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Related Concept Videos

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Intercalant Aggregation Promotes Nanoscopic Depletion in Droplet Interface Bilayers.

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Hydrophobic molecules influence lipid bilayer properties. Crystallizable molecules like naphthalene are excluded, thinning membranes, while smaller ones like n-decane increase thickness.

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Area of Science:

  • Membrane biophysics
  • Lipid bilayer dynamics
  • Molecular interactions

Background:

  • Free volume in lipid bilayers is critical for membrane properties like fluidity and permeability.
  • Hydrophobic molecules within bilayers affect free volume, and their solidification can lead to bilayer thinning.
  • Understanding these interactions is key to modulating membrane functions.

Purpose of the Study:

  • To investigate the inclusion and exclusion behaviors of various hydrocarbon intercalants within lipid bilayers.
  • To quantify the impact of these intercalants on bilayer thickness.
  • To elucidate the relationship between intercalant properties and their effect on membrane structure.

Main Methods:

  • Quantification of lipid bilayer thickness.
  • Analysis of hydrocarbon intercalant behavior (inclusion/exclusion).
  • Investigating the effects of molecular size, chain length, and crystallizability.

Main Results:

  • Long-chain squalane was expelled due to excluded volume effects.
  • Smaller intercalants (n-decane, p-xylene, tetralin) were incorporated, increasing bilayer thickness.
  • Crystallizable intercalants (naphthalene, durene) were excluded, causing bilayer thinning via depletion forces.

Conclusions:

  • Bilayer thickness and free volume are modulated by the inclusion or exclusion of hydrophobic molecules.
  • The crystallizability and size of intercalants dictate their behavior within the bilayer.
  • Findings advance fundamental understanding of biological membranes and inform synthetic membrane design.