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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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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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Controlar la cristalización farmacéutica con heteronúcleos poliméricos diseñados.

Laura Y Pfund1, Christopher P Price, Jessica J Frick

  • 1Department of Chemistry and the Macromolecular Science and Engineering Program, The University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.

Journal of the American Chemical Society
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Resumen

Los investigadores transformaron los inhibidores de la cristalización en promotores al incorporarlos a los polímeros. Esta innovación acelera significativamente la formación de cristales, ayudando a los compuestos resistentes a la cristalización y mejorando el descubrimiento de formas sólidas.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Ingeniería Química Ingeniería Química.
  • Ciencia de la cristalización Ciencia de la cristalización.

Sus antecedentes:

  • Los inhibidores de la cristalización pueden obstaculizar la formación de cristales deseada.
  • El desarrollo de métodos para controlar la cinética de la cristalización es crucial para el desarrollo farmacéutico y la ciencia de los materiales.
  • La adaptación de aditivos moleculares ofrece una ruta potencial para manipular los procesos de cristalización.

Objetivo del estudio:

  • Investigar si las moléculas que inhiben la cristalización en solución pueden modificarse para promoverla.
  • Para sintetizar nuevos aditivos polimerizables que imitan el acetaminofén y el ácido mefenámico.
  • Para explorar el efecto de la incorporación de estos aditivos en polímeros en el tiempo de inducción de la cristalización.

Principales métodos:

  • Síntesis de aditivos polimerizables diseñados para imitar las estructuras farmacéuticas.
  • Evaluación del rendimiento del aditivo en solución, observando la inhibición selectiva de la cara y el crecimiento de cristales.
  • Incorporación de aditivos en una matriz de polímeros insolubles.
  • Medición del tiempo de inducción de la cristalización para productos farmacéuticos en presencia de aditivos unidos a polímeros.

Principales resultados:

  • Los aditivos sintetizados mostraron una inhibición selectiva de la cara del crecimiento de los cristales en solución, ralentizando la apariencia de los cristales.
  • La incorporación de estos aditivos en un polímero insoluble disminuyó sustancialmente el tiempo de inducción para la formación de cristales de acetaminofén y ácido mefenámico.
  • Los aditivos ligados al polímero actuaron como promotores de la cristalización, contrastando su comportamiento en solución.

Conclusiones:

  • Se pueden sintetizar polímeros hechos a medida para transformar los inhibidores de la cristalización en promotores.
  • Este enfoque reduce efectivamente el tiempo de inducción para la aparición de cristales.
  • El método tiene potencial para el descubrimiento de compuestos resistentes a la cristalización y para mejorar la heteronucleación en forma sólida.