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Stearic acid solubility and cubic phase volume.

Walter F Schmidt1, Justin R Barone, Barry Francis

  • 1Animal and Natural Resources Institute, Beltsville Agricultural Research Center, ARS, USDA, Beltsville, MD 20705, United States. schmidtw@ba.ars.usda.gov

Chemistry and Physics of Lipids
|April 18, 2006
PubMed
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Stearic acid solubility is explained by how it packs with solvent molecules in a cubic volume. Temperature and solvent structure significantly impact this packing and solubility.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Physics

Background:

  • Stearic acid (SA) exhibits high solubility across diverse solvents.
  • Understanding SA solubility requires examining its molecular packing within solvents.
  • Previous studies have not fully elucidated the role of solvent structure and temperature on SA aggregation and solubility.

Purpose of the Study:

  • To elucidate the stoichiometric relationship between stearic acid and solvent molecules within a defined cubic volume.
  • To investigate the influence of temperature and solvent structure on the packing efficiency and stability of stearic acid aggregates.
  • To correlate molecular packing dynamics with the observed solubility of stearic acid in various solvents.

Main Methods:

  • Utilized a (24.8 A)3 cubic volume model to analyze stearic acid/solvent packing.

Related Experiment Videos

  • Investigated solubility at multiple temperatures in structurally diverse solvents.
  • Employed molecular mechanics calculations to assess van der Waals stabilization energies.
  • Analyzed the effect of solvent molecular structure and temperature on SA aggregation.

    • Main Results:

    • Stearic acid solubility is dictated by SA/solvent packing within a cubic volume, varying with temperature and solvent type.
    • At 55°C, SA occupied half the cubic volume in saturated solutions; lowering temperature decreased SA volume fraction by half every 6°C.
    • Molecular mechanics confirmed SA/SA and SA/solvent affinities contribute to stabilization, with packing efficiency dependent on solvent bulkiness and structure.
    • Acetonitrile's rod-like structure disrupted SA packing, leading to lower solubility, while methanol's effect varied with temperature.

    Conclusions:

    • The packing efficiency and stability of stearic acid and solvent molecules within cubic volumes are optimal at specific configurations.
    • SA/solvent interactions and molecular packing within cubic phases explain SA solubility across different conditions.
    • The principles governing SA aggregation and dispersion in cubic phases may extend to more complex lipids and macromolecular systems.