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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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pH-driven colloidal transformations based on the vasoactive drug nicergoline.

Stefan Salentinig1, Kristian J Tangso, Adrian Hawley

  • 1Drug Delivery, Disposition and Dynamics, and §ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus) , 381 Royal Parade, Parkville, VIC 3052, Australia.

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Summary
This summary is machine-generated.

This study shows how nicergoline interacts with nanostructured emulsion particles, creating pH-responsive drug delivery systems. These systems change structure with pH, enabling controlled release of poorly water-soluble drugs.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Pharmaceutical Sciences

Background:

  • Understanding drug-amphiphile interactions is key for designing effective drug delivery systems.
  • Controlling colloidal self-assembled structures allows for targeted or controlled release of poorly water-soluble drugs.

Purpose of the Study:

  • To investigate the interaction between the hydrophobic drug nicergoline and monoglyceride-water based nanostructured emulsion particles.
  • To characterize the resulting pH-responsive colloidal structures and their phase behavior.

Main Methods:

  • Small-angle X-ray scattering (SAXS) to analyze colloidal structure.
  • Cryogenic transmission electron microscopy (cryo-TEM) for visualization.
  • pH-dependent characterization of the drug-nanoparticle system.

Main Results:

  • Nicergoline addition modified the internal bicontinuous cubic structure.
  • pH-responsive transformations were observed: inverse micelles (high pH), vesicles (low pH), and altered cubic spacing (intermediate pH).
  • In situ determination of the drug's apparent pKa was achieved.

Conclusions:

  • The interaction generates novel pH-responsive nanostructured systems.
  • This phase behavior is valuable for designing controlled release systems for hydrophobic drugs.
  • The study offers a method for determining drug pKa in complex colloidal systems.