AI Article Synopsis
- An optical sensor has been developed for measuring carbon dioxide in Modified Atmosphere Packaging using a fluorescent pH indicator called HPTS embedded in a silica matrix.
- The sensor employs a Dual Luminophore Referencing (DLR) scheme to measure fluorescence, allowing for high resolution and stability while minimizing interference from oxygen.
- It shows significant performance characteristics, such as a phase shift of 13.5 degrees across CO2 concentrations, a detection limit of 0.08%, and stability over seven months, aligning well with standard CO2 analysis methods.
Article Abstract
An optical sensor for the measurement of carbon dioxide in Modified Atmosphere Packaging (MAP) applications has been developed. It is based on the fluorescent pH indicator 1-hydroxypyrene-3,6,8-trisulfonate (HPTS) immobilised in a hydrophobic organically modified silica (ormosil) matrix. Cetyltrimethylammonium hydroxide was used as an internal buffer system. Fluorescence is measured in the phase domain by means of the Dual Luminophore Referencing (DLR) sensing scheme which provides many of the advantages of lifetime-based fluorometric sensors and makes it compatible with established optical oxygen sensor technology. The long-term stability of the sensor membranes has been investigated. The sensor displays 13.5 degrees phase shift between 0 and 100% CO2 with a resolution of better than 1% and a limit of detection of 0.08%. Oxygen cross-sensitivity is minimised (0.6% quenching in air) by immobilising the reference luminophore in polymer nano-beads. Cross-sensitivity towards chloride and pH was found to be negligible. Temperature effects were studied, and a linear Arrhenius correlation between ln k and 1/T was found. The sensor is stable over a period of at least seven months and its output is in excellent agreement with a standard reference method for carbon dioxide analysis.
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