von Bueltzingsloewen, Christoph and McEvoy, Aisling K. and McDonagh, Colette and MacCraith, Brian D. and Klimant, Ingo and Krause, Christian and Wolfbeis, Otto S. (2002) Sol-gel based optical carbon dioxide sensor employing dual luminophore referencing for application in food packaging technology. ANALYST, 127 (11). pp. 1478-1483. ISSN 0003-2654
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FLUORESCENCE LIFETIME; OXYGEN; FILM; PHASE; GAS; STRATEGIES; DYE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Nov 2021 10:47 |
| Last Modified: | 15 Nov 2021 10:47 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40683 |
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