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Highly selective potentiometric sensor for determining phenazopyridine hydrochloride in biological fluids using N, N′-(pyromellitoyl)-bis-l-tyrosine dimethyl ester

Authors: Ali A Ensafi, Shadpour Mallakpour, Fatemeh Doozandeh, Ali R Allafchian, Farhang Tirgir
Publication date: 2010/11/23
Journal name: Analytical Letters
Volume: 43
Pages: 2848-2858
Publisher: Taylor & Francis Group
A new membrane selective electrode based on the potentiometric method was developed
for the determination of phenazopyridine. The membrane signal is based on the interaction
of N, N′-(pyromellitoyl)-bis-L-tyrosine dimethyl ester with phenazopyridine. The sensor
displays a linear response with a slope of 61.1 mV decade− 1 for phenazopyridine
concentrations in the range of 1.0× 10− 2–1.0× 10− 5 mol L− 1 and with detection limit of
8.0× 10− 6 mol L− 1 of phenazopyridine. The electrode enjoys a fast response time. ...

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