Full history time-temperature indicator system

A temperature indicator, time technology, applied in the direction of testing time/temperature history, thermometer, device for measuring time interval, etc., can solve the problem of time-temperature indicator not providing direct measurement of time-temperature history process, etc.

Inactive Publication Date: 2003-01-08
TIMETEMP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Partial process time-temperature indicators as described above do not provide a direct measurement of the time-temperature history

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Preparation of Movable and Immobilized Reactants

[0042] The mobile reactant is 0.1M K in a mixture of 0.64% (w / w) alginate, 47.29% (w / w) glycerol, 52.06% (w / w) water 4 Fe(CN) 6 solution.

[0043] The immobilized reactants were prepared by dissolving 0.1M FeCl in a mixture of 47% (w / w) glycerol and 53% (w / w) water 3 The solution was slowly added to a mixture of 0.64% (w / w) alginate, 47.29% (w / w) glycerol, 52.06% (w / w) water. 0.1M FeCl 3 The amount of solution used was 17% (w / w) of the final weight. Mixing was accomplished by stirring vigorously at room temperature. In this way a viscous liquid is obtained which contains fixed Fe 3+ The small gel clusters are evenly distributed.

example 2

[0045] Time-temperature indicator prepared in ampoules

[0046] For the preparation of the ampoule-shaped time-temperature indicator, two transparent cylinders made of polyethylene are used, each of which is closed at one of its ends. The outer diameter of one of the cylinders (No. 1) is equal to the inner diameter of the No. 2 cylinder, so it fits into the other cylinder (No. 2).

[0047] Movable reactants were prepared according to the method described in Example 1 and contained K at a concentration of 0.1M 4 Fe(CN) 6 . The movable reactant is transferred to the No. 1 cylinder.

[0048] The method described in Example 1 is used to prepare the Fe-containing gel immobilized in the alginate gel. 3+ The immobilized reactants of the ions are then sent to the No. 2 cylinder.

[0049] The chemical reaction begins by assembling by gently pressing the two cylinders together, being careful to avoid the formation of air bubbles.

[0050] A time-temperature indicator was incubat...

example 3

[0052] In a ribbon time-temperature indicator, the color display is the time at 4°C The function

[0053] A time-temperature indicator was prepared as a strip wherein the reactants were prepared as described in Example 1 above.

[0054] For those containing fixed Fe 3+ The band-like time-temperature indicator displays the color of the portion being monitored. Color development was measured as the length of the dark blue region as a percentage of the total length of the portion of the time-temperature indicator containing the immobilized reactants. The time-temperature indicator maintains a constant temperature of 4°C for 76 days.

[0055] The results of the above experiments are shown in Table 3.1 below.

[0056] number of days

[0057] From the above results it is evident that the time-temperature indicator responds well to the exposure time at constant temperature.

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PUM

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Abstract

A full-history time-temperature indicator system which is capable of exhibiting a time-temperature dependent and visually detectable chemical reaction, useful for monitoring the time and temperature exposure of food products. The system comprises an immobilised reactant, such as Fe<3+>, and a mobile reactant, such as Fe(CN)6<4->, initially contained in separate compartments, and separated by a sealing. The system is activated by removing a sealing between the compartments whereby the mobile reactant in a time-temperature dependent manner is brought into contact with the immobilised reactant resulting in a visually detectable reaction signal.

Description

technical field [0001] The present invention provides a time-temperature indicator system for monitoring environmental exposure of various products that undergo progressive quality changes during exposure. In particular, a full time-temperature indicator system is provided for the cumulative monitoring of time and temperature exposure of particularly perishable products. Background technique [0002] The quality of food and other perishable products is highly dependent on storage conditions such as temperature and storage time during the period from production or packaging until it finally reaches the final consumer. As the temperature increases, the deterioration process is accelerated due to the increased rate of biochemical reactions, so the quality of perishable goods deteriorates faster at high temperatures than at low temperatures. [0003] Examples of perishable products that require storage without exceeding certain temperature limits, or at least for a predetermine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/12C09K9/00G01K3/04G01N31/00G01N31/02G01N31/22G04F1/00
CPCG01K3/04G01N31/229
Inventor 珀·O·斯科杰尔沃尔德布里特·萨尔布彼得·H·赫耶尔达尔赫尔治·里恩
Owner TIMETEMP
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