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Diffusible time-temperature indicator, indicator card and preparation method of the indicator card

A diffusion-type, indicator technology, applied in thermometers, thermometers with physical/chemical changes, measuring devices, etc., to achieve simple manufacturing process, convenient operation, and good color rendering effect

Inactive Publication Date: 2010-06-02
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application number: 200310109212.5 discloses a shelf life indicator card for diffused low-temperature circulation items, which uses a monomeric compound as a temperature and time indicator, and the critical temperature of the indicator is fixed. It is used in different types of frozen foods. Larger limitations

Method used

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  • Diffusible time-temperature indicator, indicator card and preparation method of the indicator card
  • Diffusible time-temperature indicator, indicator card and preparation method of the indicator card
  • Diffusible time-temperature indicator, indicator card and preparation method of the indicator card

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Effect test

Embodiment 1

[0025] The diffusion type time-temperature indicator card of the present embodiment is made by the following method:

[0026] Take methyl salicylate and γ-caprolactone at a volume ratio of 40:1, add colorant Sudan IV and mix in a speed mixer at a speed of 3000r / min for 1 to 3 minutes to obtain an indicator; take 100 μL of the indicator Put it in a centrifuge test tube and place it at -80°C to make it solidify; put the diffusion medium and the solidified indicator into the corresponding groove on the substrate, and make one end of the diffusion medium extend into the bottom of the groove to contact the indicator. Then seal it with a sealing film to obtain a time-temperature indicator card. The diffusion medium is a silica gel sheet with a specification of 10×0.7 cm. The critical temperature of the time-temperature indicator card of this embodiment is -3 ℃, and the diffusion rate under this temperature is 2.78×10 -3 cm / min, this indicator card is used to monitor the ambient tem...

Embodiment 2

[0028] The diffusion type time-temperature indicator card of the present embodiment is made by the following method:

[0029] Take methyl salicylate and γ-caprolactone at a volume ratio of 40:3, add colorant Sudan IV and mix in a speed mixer at a speed of 3000r / min for 1 to 3 minutes to obtain an indicator; take 100 μL of the indicator Put it in a centrifuge test tube and place it at -80°C to make it solidify; put the diffusion medium and the solidified indicator into the corresponding groove on the substrate, and make one end of the diffusion medium extend into the bottom of the groove to contact the indicator. Then seal it with a sealing film to obtain an indicator card. The diffusion medium is a thin-layer plate with a specification of 10×0.7cm. The critical temperature of the time-temperature indicating card of this embodiment is -10 ℃, and the diffusion rate under this temperature is 3.17×10 -3 cm / min. The time-temperature indicator card of this embodiment spreads 9.13c...

Embodiment 3

[0031] The diffusion type time-temperature indicator card of the present embodiment is made by the following method:

[0032] Take methyl salicylate and γ-caprolactone at a volume ratio of 40:5, add the colorant Sudan IV and mix in a speed mixer at a speed of 3000r / min for 1 to 3 minutes to obtain an indicator; take 100 μL of the indicator Put it in a centrifuge test tube and place it at -80°C to make it solidify; put the diffusion medium and the solidified indicator into the corresponding groove on the substrate, and make one end of the diffusion medium extend into the bottom of the groove to contact the indicator. Then seal it with a sealing film to obtain an indicator card. The diffusion medium is a thin-layer plate with a specification of 10×0.7cm. The critical temperature of the time-temperature indicating card of this embodiment is -15 ℃, and the diffusion rate under this temperature is 1.61×10 -3 cm / min, the indicator card is used to monitor the temperature of the cold...

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Abstract

The invention discloses a diffusible time-temperature indicator, an indicator card and a preparation method thereof, wherein the time-temperature indicator consists of methyl salicylate, gamma-caprolactone and a coloring agent, and the volume ratio of the methyl salicylate to the gamma-caprolactone is 40: (1-5). The time-temperature indicator card adopts the mixture of the methyl salicylate and the gamma-caprolactone as a diffusible substance, the coloring agent is further added, the indicator is prepared by fully mixing, then the solidified state is formed by ultra-low temperature processing, and the solidified indicator is in contact with the diffusible medium for preparing the indicator card. The time-temperature indicator card can change the mixing ratio of the methyl salicylate and the gamma-caprolactone, realize the regulation of the critical temperature of the indicator, be applicable to the needs of different frozen foods and have a wide range of applications.

Description

technical field [0001] The invention relates to a diffusion type time-temperature indicator card, and also relates to a time-temperature indicator card using the indicator and a preparation method thereof. Background technique [0002] The quality of frozen and refrigerated food is not only affected by internal factors such as its own composition, but also affected by external environmental conditions such as atmospheric pressure, mechanical pressure, light, and temperature, and quality and safety issues are often affected by the production, storage, transportation or shelf life of quick-frozen prepared foods. Therefore, controlling the external environment is a very important link. Among all external environmental factors, temperature fluctuations in the circulation link are the main factors that cause product quality to decline. Improper temperature control in the storage environment will cause food spoilage and cause economic losses. The temperature requirements of the ...

Claims

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Application Information

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IPC IPC(8): G01K11/16
Inventor 艾志录潘治利谢新华李镁娟王娜李建新孙晓瑞
Owner HENAN AGRICULTURAL UNIVERSITY
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