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Issue 13, 2018
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A luminescent europium complex for wide-range pH sensors and sensor microtiterplates

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Abstract

In this work, we show a new concept of a luminescent wide-range pH indicator based on a europium complex and its implementation in sensors and sensor microtiterplates. For this purpose, we complexed europium with the ligands gallic acid (Gall) and pyridine dicarboxylic acid (PDA) that carry groups with wide ranging pKa values and the antenna ligand theonyl trifluoroacetone (TTA). This yields an indicator that overcomes the typical drawbacks of many optical pH indicator dyes which mostly cover three pH units, only. The spectral characterization of the new europium complex Eu3+–TTA–Gall–PDA in a molar ratio of 1 : 3 : 1 : 1 in aqueous buffer delivers a luminescence emission that is dependent on pH over up to 8 orders of magnitude from pH 2–10 in aqueous solution. It was therefore embedded into sensor membranes made of cellulose acetate (CA) which respond reversibly from pH 2–7 over 5 orders of magnitude within several minutes. Moreover, the first high-throughput pH sensor microtiterplate based on this indicator showed a dynamic range from pH 2–8 over 6 orders of magnitude and is suitable for up to 24 h of continuous use.

Graphical abstract: A luminescent europium complex for wide-range pH sensors and sensor microtiterplates

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Publication details

The article was received on 26 Apr 2018, accepted on 21 May 2018 and first published on 22 May 2018


Article type: Paper
DOI: 10.1039/C8AN00775F
Citation: Analyst, 2018,143, 3176-3183
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    A luminescent europium complex for wide-range pH sensors and sensor microtiterplates

    W. Waleed Al-Qaysi and A. Duerkop, Analyst, 2018, 143, 3176
    DOI: 10.1039/C8AN00775F

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