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Interactions of anesthetics with the water-hexane interface. A molecular dynamics study
C Chipot1, M A Wilson, A Pohorille
1Exobiology Branch, NASA-Ames Research Center, Moffett Field, California 94035-1000, USA.
The Journal of Physical Chemistry. B
|January 30, 1997
Summary
Molecular dynamics simulations reveal that solute interfacial solubility strongly correlates with anesthetic potency, even when traditional oil solubility predictions fail. This finding offers new insights into anesthetic mechanisms at interfaces.
Area of Science:
- Physical Chemistry
- Computational Chemistry
- Biophysics
Background:
- Understanding solute behavior at interfaces is crucial for various chemical and biological processes.
- Anesthetic potency is often linked to lipid solubility, but mechanisms at interfaces remain complex.
Purpose of the Study:
- To calculate free energy profiles for solute transfer across liquid-vapor and liquid-liquid interfaces.
- To investigate the relationship between interfacial solubility and anesthetic potency for various halogenated compounds.
Main Methods:
- Molecular dynamics simulations were employed to compute free energy profiles.
- Calculated solvation free energies and surface excess concentrations were compared with experimental data for validation.
Main Results:
- Simulations accurately reproduced experimental free energies of solvation and surface excess concentrations.
- Polar solutes showed significant interfacial minima in free energy profiles at the water-hexane interface.
- Interfacial solubilities correlated well with anesthetic potencies, outperforming oil solubility predictions.
Conclusions:
- The balance between solute-solvent interactions and cavity formation work governs interfacial behavior.
- Interfacial solubility is a key determinant of anesthetic potency, providing a more accurate predictor than bulk oil solubility.