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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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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
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Nanopartículas poliméricas de drogas diméricas con una carga de drogas excepcionalmente alta y una eficiencia de

Kaimin Cai1, Xi He1,2, Ziyuan Song1

  • 1†Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

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|March 6, 2015
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Resumen

Los investigadores desarrollaron una nueva estrategia para crear nanopartículas poliméricas (NP) con más del 50% de carga de fármaco y eficiencia cuantitativa. Este avance utiliza un núcleo de conjugado de fármaco dimérico para mejorar los sistemas de administración de fármacos.

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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Entrega de drogas Envío de drogas

Sus antecedentes:

  • Las nanopartículas poliméricas (NP) son ampliamente utilizadas para la encapsulación de fármacos de moléculas pequeñas.
  • Los métodos actuales a menudo sufren de bajas cargas de drogas y eficiencias.
  • Existe la necesidad de formulaciones avanzadas de NP con mejor capacidad de carga útil de fármacos.

Objetivo del estudio:

  • Desarrollar una nueva estrategia para la preparación de NP poliméricos con una carga de fármacos excepcionalmente alta y una eficiencia de carga cuantitativa.
  • Para diseñar un conjugado de fármaco dimérico como una unidad de construcción de núcleo para NPs.
  • Investigar la estabilidad y las características de liberación de los NPs desarrollados.

Principales métodos:

  • Co-precipitación de un conjugado de fármaco dimérico y methoxypoly ((etilenglicol) -bloqueo-polilactido (mPEG-PLA).
  • Formación de NPs con un núcleo de fármaco dimérico y una cáscara de polímero.
  • Evaluación de la carga del fármaco, la eficiencia de carga, la estabilidad en condiciones fisiológicas y la liberación desencadenada del fármaco.

Principales resultados:

  • Se logró una carga de drogas excepcionalmente alta (>50%) y una eficiencia de carga cuantitativa.
  • Se ha demostrado una excelente estabilidad de los NP en condiciones fisiológicas (solución PBS).
  • Se mostró la liberación controlada de la forma de fármaco auténtico tras el disparo externo, sin liberación prematura.

Conclusiones:

  • La estrategia desarrollada permite la preparación de NP poliméricos con una capacidad de carga de fármacos significativamente mejorada.
  • La estrategia de núcleo de fármacos conjugados diméricos ofrece un enfoque prometedor para sistemas de administración de fármacos estables y controlados.
  • Estos NP de alta carga de drogas son adecuados para aplicaciones que requieren una liberación eficiente y desencadenada de agentes terapéuticos.