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Novel time-temperature and 'consume-within' indicator based on gas-diffusion.

A Mills1, D Hawthorne1, A Graham1

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A new time-temperature indicator label uses an ammonia-sensitive film that changes color based on temperature. This easily produced label provides a visual, temperature-dependent indication of time and temperature exposure.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Food Science

Background:

  • Accurate monitoring of time-temperature exposure is crucial for product quality and safety.
  • Existing time-temperature indicators (TTIs) have limitations in control and application.
  • Development of novel, easily manufactured TTIs is needed.

Purpose of the Study:

  • To develop and characterize a novel time-temperature indicator label.
  • To evaluate the temperature-dependent color reversion rate of the indicator film.
  • To assess the feasibility of large-scale production and storage.

Main Methods:

  • Fabrication of a TTI label by combining an ammonia-sensitive indicator film with an ammonia-generating adhesive layer.
  • Observation and quantification of the color change (blue to yellow) upon separation of the films.
  • Analysis of the rate of color reversion as a function of temperature.

Main Results:

  • The novel TTI label successfully demonstrates a color change from blue to yellow upon activation.
  • The rate of color reversion is controllable and exhibits a temperature-dependent behavior.
  • The labels are straightforward to manufacture and suitable for storage.

Conclusions:

  • The developed ammonia-sensitive TTI label offers a promising, easily produced method for monitoring time-temperature history.
  • The controllable, temperature-dependent color change provides a visual indicator of product exposure.
  • This technology has potential applications in various industries requiring temperature monitoring.