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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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The first-order absorption model for extravascular administration describes the rate at which a drug is absorbed and eliminated, following the principles of first-order kinetics. This model is vital as it provides a mathematical representation of drug behavior within the body. It also allows for the prediction and interpretation of drug absorption and elimination based on the rate of change in drug concentration over time. This model can be visualized as a plasma concentration-time profile...
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Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
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Methods for Studying Drug Absorption: In situ01:09

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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
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Evaluation of Drug Sorption to PVC- and Non-PVC-based Tubes in Administration Sets Using a Pump
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Modelado de Gran Angular de la Absorción de Fármacos en PVC Plasticizado

Meriem Sahnoune Millot1, Julien Devémy1, Philip Chennell2

  • 1Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France.

Journal of chemical theory and computation
|February 23, 2026
PubMed
Resumen

Las pérdidas de fármacos durante las infusiones médicas se reducen al comprender cómo interactúan los fármacos con los dispositivos médicos de plástico (PVC). Este estudio utiliza simulaciones avanzadas para modelar la absorción de fármacos, mejorando la seguridad y eficacia de la terapia de infusión.

Palabras clave:
absorción de fármacosPVC plasticizadomodelado de gran angularsimulación moleculardispositivos médicosterapia de infusión

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Área de la Ciencia:

  • Química computacional y ciencia de materiales
  • Ciencias farmacéuticas y administración de fármacos

Sus antecedentes:

  • Las pérdidas de fármacos durante las infusiones intravenosas son un problema importante, a menudo causadas por la adsorción y absorción de fármacos en dispositivos médicos.
  • El PVC plasticizado es un material común en dispositivos médicos, pero su interacción con las formulaciones de fármacos no se comprende completamente a nivel molecular.
  • Los métodos de simulación molecular existentes luchan por capturar las escalas de tiempo y longitud requeridas para estudiar los procesos de absorción de fármacos en polímeros.

Objetivo del estudio:

  • Extender la comprensión molecular de las interacciones fármaco-polímero utilizando un marco de simulación de gran angular.
  • Investigar la absorción de fármacos dentro de matrices de PVC plasticizado que contienen plastificantes DEHT o TOTM.
  • Desarrollar un marco computacional transferible para modelar las interacciones fármaco-polímero en escalas de tiempo extendidas.

Principales métodos:

  • Se utilizó el marco de gran angular Martini 3 para modelar la absorción de fármacos en PVC plasticizado.
  • Se empleó un enfoque de arriba hacia abajo para refinar las interacciones intermoleculares, optimizando las interacciones no enlazadas soluto-agua y soluto-PVC frente a los datos experimentales de partición.
  • Se combinaron el potencial de fuerza media (PMF), la razón de aceptación de Bennett (BAR) y las simulaciones de equilibrio prolongado para analizar los aspectos termodinámicos y cinéticos de la sorción de fármacos.

Principales resultados:

  • Se modeló con éxito la absorción de fármacos dentro de matrices de PVC plasticizado, proporcionando información sobre los mecanismos moleculares subyacentes.
  • Se cuantificaron los parámetros termodinámicos y cinéticos que rigen la sorción de fármacos en el polímero.
  • Se estableció un modelo refinado de gran angular transferible a diversos sistemas de fármacos y polímeros.

Conclusiones:

  • El marco de gran angular desarrollado permite el modelado preciso de las interacciones fármaco-polímero en escalas de tiempo relevantes.
  • Este enfoque cierra la brecha entre las simulaciones atomísticas y las observaciones experimentales de la pérdida de fármacos durante las infusiones.
  • El estudio allana el camino para simular sistemas de infusión completos, incluidas formulaciones complejas y excipientes, para optimizar la administración de fármacos.