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Aerosol Fluorescent Labeling via Probe Molecule Volatilization.
Angel M Gibbons1, Michael Boadu1, Paul E Ohno1
1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States.
Analytical Chemistry
|December 4, 2024
Summary
Researchers developed a new method to study aerosol properties using fluorescence. This technique allows labeling of particles without pre-mixing, enabling analysis of respiratory and atmospheric aerosols.
Area of Science:
- Aerosol science
- Analytical chemistry
- Spectroscopy
Background:
- Physicochemical properties of aerosols are crucial for various applications.
- Measuring these properties is challenging due to particle size and density.
- Fluorescence probe spectroscopy is a powerful in situ technique, but limited by pre-mixing requirements.
Purpose of the Study:
- To develop a novel method for fluorescent labeling of aerosols via probe molecule volatilization.
- To overcome limitations of pre-mixing in fluorescence probe spectroscopy for aerosol analysis.
- To enable in situ characterization of respiratory and atmospheric aerosols.
Main Methods:
- Developed a volatilization-based method for aerosol fluorescent labeling.
- Utilized polarity-sensitive probes (Nile red and Prodan) for labeling polyethylene glycol (PEG) aerosols.
- Validated the method by comparing fluorescence emission of prelabeled and volatilized-probe PEG particles.
Main Results:
- Successfully labeled model PEG aerosols using probe molecule volatilization.
- Demonstrated the method's validity through consistent relative humidity-dependent fluorescence.
- Preliminary application showed indication of hygroscopicity in artificial saliva and secondary organic aerosols.
Conclusions:
- The developed volatilization method enables fluorescent labeling of aerosols without pre-mixing.
- This technique expands the applicability of fluorescence probe spectroscopy to challenging aerosol types.
- Paves the way for studying exhaled and natural aerosols where prelabeling is not feasible.
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