Long-lifetime green-emitting Tb3+ complexes for bacterial staining
Weronika Rochowiak A , Ewa Kasprzycka A C , Israel P. Assunção A D , Ulrich Kynast A * and Marina Lezhnina B *A Muenster University of Applied Sciences, Institute for Optical Technologies, Stegerwaldstr. 39, 48565 Steinfurt, Germany.
B Quantum Analysis GmbH, Mendelstraße 17, 48149 Münster, Germany.
C Present address: Faculty of Chemistry, University of Wroclaw, 14 F Joliot-Curie Street, 50-383 Wroclaw, Poland.
D Present address: Instituto Federal de Ciência e Tecnologia (IFSP), Campus Suzano, Avenue Mogi das Cruzes, 1501 Parque Suzano, Suzano, SP, Brazil.
Handling Editor: George Koutsantonis
Australian Journal of Chemistry 75(9) 754-759 https://doi.org/10.1071/CH21315
Submitted: 1 December 2021 Accepted: 18 February 2022 Published: 18 May 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
The present report describes a new approach to stain bacteria by means of rare earth complexes. We demonstrate with selected Gram-negative and positive bacteria (Escherichia coli, Micrococcus luteus, Bacillus megaterium) that these microbes can be stained efficiently with derivatives of N-phenylanthranilic acid, flufenamic acid in particular, and Tb3+ ions. Hence, the inherent advantages of rare earth complexes, e.g. strong optical absorption (>50 000 L × M−1 × cm−1) due to the antenna effect, large Stokes’ shifts (~10 000 cm−1) and very long emission decay times (millisecond range), and, not least, enhanced photostability can be fully exploited in fluorescence microscopy and spectroscopy of the bacteria; foreseeably, these findings will also be useful in flow cytometry and ELISA techniques.
Keywords: bacteria, fluorescence microscopy, lifetime, luminescence, rare earth complexes, staining.
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