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Global optimization of cholic acid aggregates.

Balázs Jójárt1, Béla Viskolcz1, Mihalj Poša2

  • 1Department of Chemical Informatics, Faculty of Education, University of Szeged, Boldogasszony sgt. 6, H-6725, Szeged, Hungary.

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|April 17, 2014
PubMed
Summary

Researchers explored bile acid aggregate structures using computational methods. Small cholate clusters form reverse micelles, with larger aggregates showing classical micellar behavior, stabilized by hydrogen bonds, particularly in the decamer.

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Bile acids are being investigated as potential pharmaceutical drug carriers.
  • The structural organization of bile acid aggregates remains poorly understood.
  • Understanding aggregate structure is crucial for optimizing their use in drug delivery.

Purpose of the Study:

  • To determine the lowest energy configurations of cholate molecule clusters (2-10 molecules).
  • To evaluate the relative stabilities of these bile acid aggregates.
  • To elucidate the structural behavior and stability of bile acid aggregates.

Main Methods:

  • Employed global optimization techniques to identify stable cluster geometries.
  • Calculated relative stabilities for various aggregate sizes.
  • Utilized molecular dynamics simulations to assess aggregate dissociation propensity.

Main Results:

  • Small cholate aggregates (2-5 units) favor reverse micellar arrangements.
  • Classical micellar behavior, with hydrophobic core formation, emerges in aggregates larger than five cholate units.
  • Hydrogen bonding is a key stabilizing force, with the decamer (10 units) exhibiting the highest stability and lowest dissociation tendency.

Conclusions:

  • The structure of bile acid aggregates transitions from reverse micelles to classical micelles with increasing size.
  • Hydrogen bonding significantly contributes to the stability of cholate aggregates.
  • The decamer represents the most stable aggregate structure within the studied size range, indicating potential for specific applications.