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Hydrotropy enhances solute solubility through molecular aggregation. Urea derivatives promote nifedipine solubility by forming aggregates, driven by water structure restoration.

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Area of Science:

  • Physical Chemistry
  • Supramolecular Chemistry
  • Solution Chemistry

Background:

  • Hydrotropy describes enhanced solubility of a solute by a high concentration of another. The underlying mechanisms are not fully understood.
  • Urea derivatives are known hydrotropes, but their precise role in solubilizing poorly soluble compounds requires detailed investigation.

Purpose of the Study:

  • To elucidate the molecular mechanism of hydrotropy using urea derivatives (urea, methylurea, ethylurea, butylurea) to solubilize nifedipine.
  • To investigate the structural, dynamic, and energetic factors governing hydrotropic solubilization via molecular dynamics simulations.

Main Methods:

  • Molecular dynamics (MD) simulations were performed on aqueous solutions containing nifedipine and various urea derivatives.
  • Analysis included structural aggregation, hydrogen bonding, dynamic properties, and energetic contributions to understand the solubilization process.

Main Results:

  • Significant nonstoichiometric molecular aggregation was observed between nifedipine and urea derivatives, mirroring the self-aggregation of urea derivatives.
  • Aggregation was driven by the partial restoration of the normal water structure, evidenced by hydrogen bonding and energy analyses.
  • Energetic data confirmed that urea derivatives favor the solubilization of nifedipine, with varying degrees of aggregation across systems.

Conclusions:

  • Hydrotropy mediated by urea derivatives involves molecular aggregation driven by favorable interactions and water structure recovery.
  • The study provides molecular-level insights into the hydrotropic phenomenon, supporting its potential applications in enhancing the solubility of poorly soluble compounds.