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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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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Dynamic and Diverse Coacervate Architectures by Controlled Demembranization.

Yang Zhou1,2, Manfred F Maitz3, Kehu Zhang1

  • 1Division Macromolecular Chemistry, Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, Dresden 01069, Germany.

Journal of the American Chemical Society
|March 26, 2025
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Summary
This summary is machine-generated.

Scientists developed a method to control the membrane formation and removal in coacervate protocells. This breakthrough enables dynamic structural changes and controlled permeability for advanced synthetic cell development.

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Area of Science:

  • Biomimetic chemistry
  • Synthetic biology
  • Protocell development

Background:

  • Cellular membranes regulate biological processes and communication.
  • Biomimetic cell structures mimic cellular dynamics for research.
  • Coacervates offer a platform for creating artificial cellular compartments.

Purpose of the Study:

  • To develop a controlled demembranization strategy for membranized coacervates.
  • To enhance the functionality and dynamic reconfiguration of coacervate protocells.
  • To create advanced synthetic protocells with tunable membrane properties.

Main Methods:

  • Coating membraneless coacervates with terpolymer nanoparticles to form membranes.
  • Inducing demembranization using an anionic polysaccharide via electrostatic competition.
  • Creating bilayer and Janus-like coacervates by adding a polymersome layer.

Main Results:

  • Achieved controlled membranization and demembranization of coacervate droplets.
  • Demonstrated tunable permeability of coacervates to macromolecules and nanoparticles.
  • Successfully fabricated coacervate protocells with hierarchical and asymmetric membrane structures.

Conclusions:

  • The developed method allows precise control over coacervate protocell membrane dynamics.
  • This platform facilitates the creation of synthetic protocells with diverse and dynamic architectures.
  • Enables advanced applications in synthetic biology, systems biology, and biotechnology.