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Europium Ion-Based Magnetic-Trapping and Fluorescence-Sensing Method for Detection of Pathogenic Bacteria.
Analytical Chemistry 2024 March 26
Europium ions (Eu3+ ) have been utilized as a fluorescence-sensing probe for a variety of analytes, including tetracycline (TC). When Eu3+ is chelated with TC, its fluorescence can be greatly enhanced. Moreover, Eu3+ possesses 6 unpaired electrons in its f orbital, which makes it paramagnetic. Being a hard acid, Eu3+ can chelate with hard bases, such as oxygen-containing functional groups (e.g., phosphates and carboxylates), present on the cell surface of pathogenic bacteria. Due to these properties, in this study, Eu3+ was explored as a magnetic-trapping and sensing probe against pathogenic bacteria present in complex samples. Eu3+ was used as a magnetic probe to trap bacteria such as Staphylococcus aureus , Escherichia coli , Enterococcus faecalis , Acinetobacter baumannii , Bacillus cereus , and Pseudomonas aeruginosa . The addition of TC facilitated the easy detection of magnetic Eu3+ -bacterium conjugates through fluorescence spectroscopy, with a detection limit of approximately ∼104 CFU mL-1 . Additionally, matrix-assisted laser desorption/ionization mass spectrometry was employed to differentiate bacteria tapped by our magnetic probes.
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