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Theoretical Basis for Refractive Index Changes Resulting from Solution Phase Molecular Interaction.

Michael N Kammer1, Amanda K Kussrow1, Darryl J Bornhop1

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Summary
This summary is machine-generated.

Refractive index (RI) sensing accurately quantifies chemical and biochemical interactions in solution. This study refines RI sensing theory, predicting detectable changes from binding events and confirming them experimentally.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Chemical Sensing

Background:

  • Refractive index (RI) is a key optical property for material characterization.
  • Solution-phase chemical and biochemical interactions require precise sensing methods.
  • Previous work established a foundation for RI sensing.

Purpose of the Study:

  • To refine the theoretical framework for refractive index sensing in solution-phase interactions.
  • To derive a first-principles relationship for RI signals from chemical binding.
  • To investigate the impact of binding-induced conformational and hydration changes on RI.

Main Methods:

  • Utilized the Clausius-Mossotti relation for theoretical derivation.
  • Modeled binding-induced changes in dielectric properties and polarizability.
  • Investigated Ca2+ with Recoverin and benzenesulfonamide with carbonic anhydrase 2 (CAII) interactions.
  • Compared theoretical predictions with empirical observations.

Main Results:

  • Developed a theory predicting quantifiable RI changes (ΔRI) detectable by current instruments.
  • Demonstrated that even small changes in binding-induced polarizability yield measurable RI signals.
  • Observed a surprising decrease in ΔRI for the benzenesulfonamide-CAII interaction, attributed to shielding and water displacement.
  • Empirical data confirmed theoretical predictions.

Conclusions:

  • The refined RI sensing framework accurately predicts and explains RI changes during binding events.
  • The approach is generalizable to various binding systems and conformational changes.
  • Solution-phase RI sensing offers a versatile tool for exploring biological and chemical processes.