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Updated: May 15, 2025
08:17
Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
Published on: July 4, 2011
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Imidazo-phenanthroline based ratiometric optical sensing platform for cyanide and fluoride ions
Nidhi Goswami1, Sudhanshu Naithani1, Jimmy Mangalam1
1Department of Chemistry, School of Engineering, UPES Dehradun 248007, Uttarakhand, India.
Summary
A new fluorescent probe detects toxic fluoride and cyanide ions with high sensitivity. This probe is useful for environmental monitoring and biological imaging, offering a reliable method for anion detection.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Chemical Sensing
Background:
- Fluoride (F-) and cyanide (CN-) ions pose significant environmental and health risks due to their toxicity and widespread presence.
- Efficient and reliable detection methods for these hazardous anions are crucial for environmental monitoring and safety.
Purpose of the Study:
- To develop a novel fluorogenic probe for the selective and sensitive detection of fluoride and cyanide ions.
- To investigate the probe's performance in semi-aqueous media and its practical application using paper-based sensing strips.
- To explore the probe's utility in environmental samples and biological imaging.
Main Methods:
- Synthesis and characterization of an imidazo-phenanthroline based fluorogenic probe (L).
- Spectroscopic analysis (fluorescence spectroscopy) to study the probe's response to F- and CN-.
- Job's plot, NMR, and DFT analyses to elucidate the binding mechanism.
- Development of paper-based sensing strips for practical detection.
- Application testing in soil samples and live MCF-7 cell lines.
Main Results:
- The probe L exhibited a pronounced ratiometric fluorescence response to F- and CN- via hydrogen bonding and deprotonation.
- Selective detection of CN- was achieved with a distinct color change and a nanomolar detection limit.
- Paper-based sensing strips successfully detected F- and CN- under UV light.
- The probe demonstrated high sensitivity and selectivity, confirmed by mechanistic studies.
- Successful application in detecting F- and CN- in soil samples and F- in live cells.
Conclusions:
- The developed imidazo-phenanthroline based probe (L) offers a sensitive, selective, and versatile platform for detecting fluoride and cyanide ions.
- The probe's ability to function in semi-aqueous media and on paper-based strips enhances its practical applicability for environmental and biological sensing.
- This work provides a valuable tool for monitoring toxic anions in complex matrices.
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