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Fluorescence quenching in β-cyclodextrin vesicles: membrane confinement and host-guest interactions
Frauke Schibilla1, Linda Stegemann, Cristian A Strassert
1Organic Chemistry Institute and CeNTech, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, D-48149 Münster, Germany. b.j.ravoo@uni-muenster.de.
Summary
Researchers developed fluorescent beta-cyclodextrin vesicles (β-CDV) for studying molecular interactions. These vesicles effectively detect guests through fluorescence quenching, distinguishing binding mechanisms in bilayer membranes.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Physical Chemistry
Background:
- Fluorescent probes are crucial for monitoring molecular interactions.
- Beta-cyclodextrin vesicles (β-CDV) offer a unique platform for host-guest chemistry due to accessible cavities.
- Understanding recognition processes within membrane environments is essential for developing advanced sensors.
Purpose of the Study:
- To create fluorescent β-CDV capable of detecting host-guest interactions at the vesicle surface.
- To investigate the mechanisms of fluorescence quenching by different guest molecules.
- To demonstrate the utility of β-CDV as a model system for studying dynamic processes in bilayer membranes.
Main Methods:
- Preparation of unilamellar β-CDV incorporating a hydrophobic spirobifluorene-based fluorescent dye.
- Fluorescence quenching experiments using various guest molecules (methyl viologen, 4-nitrophenol, adamantane-conjugated 4-nitrophenol).
- Fluorescence lifetime measurements and competition experiments to elucidate quenching mechanisms and binding interactions.
Main Results:
- Fluorescence quenching of the incorporated dye was observed with specific guests, indicating binding.
- Methyl viologen did not quench fluorescence, confirming lack of binding to β-CDV.
- 4-Nitrophenol and its adamantane conjugate quenched fluorescence via different mechanisms, influenced by pH and inclusion complex formation, respectively.
- Competition experiments differentiated between guest diffusion and specific inclusion complexation.
Conclusions:
- The developed fluorescent β-CDV system effectively monitors host-guest interactions within a bilayer membrane.
- Distinct quenching mechanisms were identified, correlating with guest binding affinity and behavior (diffusion vs. complexation).
- This dynamic supramolecular system serves as a versatile model for investigating quenching and recognition in complex membrane environments.
