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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

467
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
467
Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Drug Absorption Mechanism: Passive Membrane Transport01:23

Drug Absorption Mechanism: Passive Membrane Transport

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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Related Experiment Video

Updated: Jul 3, 2025

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Salt-Induced Diffusion of Star and Linear Polyelectrolytes within Multilayer Films.

Aliaksei Aliakseyeu1, Parin Purvin Shah1, John F Ankner2

  • 1Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843, United States.

Macromolecules
|February 15, 2024
PubMed
Summary
This summary is machine-generated.

Salt concentration significantly impacts polyelectrolyte diffusion in layer-by-layer films. Star-shaped polymers show lower mobility at low salt but higher mobility at high salt compared to linear polymers.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Layer-by-layer (LbL) films are versatile materials with tunable properties.
  • Understanding polyelectrolyte diffusion within LbL films is crucial for their application.
  • Molecular architecture influences polymer behavior in confined environments.

Purpose of the Study:

  • To investigate the effect of salt concentration on polyelectrolyte diffusivity in LbL films.
  • To compare the diffusion behavior of linear and star-shaped polyelectrolytes.
  • To correlate molecular architecture with salt-induced changes in polymer mobility.

Main Methods:

  • Synthesis of linear, 4-arm, 6-arm, and 8-arm poly(methacrylic acids) (PMAA) via atom transfer radical polymerization.
  • Assembly of PMAA with poly[2-(trimethylammonium)ethyl methacrylate chloride] (QPC) into LbL films.
  • Neutron reflectivity (NR) to measure perpendicular diffusion and fluorescence recovery after photobleaching (FRAP) for parallel diffusion.

Main Results:

  • Neutron reflectivity revealed a ~10-fold increase in polycation mobility for 8-arm PMAA/QPC films in 0.25 M NaCl compared to linear PMAA/QPC films.
  • FRAP experiments showed star PMAAs diffused slower than linear PMAA below ~0.22 M NaCl.
  • A crossover in mobility was observed, with star polymers exhibiting higher diffusion rates in more concentrated salt solutions.

Conclusions:

  • The molecular architecture of polyelectrolytes significantly affects their diffusion dynamics in LbL films under varying salt conditions.
  • Star-shaped polymers exhibit a more pronounced response to salt concentration changes compared to linear polymers.
  • Findings provide insights into theories governing polyelectrolyte diffusion in multilayered systems and coacervates.