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Inkjet-printed O2 gas sensors in intelligent packaging.

M D Fernández-Ramos1,2, M Pageo-Cabrera1, L F Capitán-Vallvey1,2

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Summary
This summary is machine-generated.

A novel inkjet-printed colorimetric sensor detects oxygen in smart packaging using UVC-activated toluidine blue. This sensor provides a visual cue for modified atmosphere product degradation, enhancing food safety and quality.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Food Science

Background:

  • Smart packaging requires real-time indicators for product quality.
  • Modified atmosphere packaging (MAP) relies on controlled gas environments to prevent degradation.
  • Colorimetric sensors offer a visual, accessible method for monitoring environmental changes.

Purpose of the Study:

  • To develop an inkjet-printed colorimetric sensor for oxygen detection in smart packaging.
  • To assess the sensor's performance, stability, and response to environmental factors.
  • To demonstrate the sensor's practical application in monitoring packaged food products.

Main Methods:

  • Inkjet printing of a membrane incorporating toluidine blue, glycerol, and hydroxypropyl methylcellulose.
  • Photoreduction of toluidine blue using UVC light and SnO2 nanoparticle ink.
  • Colorimetric analysis of oxygen exposure using a digital camera.
  • Evaluation of sensor response under varying humidity and temperature conditions.

Main Results:

  • The sensor remained stable in the absence of oxygen.
  • High relative humidity (>60%) and temperature significantly affected the reoxidation process.
  • Refrigeration at 4°C enhanced sensor stability.
  • The sensor successfully indicated oxygen ingress in packaged ham over 48 hours.

Conclusions:

  • Inkjet-printed toluidine blue membranes serve as effective UVC-activated colorimetric oxygen sensors.
  • The sensor's functionality is influenced by humidity and temperature, requiring controlled conditions for optimal performance.
  • This technology offers a promising solution for visual oxygen indication in smart food packaging applications.