3mL), gold nanorod solution (1mL, the maximum extinction peak was 870nm, and the optical density was 3cm -1 ), sodium acetate solution (0.1M, 50 μL). Place the mixed solution in a 30°C incubator, such as figure 1 As shown, the extinction spectrum of the solution changes, the maximum extinction peak gradually shifts to blue, and the solution changes from red to green within 1 hour.

Embodiment 2

[0044] Silver nitrate solution (0.1M, 30 μL) was added to CTAC solution (0.08M, 1mL), followed by AA solution (0.1M, 3mL), gold nanorod solution (1mL, the maximum extinction peak position was 870nm, and the optical density was 3cm -1 ), acetic acid solution (0.1M, 50 μL). Place the mixed solution in a 30°C incubator, such as figure 2 As shown, the extinction spectrum of the solution changes, the maximum extinction peak gradually shifts to blue, and the solution changes from red to green within 24 hours.

Embodiment 3

[0046] Silver nitrate solution (0.1M, 30 μL) was added to CTAC solution (0.08M, 1mL), followed by ascorbic acid solution (0.1M, 3mL), gold nanorod solution (1mL, the maximum extinction peak position was 870nm, and the optical density was 3cm -1 ), acetic acid solution (0.1M, 5mL). Place the mixed solution in a 30°C incubator, such as image 3 As shown, the extinction spectrum of the solution changes, the maximum extinction peak gradually shifts to blue, and the solution changes from red to green within 720 hours.

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Abstract

The invention provides a discoloration indicator for shelf life of a perishable product and a preparation method thereof. The preparation method comprises the following steps: 1) preparing a surfactant aqueous solution containing chloride or bromide ions, a soluble ascorbate aqueous solution, a soluble weak acid or weak acid salt aqueous solution and a soluble silver salt solution, wherein concentration of each of the four aqueous solutions is not less than 0.1 mM; and 2) mixing gold nanorod with a largest extinction wavelength not less than 700nm with the four solutions in the step 1) to obtain the indicator, and conducting a metachromatism. During mixing, concentration of gold nanorod in the indicator needs to be adjusted to realize an optical density of the solution no less than 0.1cm<-1> at 500-520nm; usage amount of soluble silver salt in the indicator is no less than 4 times an amount of substance of gold in the gold nanorod solution matter; and usage amount of other reagent is adjusted according to shelf life of an indicating object. According to the invention, discoloration process of the perishable product with change of temperature is tracked and recorded to simulate a metamorphic process of the product to be indicated, and quality and shelf life of the product are visually indicated through the color.

Description

technical field [0001] The application of the present invention relates to a color-changing indicating technology and related materials, in particular to a color-changing material used to indicate the shelf life of perishable products and related technologies. Background technique [0002] Food, beverages, medical drugs, etc. are perishable products (Perishable Goods), because they are easily deteriorated by factors such as microbial reproduction, active ingredient decomposition or oxidation, so the shelf life must be marked on the product packaging. In most cases, the shelf life marked on the product package is when "the product is kept under proper conditions (such as proper temperature, proper atmosphere, no damage to the package, and no pollution to the product, etc.) during transportation, storage, and sales" estimated on this basis. Since the product inevitably undergoes temperature changes during transportation, storage, and sales, and temperature is one of the impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22
Inventor 严纯华张超孙聆东王建方陈兴
Owner PEKING UNIV
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