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    Phosphate-selective fluorescent sensing microspheres based on uranyl salophene ionophores

    20846_20846.pdf (178.5Kb)
    Access Status
    Open access
    Authors
    Wygladacz, K.
    Qin, Y.
    Wroblewski, W.
    Bakker, Eric
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wygladacz, Katarzyna and Qin, Yu and Wroblewski, Wojciech and Bakker, Eric. 2008. Phosphate-selective fluorescent sensing microspheres based on uranyl salophene ionophores. Analytica Chimica Acta. 614 (1): 77-84.
    Source Title
    Analytica Chimica Acta
    DOI
    10.1016/j.aca.2008.02.069
    Faculty
    Nanochemistry Research Centre
    School
    Nanochemistry Research Institute (Research Institute)
    Remarks

    NOTICE: This is the author’s version of a work that was accepted for publication in Analytica Chimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Analytica Chimica Acta, Vol. 614, Issue 1, (2008). doi: http://doi.org/10.1016/j.aca.2008.02.069

    Copyright 2008 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/37301
    Collection
    • Curtin Research Publications
    Abstract

    Optical dihydrogen phosphate-selective sensors that function on the basis of bulk optode principles and are based on two different uranyl salophene ionophores are reported here for the first time. The influence of the optode composition and measuring conditions such as sample pH on the optode response are characterized, along with sensor selectivity and long-term stability. Three plasticizers of different polarity are considered for optode fabrication: bis(2-ethylhexyl)sebacate (DOS), dodecyl 2-nitrophenyl ether (o-NPDDE), o-nitrophenyloctylether (o-NPOE). The compounds 9-(diethylamino)-5-(octadecanoylimino)-5H-benzo[a]phenoxazine (ETH 5294, chromoionophore I) and 9-(diethylamino)-5-[(2-octyldecyl)imino]benzo[a]phenoxazine (ETH 5350, chromoionophore III) are used as H+-selective fluoroionophores that also act as reference ionophores. The resulting optode-based sensors are compared with their ion-selective electrode (ISE) counterparts, and it is revealed that optodes are better suited for operation at physiological pH. The best optode performance was found for the two component optode sensors doped with ETH 5350 and phosphate ionophore(I). The linear range of these sensor was log a = −6.0 to −2.6. Dihydrogen phosphate-selective optode sensors of optimized composition are fabricated in microsphere format and preliminary measurements in diluted sheep blood samples are presented.

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