Colorimetric Detection of Oxygen in Food Packaging

We present a simple method to monitor the oxygen (O2) concentration within food packages based on a UV resettable colorimetric indicator. The basis is a material combination of the redox color dye methylene blue (MB) with a titanium dioxide (TiO2) nanopowder and glycerol. The work comprises different paste approaches suitable for screen printing and discusses the influencing factors to achieve the desired sensor properties based on investigations in an application-related scenario.