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Videos de Conceptos Relacionados

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
Colloidal precipitates01:09

Colloidal precipitates

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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Synthesis and Characterization of Supramolecular Colloids
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Estabilidades de encapsulación no covalentes en nanoensamblajes supramoleculares.

Siriporn Jiwpanich1, Ja-Hyoung Ryu, Sean Bickerton

  • 1Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA.

Journal of the American Chemical Society
|August 5, 2010
PubMed
Resumen

Desarrollamos un método de fluorescencia para medir la rapidez con la que las moléculas invitadas se intercambian en nanoensambles. Esto ayuda a evaluar la estabilidad y la posible fuga de los vehículos de entrega de drogas.

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Área de la Ciencia:

  • Se trata de una química supramolecular.
  • Ciencia de los materiales ciencia de los materiales.
  • La biofísica es la biofísica.

Sus antecedentes:

  • Las dinámicas de intercambio de moléculas invitadas en nanoensamblajes son cruciales para la estabilidad del vehículo de administración de fármacos.
  • Las altas tasas de cambio indican una propensión a que los nanoportadores tengan fugas, lo que compromete la administración de medicamentos.
  • Comprender estas dinámicas es clave para diseñar nanocarriers efectivos y estables.

Objetivo del estudio:

  • Desarrollar y presentar un nuevo método para evaluar la dinámica de intercambio de invitados en soluciones acuosas.
  • Para cuantificar la estabilidad de la encapsulación de moléculas invitadas dentro de varios nanoensamblajes.
  • Establecer una técnica confiable para evaluar la integridad de los sistemas de administración de medicamentos.

Principales métodos:

  • Utilizó la transferencia de energía de resonancia de fluorescencia (FRET) como mecanismo de detección central.
  • Empleó FRET para monitorear la cinética de intercambio de moléculas huéspedes lipofílicas.
  • Aplicó el método para analizar la estabilidad de encapsulación en nanogeles poliméricos y nanoensamblajes anfifílicos.

Principales resultados:

  • Se demostró con éxito un enfoque basado en FRET para medir la dinámica de intercambio de huéspedes.
  • Cuantificó los tipos de cambio, proporcionando información sobre la estabilidad de la encapsulación.
  • Validación de la aplicabilidad del método en diferentes tipos de nanoensamblajes.

Conclusiones:

  • El método basado en FRET ofrece una herramienta robusta para evaluar la dinámica de intercambio de invitados en nanoensambles acuosos.
  • Esta técnica es valiosa para evaluar la estabilidad y la posible fuga de los vehículos de suministro de drogas.
  • Los hallazgos contribuyen al desarrollo de sistemas nanocarrier más estables y eficientes para la administración de fármacos.