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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

403
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
403

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Hybrid quantum-classical polarizability model for single molecule biosensing.

Ekaterina Zossimova1,2, Johannes Fiedler3, Frank Vollmer1

  • 1Department of Physics and Astronomy, Living Systems Institute, University of Exeter, EX4 4QD, Exeter, UK. ez216@exeter.ac.uk.

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This summary is machine-generated.

This study explores how solvent effects influence amino acid polarizability for biosensor applications. We developed a model to distinguish amino acids and their ionized forms by their unique polarizability signatures.

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Biosensor Technology

Background:

  • Optical whispering gallery mode biosensors offer single-molecule detection capabilities.
  • Molecular polarizability is key to biosensor sensitivity, but is influenced by the surrounding environment.
  • Amino acids, fundamental biological molecules, exhibit varying polarizabilities.

Purpose of the Study:

  • To investigate factors affecting amino acid polarizability in aqueous solutions.
  • To develop a computational model for predicting amino acid polarizability.
  • To assess the potential for distinguishing amino acids and their ionized conformers using polarizability.

Main Methods:

  • Utilizing electronic structure theory to analyze amino acid polarizability.
  • Investigating solvent effects, including structural changes and protonation.
  • Developing and applying a hybrid quantum-classical model for polarizability calculations.
  • Calculating excess polarizability relative to the displaced water cavity.

Main Results:

  • Solvent effects significantly increase the effective polarizability of amino acids in water.
  • Structural changes, protonation, and local field enhancement contribute to increased polarizability.
  • The developed hybrid model accurately predicts polarizability, showing good agreement with self-consistent calculations.
  • Calculated excess polarizability values for all 20 proteinogenic amino acids were determined.

Conclusions:

  • Understanding solvent-mediated polarizability is crucial for designing sensitive biosensors.
  • The developed model provides a method to differentiate amino acids and their ionized states.
  • This research lays the groundwork for enhanced single-molecule biosensing of biological building blocks.