Phosphate-selective fluorescent sensing microspheres based on uranyl salophene ionophores

K Wygladacz; Y Qin; W Wroblewski; Eric Bakker

doi:10.1016/j.aca.2008.02.069

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Phosphate-selective fluorescent sensing microspheres based on uranyl salophene ionophores

Journal article

Open access

Peer reviewed

Phosphate-selective fluorescent sensing microspheres based on uranyl salophene ionophores

K Wygladacz, Y Qin, W Wroblewski and Eric Bakker

Analytica Chimica Acta, Vol.614(1), pp.77-84

2008

DOI: https://doi.org/10.1016/j.aca.2008.02.069

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Abstract

phosphate sensor

optical sensors

ionophore

uranyl salophene

microsphere sensors

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 HI-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.

Details

Title: Phosphate-selective fluorescent sensing microspheres based on uranyl salophene ionophores
Authors: K Wygladacz (Author) - Purdue University, United States
Y Qin (Author) - Renmin University of China, People's Republic of China
W Wroblewski (Author) - Warsaw University of Technology, Poland
Eric Bakker (Author) - Curtin University of Technology
Publication details: Analytica Chimica Acta, Vol.614(1), pp.77-84
Publisher: Elsevier BV
Date published: 2008
DOI: 10.1016/j.aca.2008.02.069
ISSN: 0003-2670
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450382602621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Analytical