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Issue 11, 2009
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A highly Li+-selective glass optode based on fluorescence ratiometry

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This paper presents the preparation and characterization of a single-excitation, dual-emission ratiometric optical Li+-sensing device using a newly designed and synthesized highly Li+-selective fluoroionophore (KBL-01) carrying 14-crown-4 ether with tetramethyl and benzene blocking subunits as Li+-binding site and boron-dipyrromethene as fluorophore. The indicator dye was covalently immobilized on the surface of a porous glass support having a large internal surface area using a silane-coupling agent. The resulting Li+-selective glass optode shows dual fluorescence emission response in pseudo-serum at varying Li+ concentrations, allowing ratiometric signal processing. The obtained signal is independent of the presence of possibly interfering cations (Na+, K+, Mg2+ and Ca2+) and pH. The sensor response was found to be reversible within the Li+ concentration range from 10−4 to 10−1 M, and showed good repeatability and light stability. The plots of the ratiometric signal versus the Li+ concentrations in spiked real human serum go along with the response curve in pseudo-serum. These results indicate that the novel Li+-selective glass optode can be employed as a Li+-sensing device with high durability, sensitivity and accuracy for medical analyses.

Graphical abstract: A highly Li+-selective glass optode based on fluorescence ratiometry

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The article was received on 29 Jun 2009, accepted on 09 Sep 2009 and first published on 15 Sep 2009

Article type: Paper
DOI: 10.1039/B912756A
Citation: Analyst, 2009,134, 2314-2319
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    A highly Li+-selective glass optode based on fluorescence ratiometry

    Y. Ando, Y. Hiruta, D. Citterio and K. Suzuki, Analyst, 2009, 134, 2314
    DOI: 10.1039/B912756A

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