Microwave-assisted sensing of tetracycline using europium-sensitized luminescence fibers as probes |
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Authors: | Chi-Lap Kuong Tsai-Jung Yu and Yu-Chie Chen |
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Institution: | (1) Department of Applied Chemistry, National Chiao Tung University, Hsinchu, 300, Taiwan; |
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Abstract: | In this paper, we describe a facile approach—using silicate fibers immobilized with Eu(III) ions Eu(III) fibers] as affinity
probes—to rapidly sense tetracycline (TC) in complex samples. The fabrication of the Eu(III) fibers is straightforward: Simply
immerse a silicate fiber into a glass tube containing Eu(III) and irradiate with microwaves (power, 900 W) for 30 s. The Eu(III)
fibers selectively trap TC from aqueous samples via chelation of the β-diketone functional group of TC with the Eu(III) center.
Because the Eu(III)–TC complexes on the fibers are luminescent, as a result of intermolecular energy transfer from the TC
moieties to the Eu(III) centers, they can be detected directly using a fluorophotometer. To accelerate the sensing process,
we also used microwave irradiation (for only 15 s) to trap the TC molecules from the sample solutions onto the Eu(III) fibers.
Furthermore, only a small volume (< 10 μL) of sample solution is required for these analyses. This approach allows TC to be
detected in aqueous samples, with a detection limit of 50 nM. |
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