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Related Concept Videos

Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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 employed to...
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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
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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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Related Experiment Video

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Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study
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Transport Properties of Ibuprofen Encapsulated in Cyclodextrin Nanosponge Hydrogels: A Proton HR-MAS NMR Spectroscopy Study

Published on: August 15, 2016

Physicochemical perspective of cyclodextrin nano and microaggregates.

Pradipta Purkayastha1, Syed S Jaffer, Prasun Ghosh

  • 1Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741252, WB, India. pradiptp@gmail.com

Physical Chemistry Chemical Physics : PCCP
|March 20, 2012
PubMed
Summary

Supramolecular chemistry explores host-guest interactions using cyclodextrins. This study details cyclodextrin nanoaggregate formation, thermodynamics, and guest-induced morphology changes, primarily via spectroscopy.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Area of Science:

  • Supramolecular Chemistry
  • Host-Guest Chemistry
  • Physical Chemistry

Background:

  • Supramolecular chemistry, or "chemistry beyond the molecule," relies on molecular recognition.
  • Cyclodextrins are prominent hosts due to their solubilization and biocompatibility.
  • Host-guest chemistry is central to supramolecular studies.

Purpose of the Study:

  • Revisit host-guest aspects of cyclodextrins from a physicochemical viewpoint.
  • Detail cyclodextrin nanoaggregate formation and applications induced by guest molecules.
  • Analyze thermodynamics and guest concentration effects on aggregate morphology.

Main Methods:

  • Spectroscopic analysis provides key insights.
  • Investigating guest-induced cyclodextrin nanoaggregate formation.
  • Thermodynamic analysis of host-guest interactions.

Main Results:

  • Cyclodextrin nanoaggregate formation is guest-molecule dependent.
  • Thermodynamics govern the self-assembly process.
  • Guest concentration influences aggregate morphology.

Conclusions:

  • Cyclodextrins are versatile hosts for supramolecular applications.
  • Physicochemical properties dictate nanoaggregate behavior.
  • Spectroscopic methods are crucial for understanding these systems.