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Kosmotropes and chaotropes: modelling preferential exclusion, binding and aggregate stability.

Susanne Moelbert1, B Normand, Paolo De Los Rios

  • 1Institut de théorie des phénoménes physiques, Ecole polytechnique fédérale de Lausanne, CH-1015 Lausanne, Switzerland.

Biophysical Chemistry
|October 27, 2004
PubMed
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Kosmotropic cosolvents stabilize hydrophobic particle aggregates by enhancing water structure, while chaotropic cosolvents destabilize them by disrupting water structure. This study explains these effects using a modified water model and simulations.

Area of Science:

  • Physical Chemistry
  • Solution Chemistry
  • Biophysical Chemistry

Background:

  • Cosolvents significantly alter the solubility and aggregation behavior of hydrophobic solutes in aqueous solutions.
  • Understanding these cosolvent effects is crucial for various applications, including drug formulation and protein folding studies.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which kosmotropic and chaotropic cosolvents influence the aggregation of hydrophobic particles.
  • To provide a theoretical framework for predicting cosolvent effects on hydrophobic interactions.

Main Methods:

  • An adapted two-state Muller-Lee-Graziano model for water was employed to describe the ternary water/cosolvent/solute system.
  • Monte Carlo simulations were utilized to investigate molecular-level interactions and preferential exclusion/binding phenomena.

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Main Results:

  • Kosmotropic cosolvents enhance water structure, leading to preferential exclusion of cosolvents and solutes, thus stabilizing aggregates.
  • Chaotropic cosolvents disrupt water structure, are preferentially excluded from solution, and promote solvation of hydrophobic particles.
  • Simulations confirmed the molecular basis for cosolvent-induced changes in hydrophobic interactions, with sodium chloride (kosmotropic) and urea (chaotropic) serving as model examples.

Conclusions:

  • The study provides a molecular-level understanding of how cosolvents modulate hydrophobic interactions through their effects on water structure.
  • The findings highlight the importance of water structure in determining the behavior of hydrophobic solutes in the presence of cosolvents.
  • The theoretical model and simulation approach offer a valuable tool for predicting and controlling solute aggregation in complex solutions.