Al-Qaysi, Wafaa Waleed and Duerkop, Axel (2018) A luminescent europium complex for wide-range pH sensors and sensor microtiterplates. ANALYST, 143 (13). pp. 3176-3183. ISSN 0003-2654, 1364-5528
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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 pK(a) 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ACID; ACIDIFICATION; MEMBRANE; GROWTH; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 19 Mar 2020 14:07 |
| Last Modified: | 19 Mar 2020 14:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14252 |
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