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Probing the binding dynamics to sodium cholate aggregates using naphthalene derivatives as guests
Olga Rinco1, Marie-Christine Nolet, Robyn Ovans
1Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC, Canada V8W 3V6.
Summary
This study investigated how naphthalene derivatives bind to bile salt aggregates. Different derivatives showed distinct binding behaviors and dynamics, influenced by aggregate structure and polarity.
Area of Science:
- Supramolecular Chemistry
- Physical Chemistry
- Biophysical Chemistry
Background:
- Bile salts form aggregates that can encapsulate guest molecules.
- Understanding guest-aggregate interactions is crucial for drug delivery and molecular recognition.
- Naphthalene derivatives serve as model compounds for studying binding dynamics.
Purpose of the Study:
- To elucidate the binding dynamics of naphthalene derivatives with varying polarities to bile salt aggregates.
- To characterize the binding sites and accessibility of guests within these aggregates.
- To investigate the influence of aggregate structure on complexation kinetics.
Main Methods:
- Fluorescence spectroscopy to determine binding site nature and guest accessibility.
- Laser flash photolysis to study triplet state mobility between aggregates and aqueous phases.
- Utilized sodium cholate as the bile salt model system.
Main Results:
- Primary aggregates, offering high protection, bind less polar ethylnaphthalenes with slow dynamics.
- Secondary aggregates, with moderate protection, bind more polar naphthyl-ethanols and acetonaphthones with faster dynamics.
- Salt addition affected primary aggregate formation but not secondary aggregate formation.
Conclusions:
- Bile salt aggregate structure dictates binding affinity and dynamics for naphthalene derivatives.
- Polarity of guest molecules is a key factor in determining binding site within aggregates.
- These findings provide insights into molecular encapsulation within self-assembled systems.