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Molecular interactions in binary solids: crystal structure of a cholesteryl ester solid solution.

D L Dorset1, W A Pangborn

  • 1Medical Foundation of Buffalo, Inc., NY 14203.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 1992
PubMed
Summary

This study details the crystal structure of a cholesteryl ester solid solution, revealing extended fatty acid chains without significant disorder. The findings align with predictions for binary cholesterol ester mixtures.

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Area of Science:

  • Crystallography
  • Materials Science
  • Biochemistry

Background:

  • Cholesteryl esters are crucial in biological systems and materials science.
  • Understanding the solid-state structure of mixed cholesteryl esters is key to their properties.

Purpose of the Study:

  • To determine the x-ray crystal structure of a binary solid solution of cholesteryl undecanoate and cholesteryl laurate.
  • To investigate the packing and conformational behavior of mixed cholesteryl esters in the solid state.

Main Methods:

  • X-ray crystal structure analysis was performed on a solid solution (0.52/0.48 molar ratio).
  • Unit cell parameters and space group were determined.
  • Crystal structure was refined using observed reflections.

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Main Results:

  • The unit cell is monoclinic (space group P2(1)) with specific lattice parameters.
  • The d001 spacing conforms to Vegard's law predictions for the mixture.
  • The room-temperature structure resembles cholesteryl laurate monolayer I packing with fully extended fatty acid chains.
  • No significant conformational disorder was observed in the binary solid solution.

Conclusions:

  • The crystal structure analysis provides detailed insights into the solid-state organization of mixed cholesteryl esters.
  • The observed packing suggests a predictable structural behavior in binary cholesterol ester systems.
  • The absence of disorder indicates a stable crystalline arrangement for this specific mixture.